Impurity removal method for water matrix standard substance

Abstract

The invention relates to the technical field of water treatment, and discloses an impurity removal method for a water matrix standard substance, which comprises the following steps: sequentially pretreating a water matrix to be treated; carrying out electrochemical catalytic oxidation on the pretreated water matrix flow under the action of pulse square wave current; carrying out photocatalytic treatment on the water matrix subjected to electrochemical oxidation under multi-band illumination; gradient separation of volatile and non-volatile impurities of the water matrix after photocatalysis treatment is realized; in an inert atmosphere environment, adding a composite stabilizer into the water matrix subjected to membrane separation, and packaging and sealing; organic carbon, heavy metal and biological activity indexes are monitored in real time through a multispectral coupling technique, and process parameters are dynamically optimized based on a deep reinforcement learning model. The method provided by the invention realizes efficient removal and long-term stable preservation of trace impurities in the water matrix standard substance, and is suitable for the fields of environmental monitoring and chemical analysis.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a method for removing impurities from water matrix standards. Background Technology

[0002] Water-based standards are widely used in environmental monitoring and chemical analysis, and their purity directly affects the accuracy of test results. However, existing technologies have many problems in removing impurities from water-based standards. For example, while traditional microfiltration and depth filtration can remove larger particles, their effectiveness in removing dissolved organic matter and heavy metal ions is limited. Furthermore, although ultraviolet irradiation can decompose some organic matter, it cannot selectively and efficiently degrade specific pollutants and is prone to generating secondary pollutants.

[0003] Electrochemical catalytic oxidation is an effective water treatment technology, but existing methods suffer from low efficiency when treating water-based standards. Traditional electrode materials cannot achieve control over specific crystal planes, resulting in poor selectivity and high energy consumption in the oxidation reaction. Furthermore, impurities easily deposit on the electrode surface, leading to the deactivation of active sites and further reducing treatment efficiency.

[0004] Photocatalysis technology is widely used in water treatment, but existing methods have many problems when treating water-based standards. While traditional metal-organic frameworks (MOFs) possess excellent adsorption properties, they lack responsiveness to specific wavelengths during photocatalysis, resulting in low utilization efficiency of photogenerated carriers. Furthermore, current technologies cannot achieve dynamic control of the photocatalytic pathway, making it difficult to achieve efficient degradation from macromolecules to small molecules.

[0005] Membrane separation technology is widely used in water treatment, but existing methods have many problems when processing water-based standards. Traditional hydrophobic membranes cannot achieve gradient separation of volatile and non-volatile impurities, resulting in low separation efficiency. In addition, existing encapsulation technologies cannot effectively prevent microbial contamination, leading to short shelf life of the standards.

[0006] Therefore, this invention proposes a method for removing impurities from water-based standards, aiming to solve the above-mentioned problems in the prior art and improve the purity and stability of water-based standards. Summary of the Invention

[0007] The purpose of this invention is to propose a method for removing impurities from water-based standard materials, which addresses the problems of low removal rate, poor selectivity, high energy consumption, easy passivation, and short shelf life in the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a method for removing impurities from water-based standard materials, comprising the following steps:

[0009] Step S1: The water matrix to be treated is subjected to cross-flow microfiltration, depth filtration and band-tunable ultraviolet irradiation pretreatment in sequence.

[0010] Step S2 involves passing the pretreated water matrix through a composite metal oxide electrode with crystal plane engineering control, where it undergoes electrochemical catalytic oxidation under the action of a pulsed square wave current.

[0011] Step S3: The electrochemically oxidized water matrix is ​​introduced into an amino-modified metal-organic framework material reactor for photocatalytic treatment under multi-band light irradiation.

[0012] Step S4: The photocatalytically treated water matrix is ​​passed through a composite separation membrane module with a hydrophilic-hydrophobic heterogeneous interface to achieve gradient separation of volatile and non-volatile impurities.

[0013] Step S5: In an inert atmosphere, a composite stabilizer containing nano-metals and organic antioxidants is added to the aqueous matrix after membrane separation and then encapsulated and sealed.

[0014] Step S6 involves real-time monitoring of organic carbon, heavy metals, and bioactivity indicators using multispectral technology, and dynamic optimization of process parameters based on a deep reinforcement learning model.

[0015] Furthermore, step S1 also includes the following sub-steps:

[0016] S1-1, which causes the substrate of the water to be treated to flow tangentially along the surface of the microfiltration membrane. By adjusting the influent flow rate and the return flow rate, a turbulent shear force field is formed on the membrane surface, which continuously strips off and traps particulate pollutants on the membrane surface.

[0017] S1-2, the water matrix after cross-flow microfiltration is passed through three stages of filter media: coarse, medium and fine. The pore gradient difference and surface adsorption between the media are used to achieve the step-by-step separation and removal of suspended particles, colloidal substances and dissolved impurities.

[0018] S1-3 uses ultraviolet light to irradiate the deeply filtered water matrix, and detects the organic composition through online spectral analysis. It automatically adjusts the 200-400nm wavelength combination of the ultraviolet light source to decompose residual pollutants through photochemical action.

[0019] Furthermore, step S2 also includes the following sub-steps:

[0020] S2-1 allows the pretreated water matrix to flow tangentially through the surface of the composite metal oxide electrode. The flow state is controlled by crystal plane engineering to bring the electrolyte into contact with specific active sites on the crystal plane.

[0021] S2-2 uses a pulsed power supply to apply an asymmetric square wave current to the electrolysis system. By synergistically controlling the forward pulse width, reverse pulse amplitude and interval time, hydroxyl radical active species are periodically generated on the electrode surface, and the deposits on the electrode surface are removed through electrochemical reduction.

[0022] S2-3 uses a redox potential sensor to monitor the potential change curve during electrolysis in real time and adjusts the pulse parameters according to the potential change characteristics.

[0023] S2-4 involves continuously adding a buffer solution to the electrolysis system and controlling the dosage through online pH monitoring to stabilize the electrolysis environment within the catalytic activity range.

[0024] Furthermore, step S3 also includes the following sub-steps:

[0025] S3-1 allows the water matrix after electrochemical oxidation to flow over the surface of an amino-modified metal-organic framework material. By controlling the flow rate and flow state, a contact interface is established, allowing pollutant molecules to contact and bind with the amino-modified sites on the material surface.

[0026] S3-2 uses a multi-band combined illumination mode to excite metal-organic framework materials, and utilizes the photocatalytic properties of metal oxide nodes and the photosensitization effect of amino groups to generate active species such as hydroxyl radicals and superoxide radicals.

[0027] S3-3 uses online mass spectrometry to monitor the concentration of intermediate products of benzene rings and carboxylic acids in real time, designs photocatalytic reaction pathways, and adjusts the light intensity and time in stages to achieve the staged removal of pollutants from macromolecular cleavage to small molecule mineralization.

[0028] S3-4: Periodically interrupt the photocatalytic process, inject an oxidizing regeneration solution into the reaction system and mechanically stir it. The passivation layer on the catalyst surface is removed through the synergistic effect of chemical oxidation and physical scouring, restoring the surface active sites.

[0029] Furthermore, step S4 also includes the following sub-steps:

[0030] S4-1, construct a composite separation membrane surface with alternating distribution of hydrophilic and hydrophobic regions at the microscale, and make the hydrophilic region exhibit a contact angle of ≤30° and the hydrophobic region exhibit a contact angle of ≥120° through chemical modification;

[0031] S4-2 allows the photocatalytically treated water matrix to pass through the surface of the composite separation membrane in a tangential flow manner. By utilizing the surface energy difference between the hydrophilic and hydrophobic regions, volatile components are adsorbed in the hydrophobic region, while non-volatile components are enriched in the hydrophilic region.

[0032] S4-3, a temperature gradient field is established on both sides of the membrane module to maintain the hydrophobic region at 50-70℃ to promote the desorption and vaporization of volatile components, and maintain the hydrophilic region at 30-50℃ to enhance the retention of non-volatile components.

[0033] S4-4 controls the mass transfer rate of volatile components by adjusting the transmembrane pressure difference, while optimizing the water flux in the hydrophilic zone, thereby achieving gradient separation of volatile and non-volatile impurities.

[0034] Furthermore, step S5 also includes the following sub-steps:

[0035] S5-1 establishes an inert protective environment in a sealed container through a multi-stage gas replacement process. It uses a large flow of inert gas to replace the air and reduce the oxygen content to below 100 mg / L. Through micro-flow control, the residual oxygen content is kept stable below 10 mg / L.

[0036] S5-2, the membrane separation water matrix and composite stabilizer are simultaneously introduced into the container, and the nano-metal particles are uniformly dispersed by two-way jet mixing technology, while the organic antioxidant forms a molecular protective network;

[0037] S5-3, remove the gas from the top space of the sealed container, complete the sealing process using a hot melt sealing process, and verify the integrity of the seal using mass spectrometry.

[0038] Furthermore, step S6 also includes the following sub-steps:

[0039] S6-1: Real-time acquisition of spectral characteristic signals of water samples through multispectral sensing technology, simultaneous collection of detection data of total organic carbon, heavy metals and bioactivity indicators, and establishment of a mapping relationship model between spectral characteristics and pollutant content to achieve in-situ monitoring of multiple parameters.

[0040] S6-2, construct a dynamic evaluation matrix that includes electrocatalytic oxidation efficiency, photocatalytic degradation rate and membrane flux, and calculate the process parameter optimization scheme through reinforcement learning algorithm. The process parameters include electrocatalytic current density, photocatalytic light intensity and membrane separation transmembrane pressure difference.

[0041] The beneficial effects of the technical solution provided by this invention include at least the following:

[0042] This invention constructs a composite metal oxide electrode with crystal plane engineering control to selectively expose active sites on specific crystal planes, thereby achieving highly efficient electrochemical catalytic oxidation, significantly improving the degradation efficiency of organic pollutants, and reducing energy consumption.

[0043] This invention utilizes amino-modified metal-organic framework materials and combines them with multi-band illumination modes to achieve efficient capture of heavy metal ions and graded degradation of organic pollutants, significantly improving photocatalytic efficiency.

[0044] This invention constructs a composite separation membrane with hydrophilic and hydrophobic heterogeneous interfaces and establishes a temperature gradient field on both sides of the membrane to achieve gradient separation of volatile and non-volatile impurities, thus significantly improving separation efficiency.

[0045] This invention achieves effective inhibition of microbial contamination and significantly extends the shelf life of water-based standards by injecting nano-metal sol and organic antioxidants stepwise under an inert atmosphere and then encapsulating and sealing them. Attached Figure Description

[0046] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flowchart of a method provided in an embodiment of the present invention. Detailed Implementation

[0048] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a method for removing impurities from water-based standard materials according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0050] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0051] The following describes in detail, with reference to the accompanying drawings, a specific scheme for the impurity removal method for water-based standard materials provided by the present invention.

[0052] Please see Figure 1 The diagram illustrates a method flowchart for impurity removal from an aqueous matrix standard according to an embodiment of the present invention, comprising the following steps:

[0053] Step S1: The water matrix to be treated is subjected to cross-flow microfiltration, depth filtration and band-tunable ultraviolet irradiation pretreatment in sequence.

[0054] Step S1 further includes the following sub-steps:

[0055] S1-1, which causes the substrate of the water to be treated to flow tangentially along the surface of the microfiltration membrane. By adjusting the influent flow rate and the return flow rate, a turbulent shear force field is formed on the membrane surface, which continuously strips off and traps particulate pollutants on the membrane surface.

[0056] S1-2, the water matrix after cross-flow microfiltration is passed through three stages of filter media: coarse, medium and fine. The pore gradient difference and surface adsorption between the media are used to achieve the step-by-step separation and removal of suspended particles, colloidal substances and dissolved impurities.

[0057] S1-3 uses ultraviolet light to irradiate the deeply filtered water matrix, and detects the organic composition through online spectral analysis. It automatically adjusts the 200-400nm wavelength combination of the ultraviolet light source to decompose residual pollutants through photochemical action.

[0058] It should be noted that in this embodiment, the water matrix to be treated is derived from a surface water sample. After preliminary filtration, specific target impurities are added to simulate water matrix standards in actual applications.

[0059] The initial water quality parameters of the substrate to be treated include: TOC (Total Organic Carbon): 5.2 mg / L; Cd 2+ (Cadmium ion): 50 μg / L; PFOS (perfluorooctane sulfonic acid): 100 ng / L; Benzoic acid: 2 mg / L; Humic acid: 5 mg / L.

[0060] Cross-flow microfiltration: a filtration technology in which liquid flows tangentially through the surface of a filter membrane. The membrane's pore size traps particulate matter, while the shear force of the tangential flow reduces membrane fouling. This technology can remove suspended particles, bacteria, and some colloids from the water, reducing the burden on subsequent treatment processes.

[0061] Turbulent shear force field: High-speed tangential flow creates turbulence on the membrane surface, increasing the shear force on the membrane surface, preventing particulate matter from depositing on the membrane surface, and at the same time stripping away and carrying away the trapped particulate matter.

[0062] Specific values ​​for cross-flow microfiltration in this embodiment: Membrane area: 0.1 m² 2 .

[0063] Tangential flow velocity: 2 m / s, achieved by adjusting the inlet flow rate and return flow rate.

[0064] Recirculation ratio: 3:1, which is the ratio of inlet flow rate to recirculation flow rate.

[0065] Membrane pore size: 0.22 μm, using polyethersulfone membrane, effectively retaining particles larger than this pore size.

[0066] Operating pressure: 0.1 MPa. Control the pressure difference across the membrane surface to not exceed this value to prevent membrane blockage.

[0067] Backwashing frequency: Backwash once every 30 minutes for 10 seconds to restore membrane flux.

[0068] Deep filtration: a multi-layer filtration technology in which liquid passes through filter media with different pore sizes in sequence. By utilizing the difference in pore gradient between the media and the surface adsorption effect, suspended particles, colloids and dissolved impurities are separated step by step. It can further remove fine particles, colloids and some dissolved impurities in water and improve water quality.

[0069] The specific values ​​for this deep filtration implementation are as follows: Coarse filter medium: quartz sand, particle size 1mm, mainly to remove larger suspended particles.

[0070] Medium filter medium: activated carbon, particle size 0.5mm, which removes some organic matter and colloids by adsorption.

[0071] Fine filter medium: diatomaceous earth, with a particle size of 50μm, further removes fine particles and dissolved impurities.

[0072] Floor height: 5cm on each floor, forming a gradient filter.

[0073] Flow rate: 100 mL / min, controlling the speed at which the liquid passes through the medium.

[0074] Empty bed residence time: 15 minutes, to ensure full contact between the liquid and the medium.

[0075] Backwashing frequency: Backwash once every 4 hours for 2 minutes to prevent media blockage.

[0076] Tunable-band ultraviolet irradiation: an ultraviolet light treatment technology that uses an adjustable-band ultraviolet light source to select the optimal band for irradiation based on the absorption characteristics of organic matter in water, thereby decomposing residual organic pollutants and further purifying the water quality.

[0077] Online spectral analysis: Real-time detection of organic composition and automatic adjustment of band combinations to ensure optimal processing results.

[0078] The specific values ​​for ultraviolet irradiation in this implementation are as follows:

[0079] Wavelength range: 200-400nm, adjustable band, select the optimal band according to the absorption characteristics of organic matter.

[0080] Main wavelength: 260nm, used to decompose most organic matter.

[0081] Secondary band: 310nm, used for the further decomposition of specific organic compounds.

[0082] Light intensity: 100mW / cm 2 This ensures sufficient energy to break down organic matter.

[0083] Irradiation mode: 2 minutes continuous, 1 second pulse / 1 second pause, cycled 3 times to improve irradiation efficiency.

[0084] Step S2 involves passing the pretreated water matrix through a composite metal oxide electrode with crystal plane engineering control, where it undergoes electrochemical catalytic oxidation under the action of a pulsed square wave current.

[0085] Step S2 further includes the following sub-steps:

[0086] S2-1 allows the pretreated water matrix to flow tangentially through the surface of the composite metal oxide electrode. The flow state is controlled by crystal plane engineering to bring the electrolyte into contact with specific active sites on the crystal plane.

[0087] S2-2 uses a pulsed power supply to apply an asymmetric square wave current to the electrolysis system. By synergistically controlling the forward pulse width, reverse pulse amplitude and interval time, hydroxyl radical active species are periodically generated on the electrode surface, and the deposits on the electrode surface are removed through electrochemical reduction.

[0088] S2-3 uses a redox potential sensor to monitor the potential change curve during electrolysis in real time and adjusts the pulse parameters according to the potential change characteristics.

[0089] S2-4 involves continuously adding a buffer solution to the electrolysis system and controlling the dosage through online pH monitoring to stabilize the electrolysis environment within the catalytic activity range.

[0090] It should be noted that crystal plane engineering control: by controlling the crystal growth direction of the electrode material, specific crystal planes are exposed on the electrode surface, thereby enhancing the catalytic activity of the electrode, increasing the density of active sites on the electrode surface, and enhancing the selectivity and efficiency of electrochemical reactions.

[0091] The specific values ​​for crystal plane engineering control in this implementation are as follows:

[0092] Electrode material: composite metal oxide (IrO2:Ta2O5:Sb2O5, mass ratio 70:20:10).

[0093] Tangential flow rate: 1 m / s, to ensure full contact between the electrolyte and the electrode surface.

[0094] Crystal plane exposure: Through crystal plane engineering, the area ratio of Ir(110) / Ir(101) crystal planes is adjusted to 3:1, thereby enhancing the density of active sites on the electrode surface.

[0095] Electrode area: 25cm² 2 Ensure sufficient reaction area.

[0096] Tangential flow: The liquid flows in a direction parallel to the surface of the filter membrane, rather than perpendicular to it. This flow pattern can reduce the accumulation of contaminants on the membrane surface and improve filtration efficiency. The shear force generated by the tangential flow velocity continuously strips and traps particulate contaminants on the membrane surface, preventing membrane pore blockage and extending the membrane's service life.

[0097] Composite metal oxide electrodes: Electrode materials composed of two or more metal oxides are commonly used in electrochemical reactions to improve the catalytic activity and stability of the electrode and enhance the efficiency of the electrochemical reaction.

[0098] Specific crystal plane active sites: Active sites on specific crystal planes on the surface of electrode materials, which have higher catalytic activity; through crystal plane engineering, specific crystal planes are exposed on the electrode surface, thereby improving the catalytic activity of the electrode.

[0099] Electrolyte: A liquid that can conduct electricity, usually containing mobile ions; in electrochemical reactions, the electrolyte provides the medium for ion transport, allowing current to flow between electrodes.

[0100] Detailed electrode contact process: The pretreated water matrix is ​​flowed tangentially through the surface of the composite metal oxide electrode at a speed of 1 m / s. The flow state is controlled by crystal surface engineering to ensure that the electrolyte is in full contact with the active sites of specific crystal surfaces. The anode is an electrode with an Ir(110) / Ir(101) crystal surface area ratio of 3:1. The active surface is exposed by a 1 kHz pulse square wave (5 ms forward / 2 ms reverse / 3 ms intermittent).

[0101] Pulse power supply: Apply an asymmetrical square wave current, which switches periodically between forward and reverse directions.

[0102] Electrolysis system: A system that includes an electrolytic cell, electrodes, and power supply components, used to carry out electrochemical reactions; by applying an electric current, the chemical substances in the electrolyte undergo oxidation-reduction reactions, thereby achieving specific chemical transformations.

[0103] Pulsed square wave current: a current waveform in which the current switches periodically between forward and reverse directions, with forward and reverse pulses. The forward pulse generates hydroxyl radicals (·OH), and the reverse pulse removes deposits on the electrode surface, thereby improving the stability and service life of the electrode.

[0104] The specific value of the pulsed square wave current in this implementation is as follows:

[0105] Current density: 10 mA / cm 2 Ensure sufficient current intensity.

[0106] Pulse frequency: 1kHz, ensuring efficient electrochemical reactions.

[0107] Positive pulse width: 5ms, used to generate hydroxyl radicals (·OH).

[0108] Reverse pulse amplitude: -2V, used to remove deposits from the electrode surface.

[0109] Interval time: 3ms, used for electrode surface recovery and regeneration.

[0110] Electrochemical catalytic oxidation: This method utilizes reactive oxygen species (hydroxyl radicals) generated by electrochemical reactions to oxidize organic pollutants in water, which can efficiently decompose organic pollutants and improve water quality.

[0111] Specific values ​​for electrochemical catalytic oxidation: Electrolysis time: 20 minutes; Electrolytic cell volume: 500 mL; Electrode distance: 1 cm (distance between anode and cathode).

[0112] Hydroxyl radicals are highly reactive free radicals with the chemical formula ·OH. They possess a high oxidizing capacity and can efficiently oxidize organic pollutants in water during electrochemical catalytic oxidation, breaking them down into harmless small molecules.

[0113] Electrochemical reduction: In an electrochemical reaction, a chemical substance is reduced by applying an electric current, which is the process of gaining electrons. In this embodiment, electrochemical reduction is used to remove deposits on the electrode surface and restore the activity of the electrode.

[0114] Detailed pulsed electrochemical process: An asymmetric square wave current is applied to the electrolysis system using a pulsed power supply, with the current density set to 10 mA / cm². 2 The total electrolysis time is 20 minutes. By synergistically controlling the forward pulse width, reverse pulse amplitude and interval time, hydroxyl radical active species are periodically generated on the electrode surface, and the deposits on the electrode surface are removed through electrochemical reduction. The potential sensor threshold is set to ±50mV. When the potential change exceeds this threshold, the pulse parameters are automatically adjusted.

[0115] Redox potential sensor: Real-time monitoring of potential changes on the electrode surface during electrolysis.

[0116] Potential change characteristics: Monitor potential change curves to capture characteristic potential fluctuation signals.

[0117] Adjusting pulse parameters: Based on the potential change characteristics, the forward pulse width, reverse pulse amplitude, and interval time are automatically adjusted to optimize electrochemical reaction conditions.

[0118] The specific values ​​for buffer control in this implementation are:

[0119] Buffer solution: 0.05M phosphate buffer, used to maintain the pH value of the electrolysis environment.

[0120] Online pH monitoring: Real-time monitoring of the electrolyte pH value to ensure it remains stable within the catalytic activity range.

[0121] Catalytic activity range: pH 6.8 ± 0.1, ensuring efficient electrochemical reaction.

[0122] Dosage control: Based on online pH monitoring data, the amount of buffer solution added is automatically adjusted to maintain the pH value of the electrolyte within the target range.

[0123] Detailed buffer control process: 0.05M phosphate buffer solution is continuously added to the electrolysis system, and the dosage is controlled by online pH monitoring feedback to stabilize the electrolysis environment within the catalytic activity range of pH 6.8±0.1.

[0124] Step S3: The electrochemically oxidized water matrix is ​​introduced into an amino-modified metal-organic framework material reactor for photocatalytic treatment under multi-band light irradiation.

[0125] Step S3 further includes the following sub-steps:

[0126] S3-1 allows the water matrix after electrochemical oxidation to flow over the surface of an amino-modified metal-organic framework material. By controlling the flow rate and flow state, a contact interface is established, allowing pollutant molecules to contact and bind with the amino-modified sites on the material surface.

[0127] S3-2 uses a multi-band combined illumination mode to excite metal-organic framework materials, and utilizes the photocatalytic properties of metal oxide nodes and the photosensitization effect of amino groups to generate active species such as hydroxyl radicals and superoxide radicals.

[0128] S3-3 uses online mass spectrometry to monitor the concentration of intermediate products of benzene rings and carboxylic acids in real time, designs photocatalytic reaction pathways, and adjusts the light intensity and time in stages to achieve the staged removal of pollutants from macromolecular cleavage to small molecule mineralization.

[0129] S3-4: Periodically interrupt the photocatalytic process, inject an oxidizing regeneration solution into the reaction system and mechanically stir it. The passivation layer on the catalyst surface is removed through the synergistic effect of chemical oxidation and physical scouring, restoring the surface active sites.

[0130] It should be noted that amino-modified metal-organic framework materials are materials in which amino groups are introduced onto the surface of a metal-organic framework material through chemical methods. The amino groups can enhance the material's adsorption capacity for specific pollutants and provide additional active sites during photocatalysis.

[0131] Amino modification sites on the material surface: Amino (-NH2) groups are introduced onto the material surface through chemical methods. These amino groups can act as active sites to participate in chemical reactions. Amino modification sites can enhance the material's adsorption capacity for specific pollutants and provide additional active sites during photocatalysis, promoting the degradation of pollutants. In this embodiment, an amino-modified metal-organic framework material (UiO-66-NH2) is used, whose amino modification sites can adsorb and bind to pollutant molecules (benzene rings and carboxylic acids).

[0132] Detailed process of contact and binding: The water matrix after electrochemical oxidation is flowed through the surface of the amino-modified metal-organic framework material, with the flow rate controlled at 50 mL / min and the empty bed residence time at 10 minutes, so that the pollutant molecules can fully contact and bind with the amino-modified sites on the material surface.

[0133] In this embodiment, the specific values ​​for contact and binding are as follows: flow rate: 50 mL / min, to ensure sufficient contact between the aqueous matrix and the amino-modified metal-organic framework material.

[0134] Flow state: By controlling the flow rate and reactor design, a stable contact interface is formed on the surface of the amino-modified metal-organic framework by the water matrix.

[0135] Material type: UiO-66-NH2, an amino-modified metal-organic framework material.

[0136] Defect concentration: 8%, providing sufficient active sites.

[0137] Particle size: 200-300nm, increasing specific surface area and improving adsorption efficiency.

[0138] Multi-band illumination: Using light of multiple bands simultaneously to improve photocatalytic efficiency; different bands of light can excite different photocatalytic reaction pathways, thereby improving the degradation efficiency of pollutants.

[0139] Photocatalytic treatment: Utilizing photocatalysts to generate reactive oxygen species (hydroxyl radicals and superoxide radicals) under light conditions, thereby oxidizing and decomposing organic pollutants in water, which can efficiently degrade organic pollutants and improve water quality.

[0140] Detailed process of photocatalytic reaction: A multi-band illumination mode is used (main band 365nm, light intensity 80mW / cm²). 2 Secondary band 310nm, light intensity 40mW / cm² 2The metal-organic framework material is excited, and the photocatalytic properties of the metal oxide nodes are combined with the photosensitization effect of the amino groups to generate active species such as hydroxyl radicals and superoxide radicals. The concentration of benzene ring and carboxylic acid intermediates is monitored by online mass spectrometry scanning m / z 50–500 every 5 minutes. The photocatalytic reaction pathway is designed, and the light intensity and time are adjusted in stages to achieve the staged removal of pollutants from macromolecular cleavage to small molecule mineralization.

[0141] Specific values ​​for the photocatalytic reaction in this embodiment: Illumination mode: Main wavelength 365nm (light intensity 80mW / cm²) 2 ), secondary band 310nm (light intensity 40mW / cm²) 2 ).

[0142] Photocatalytic properties: Metal oxide nodes (ZrO2) generate photogenerated electrons and holes under ultraviolet light irradiation, which excites the photosensitization effect of amino groups.

[0143] The photosensitization effect of amino groups: Under light conditions, amino groups can absorb light energy and convert it into chemical energy, thereby generating reactive oxygen species (hydroxyl radicals and superoxide radicals); this can enhance the efficiency of photocatalytic reactions and further improve the degradation efficiency of pollutants through synergistic effects with metal oxide nodes.

[0144] Active species: hydroxyl radicals (·OH) and superoxide radicals (·O2) - ), used to oxidize and decompose organic pollutants.

[0145] Online mass spectrometry: Real-time monitoring of intermediate product concentrations, benzene ring compounds, and carboxylic acids within the m / z range of 50–500.

[0146] Concentration of intermediate products such as benzene rings and carboxylic acids: During photocatalytic degradation, organic pollutants are first decomposed into a series of intermediate products, including benzene ring compounds (phenol, toluene) and carboxylic acids (acetic acid, benzoic acid). By monitoring the concentration changes of these intermediate products, the progress and efficiency of the photocatalytic reaction can be understood, thereby optimizing the reaction conditions. In this embodiment, the process of pollutants being gradually broken down from macromolecules to small molecules can be reflected.

[0147] A staged removal process from macromolecular cleavage to small molecule mineralization: In the photocatalytic degradation process, organic pollutants are first decomposed into larger intermediate products (benzene ring compounds), and then these intermediate products are further decomposed into smaller intermediate products (carboxylic acid compounds), and finally mineralized into inorganic small molecules (carbon dioxide and water). This staged removal process can ensure that pollutants are completely degraded and avoid secondary pollution to the environment caused by residual intermediate products.

[0148] In this embodiment, by adjusting the light intensity and time in stages, pollutants are gradually broken down from macromolecules (benzene ring compounds) to small molecules (carboxylic acid compounds), and finally mineralized into carbon dioxide and water. The specific steps are as follows:

[0149] 1. Initial stage: High light intensity (100mW / cm² at 365nm) 2 It is used for the rapid cleavage of macromolecular pollutants.

[0150] 2. Intermediate stage: Medium light intensity (365nm light intensity 80mW / cm²) 2 It is used to further decompose intermediate products.

[0151] 3. Final stage: Low light intensity (365nm light intensity 60mW / cm²) 2 It is used for mineralizing small molecule intermediates.

[0152] Reaction pathway design: Based on the changes in the concentration of intermediate products, adjust the light intensity and time to optimize the photocatalytic reaction pathway.

[0153] Light intensity adjustment: The light intensity of the main wavelength 365nm can be adjusted from 60-100mW / cm². 2 The intensity of the 310nm auxiliary band can be adjusted between 30-50mW / cm². 2 Adjustments between them.

[0154] Illumination time: The light is scanned every 5 minutes via online mass spectrometry, and the illumination time is adjusted according to the scan results to ensure that pollutants are gradually broken down from large molecules to small molecules and eventually mineralized.

[0155] Detailed process of catalyst regeneration: The photocatalytic process is interrupted periodically (once every 24 hours), 0.1% H2O2 solution is injected into the reaction system, circulated for 15 minutes, and then purged with nitrogen for 5 minutes. The passivation layer on the catalyst surface is removed through the synergistic effect of chemical oxidation and physical scouring, and the surface active sites are restored.

[0156] In this embodiment, the specific values ​​for catalyst regeneration are as follows: Interruption frequency: The photocatalytic process is interrupted once every 24 hours.

[0157] Regeneration solution: 0.1% H2O2 solution, which has strong oxidizing properties and is used to remove the passivation layer on the catalyst surface.

[0158] Mechanical stirring: Stirring time is 15 minutes to ensure that the regenerated solution is in full contact with the catalyst.

[0159] Nitrogen purging: After stirring, purge with nitrogen for 5 minutes to remove residual gases in the reaction system and restore the activity of the catalyst.

[0160] Step S4: The photocatalytically treated water matrix is ​​passed through a composite separation membrane module with a hydrophilic-hydrophobic heterogeneous interface to achieve gradient separation of volatile and non-volatile impurities.

[0161] Step S4 further includes the following sub-steps:

[0162] S4-1, construct a composite separation membrane surface with alternating distribution of hydrophilic and hydrophobic regions at the microscale, and make the hydrophilic region exhibit a contact angle of ≤30° and the hydrophobic region exhibit a contact angle of ≥120° through chemical modification;

[0163] S4-2 allows the photocatalytically treated water matrix to pass through the surface of the composite separation membrane in a tangential flow manner. By utilizing the surface energy difference between the hydrophilic and hydrophobic regions, volatile components are adsorbed in the hydrophobic region, while non-volatile components are enriched in the hydrophilic region.

[0164] S4-3, a temperature gradient field is established on both sides of the membrane module to maintain the hydrophobic region at 50-70℃ to promote the desorption and vaporization of volatile components, and maintain the hydrophilic region at 30-50℃ to enhance the retention of non-volatile components.

[0165] S4-4 controls the mass transfer rate of volatile components by adjusting the transmembrane pressure difference, while optimizing the water flux in the hydrophilic zone, thereby achieving gradient separation of volatile and non-volatile impurities.

[0166] It should be noted that the detailed process of membrane surface construction is as follows: a PTFE composite separation membrane surface with alternating distribution of microscale hydrophilic regions (contact angle 28°) and hydrophobic regions (contact angle 125°) is constructed, with an alternation period of 100 μm.

[0167] Detailed process of flow and separation: The photocatalytically treated water matrix is ​​passed through the surface of the composite separation membrane in a tangential flow manner. Utilizing the surface energy difference between the hydrophilic and hydrophobic regions, volatile components (benzene, toluene) are adsorbed in the hydrophobic region, while non-volatile components (humic acid, benzoic acid) are enriched in the hydrophilic region. The flow rate is controlled at 50 mL / min, and the transmembrane pressure difference is set to 0.08 MPa.

[0168] Detailed process of temperature gradient: A temperature gradient field is established on both sides of the membrane module, with the hydrophobic region maintained at 60℃ and the hydrophilic region at 40℃, a temperature difference of 20℃. The mass transfer rate of volatile components is controlled by adjusting the transmembrane pressure difference, while the water flux in the hydrophilic region is optimized to achieve gradient separation of volatile and non-volatile impurities. The flux is monitored every 10 minutes, and when the flux decreases by more than 20%, it is backflushed with 0.15MPa nitrogen for 30 seconds.

[0169] Hydrophilic-hydrophobic heterogeneous interface: The membrane surface has a microstructure with alternating hydrophilic and hydrophobic regions. The difference in surface energy between the hydrophilic and hydrophobic regions causes substances with different properties to behave differently on the membrane surface; the hydrophilic region attracts non-volatile impurities, while the hydrophobic region attracts volatile impurities, thereby achieving the separation of the two.

[0170] Composite separation membrane modules: Membrane modules composed of multiple layers or materials, used to separate substances with different properties; through the hydrophilic and hydrophobic heterogeneous interfaces of the membrane, gradient separation of volatile and non-volatile impurities is achieved.

[0171] Gradient separation: By controlling the hydrophilic and hydrophobic regions on the membrane surface and the temperature gradient, substances with different properties can be separated step by step, which can improve separation efficiency and reduce cross-contamination of impurities.

[0172] Hydrophilic region modification: Acrylic acid is grafted onto the hydrophilic region using oxygen plasma, reducing the contact angle of the hydrophilic region to ≤30°.

[0173] Hydrophobic region modification: The contact angle of the hydrophobic region is increased to ≥120° by fluorosilane treatment.

[0174] Alternation period: 100μm, ensuring uniform alternation between hydrophilic and hydrophobic zones.

[0175] Membrane type: PTFE-based membrane, with good chemical stability and mechanical properties.

[0176] Tangential flow velocity: 1 m / s, to ensure that the water matrix forms a stable tangential flow on the membrane surface.

[0177] Hydrophilic and hydrophobic regions: The hydrophilic region attracts non-volatile impurities, while the hydrophobic region attracts volatile impurities.

[0178] Surface energy difference: The low contact angle of the hydrophilic region and the high contact angle of the hydrophobic region cause substances with different properties to behave differently on the membrane surface, thereby achieving separation.

[0179] Temperature gradient: hydrophobic region temperature 50-70℃, hydrophilic region temperature 30-50℃.

[0180] Function: The high temperature in the hydrophobic region promotes the desorption and vaporization of volatile components, while the low temperature in the hydrophilic region enhances the retention of non-volatile components.

[0181] Temperature difference: 20℃, to ensure the different behaviors of volatile and non-volatile components in different regions.

[0182] Transmembrane pressure difference: 0.08 MPa. The mass transfer rate of volatile components is controlled by adjusting the transmembrane pressure difference.

[0183] Water flux optimization: By optimizing the water flux in the hydrophilic zone, the effective retention of non-volatile components is ensured.

[0184] Monitoring and adjustment: Monitor the flux every 10 minutes. When the flux drops by more than 20%, backflush with 0.15MPa nitrogen for 30 seconds to restore the membrane flux.

[0185] Step S5: In an inert atmosphere, a composite stabilizer containing nano-metals and organic antioxidants is added to the aqueous matrix after membrane separation and then encapsulated and sealed.

[0186] Step S5 further includes the following sub-steps:

[0187] S5-1 establishes an inert protective environment in a sealed container through a multi-stage gas replacement process. It uses a large flow of inert gas to replace the air and reduce the oxygen content to below 100 mg / L. Through micro-flow control, the residual oxygen content is kept stable below 10 mg / L.

[0188] S5-2, the membrane separation water matrix and composite stabilizer are simultaneously introduced into the container, and the nano-metal particles are uniformly dispersed by two-way jet mixing technology, while the organic antioxidant forms a molecular protective network;

[0189] S5-3, remove the gas from the top space of the sealed container, complete the sealing process using a hot melt sealing process, and verify the integrity of the seal using mass spectrometry.

[0190] It should be noted that the detailed process of gas replacement is as follows: an inert protective environment is established in the sealed container through a multi-stage gas replacement process, and nitrogen is used at a flow rate of 5L / min for 5 minutes to reduce the oxygen content to below 10mg / L. The residual oxygen content is then stabilized below 10mg / L through micro-flow control.

[0191] Detailed mixing and dispersion process: The aqueous matrix after membrane separation and the composite stabilizer (30 mg / L nano silver sol + 0.03% ascorbate palmitate) are simultaneously introduced into the container and mixed at a 1:1 volume ratio using a Y-type microfluidic chip. The Reynolds number is controlled at around 200 to ensure uniform dispersion of the nano silver particles. At the same time, the organic antioxidant forms a molecular protective network.

[0192] Detailed encapsulation and verification process: Gas was purged from the top space of the sealed container, and a heat-sealing process was performed at 200℃ and 0.3 MPa. The integrity of the seal was verified by mass spectrometry, with a helium tracer leakage rate of less than 1×10⁻⁶. -9 Pa·m 3 / s.

[0193] Inert atmosphere environment: A low-oxygen or oxygen-free environment, usually using inert gases (nitrogen or argon) to remove oxygen from the air, preventing oxidation reactions, and preventing the nano-metal particles and organic antioxidants in the water matrix from being oxidized during the encapsulation process, thus extending the shelf life of the standard.

[0194] Composite stabilizer: A mixture containing nano-metal particles and organic antioxidants to prevent impurities in the aqueous matrix from undergoing chemical changes after encapsulation. The nano-metal particles (silver nanoparticles) have antibacterial properties, and the organic antioxidant (ascorbyl palmitate) can prevent oxidation reactions.

[0195] Encapsulation and sealing: After the treated water matrix is ​​mixed with the composite stabilizer, it is poured into a sealed container and sealed to prevent external contamination and oxidation, thus ensuring the stability and purity of the water matrix standard during storage and transportation.

[0196] Gas replacement process: Nitrogen gas is used for multi-stage replacement. First, a large flow rate (5L / min) of nitrogen gas is used to quickly replace the air in the container, reducing the oxygen content to below 100mg / L.

[0197] Micro-flow control: Nitrogen gas is then continuously introduced through a micro-flow controller (0.1L / min) to keep the residual oxygen level stable below 10mg / L.

[0198] Oxygen content monitoring: Use an online oxygen probe to monitor oxygen content in real time to ensure the replacement effect.

[0199] Synchronous introduction: The water matrix after membrane separation and the composite stabilizer (30 mg / L nano silver sol + 0.03% ascorbate palmitate) are synchronously introduced into a sealed container through a Y-type microfluidic chip.

[0200] Two-way jet mixing technology: Through two-way jet mixing technology, nano-metal particles are uniformly dispersed in an aqueous matrix, while organic antioxidants form a molecular protective network.

[0201] Remove gas from the top space: Before sealing, remove gas from the top space of the sealed container by vacuuming or purging with nitrogen.

[0202] Hot melt sealing process: Use a hot melt sealing machine, set the temperature to 200℃ and the pressure to 0.3MPa, to perform hot melt sealing.

[0203] Seal integrity verification: Helium leakage rate was detected by mass spectrometry to ensure the leakage rate was less than 1×10⁻⁶. -9 Pa·m 3 / s, verify the integrity of the seal.

[0204] Step S6: Real-time monitoring of organic carbon, heavy metals and bioactivity indicators is carried out using multispectral technology, and process parameters are dynamically optimized based on a deep reinforcement learning model.

[0205] Step S6 further includes a sub-step with a concentration of mg / L:

[0206] S6-1: Real-time acquisition of spectral characteristic signals of water samples through multispectral sensing technology, simultaneous collection of detection data of total organic carbon, heavy metals and bioactivity indicators, and establishment of a mapping relationship model between spectral characteristics and pollutant content to achieve in-situ monitoring of multiple parameters.

[0207] S6-2, a dynamic evaluation matrix including electrocatalytic oxidation efficiency, photocatalytic degradation rate and membrane flux is constructed. The optimization scheme of process parameters is calculated by reinforcement learning algorithm. The process parameters include electrocatalytic current density, photocatalytic light intensity and membrane separation transmembrane pressure difference.

[0208] It should be noted that the detailed data acquisition process involved: acquiring the spectral characteristic signals (200–800 nm) of the water sample in real time using multispectral sensing technology, while simultaneously collecting data on total organic carbon (TOC) and heavy metals (Cd). 2+ The system collects detection data of spectral characteristics and bioactivity indicators, and establishes a mapping model between spectral features and pollutant content to achieve multi-parameter in-situ monitoring. Data is collected every 30 seconds and uploaded to the cloud via an edge computing box.

[0209] Detailed process of model optimization: A dynamic evaluation matrix including electrocatalytic oxidation efficiency, photocatalytic degradation rate, and membrane flux is constructed. A deep reinforcement learning model outputs optimized process parameters every 5 minutes. Optimized parameters include: current density adjustment range ±2 mA / cm². 2 Light intensity adjustment range ±10mW / cm 2 The transmembrane pressure differential adjustment range is ±0.01 MPa.

[0210] Multispectral technology: This technology combines multiple spectral techniques (ultraviolet-visible spectroscopy, near-infrared spectroscopy) to monitor multiple parameters simultaneously. It can acquire the spectral characteristic signals of water samples in real time, and simultaneously collect detection data of multiple pollutants to achieve in-situ monitoring of multiple parameters.

[0211] Deep reinforcement learning model: An algorithm that combines deep learning and reinforcement learning, dynamically optimizes the decision-making process through environmental feedback, and dynamically optimizes process parameters based on real-time monitoring data to improve processing efficiency and stability.

[0212] The architecture of deep reinforcement learning models includes:

[0213] Algorithm architecture: Actor-Critic network.

[0214] Input layer: spectral data (200-800nm), TOC, heavy metal concentration.

[0215] Output layer: Optimized values ​​for current density, light intensity, and transmembrane pressure difference.

[0216] Training data: 100 sets of historical process parameters and effect data.

[0217] Dynamic optimization: Based on real-time monitoring data, process parameters are dynamically adjusted to achieve the best processing effect, which can improve processing efficiency, reduce energy consumption, and extend equipment life.

[0218] Multispectral sensing technology: Using a fiber optic spectrometer to acquire the spectral characteristic signals of water samples in real time, with a spectral range covering 200–800 nm.

[0219] Detection data: Total organic carbon (TOC) and heavy metals (Cd) were collected simultaneously. 2+ ) and bioactivity indicators (total bacterial count) detection data.

[0220] Mapping relationship model: A mapping relationship model between spectral features and pollutant content is established through machine learning algorithms to achieve multi-parameter in-situ monitoring.

[0221] The specific values ​​for multispectral sensing technology include: spectral range: 200–800 nm; detection frequency: data acquisition every 30 seconds; TOC detection range: 0.1–10 mg / L; heavy metal detection range: 0.1–100 μg / L; bioactivity index: total bacterial count (CFU / mL).

[0222] Reinforcement learning algorithm: A reinforcement learning algorithm using the Actor-Critic architecture dynamically optimizes process parameters based on real-time monitoring data.

[0223] The effectiveness of this embodiment was verified as follows: after running 6 batches, the average TOC value was 0.8ppb, Cd2+ was not detected, PFOS was less than 0.2ppt, and the antibacterial effect lasted for 18 months (under light-protected conditions at 25℃).

[0224] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for removing impurities from water-based matrix standards, characterized in that, Includes the following steps: Step S1: The water matrix to be treated is subjected to cross-flow microfiltration, depth filtration and band-tunable ultraviolet irradiation pretreatment in sequence. Step S2 involves passing the pretreated water matrix through a composite metal oxide electrode with crystal plane engineering control, where it undergoes electrochemical catalytic oxidation under the action of a pulsed square wave current. Step S3: The electrochemically oxidized water matrix is ​​introduced into an amino-modified metal-organic framework material reactor for photocatalytic treatment under multi-band light irradiation. Step S4: The photocatalytically treated water matrix is ​​passed through a composite separation membrane module with a hydrophilic-hydrophobic heterogeneous interface to achieve gradient separation of volatile and non-volatile impurities. Step S5: In an inert atmosphere, a composite stabilizer containing nano-metals and organic antioxidants is added to the aqueous matrix after membrane separation and then encapsulated and sealed. Step S6 involves real-time monitoring of organic carbon, heavy metals, and bioactivity indicators using multispectral technology, and dynamic optimization of process parameters based on a deep reinforcement learning model.

2. The method for removing impurities from water-based matrix standards according to claim 1, characterized in that: Step S1 further includes the following sub-steps: S1-1, which causes the substrate of the water to be treated to flow tangentially along the surface of the microfiltration membrane. By adjusting the influent flow rate and the return flow rate, a turbulent shear force field is formed on the membrane surface, which continuously strips off and traps particulate pollutants on the membrane surface. S1-2, the water matrix after cross-flow microfiltration is passed through three stages of filter media: coarse, medium and fine. The pore gradient difference and surface adsorption between the media are used to achieve the step-by-step separation and removal of suspended particles, colloidal substances and dissolved impurities. S1-3 uses ultraviolet light to irradiate the deeply filtered water matrix, and detects the organic composition through online spectral analysis. It automatically adjusts the 200-400nm wavelength combination of the ultraviolet light source to decompose residual pollutants through photochemical action.

3. The method for removing impurities from water-based matrix standards according to claim 1, characterized in that: Step S2 further includes the following sub-steps: S2-1 allows the pretreated water matrix to flow tangentially through the surface of the composite metal oxide electrode. The flow state is controlled by crystal plane engineering to bring the electrolyte into contact with specific active sites on the crystal plane. S2-2 uses a pulsed power supply to apply an asymmetric square wave current to the electrolysis system. By synergistically controlling the forward pulse width, reverse pulse amplitude and interval time, hydroxyl radical active species are periodically generated on the electrode surface, and the deposits on the electrode surface are removed through electrochemical reduction. S2-3 uses a redox potential sensor to monitor the potential change curve during electrolysis in real time and adjusts the pulse parameters according to the potential change characteristics. S2-4 involves continuously adding a buffer solution to the electrolysis system and controlling the dosage through online pH monitoring to stabilize the electrolysis environment within the catalytic activity range.

4. The method for removing impurities from water-based matrix standards according to claim 1, characterized in that: Step S3 further includes the following sub-steps: S3-1 allows the water matrix after electrochemical oxidation to flow over the surface of an amino-modified metal-organic framework material. By controlling the flow rate and flow state, a contact interface is established, allowing pollutant molecules to contact and bind with the amino-modified sites on the material surface. S3-2 uses a multi-band combined illumination mode to excite metal-organic framework materials, and utilizes the photocatalytic properties of metal oxide nodes and the photosensitization effect of amino groups to generate active species such as hydroxyl radicals and superoxide radicals. S3-3 uses online mass spectrometry to monitor the concentration of intermediate products of benzene rings and carboxylic acids in real time, designs photocatalytic reaction pathways, and adjusts the light intensity and time in stages to achieve the staged removal of pollutants from macromolecular cleavage to small molecule mineralization. S3-4: Periodically interrupt the photocatalytic process, inject an oxidizing regeneration solution into the reaction system and mechanically stir it. The passivation layer on the catalyst surface is removed through the synergistic effect of chemical oxidation and physical scouring, restoring the surface active sites.

5. The method for removing impurities from water-based matrix standards according to claim 1, characterized in that: Step S4 further includes the following sub-steps: S4-1, construct a composite separation membrane surface with alternating distribution of hydrophilic and hydrophobic regions at the microscale, and make the hydrophilic region exhibit a contact angle of ≤30° and the hydrophobic region exhibit a contact angle of ≥120° through chemical modification; S4-2 allows the photocatalytically treated water matrix to pass through the surface of the composite separation membrane in a tangential flow manner. By utilizing the surface energy difference between the hydrophilic and hydrophobic regions, volatile components are adsorbed in the hydrophobic region, while non-volatile components are enriched in the hydrophilic region. S4-3, a temperature gradient field is established on both sides of the membrane module to maintain the hydrophobic region at 50-70℃ to promote the desorption and vaporization of volatile components, and maintain the hydrophilic region at 30-50℃ to enhance the retention of non-volatile components. S4-4 controls the mass transfer rate of volatile components by adjusting the transmembrane pressure difference, while optimizing the water flux in the hydrophilic zone, thereby achieving gradient separation of volatile and non-volatile impurities.

6. The method for removing impurities from water-based matrix standards according to claim 1, characterized in that: Step S5 further includes the following sub-steps: S5-1 establishes an inert protective environment in a sealed container through a multi-stage gas replacement process. It uses a large flow of inert gas to replace the air and reduce the oxygen content to below 100 mg / L. Through micro-flow control, the residual oxygen content is kept stable below 10 mg / L. S5-2, the membrane separation water matrix and composite stabilizer are simultaneously introduced into the container, and the nano-metal particles are uniformly dispersed by two-way jet mixing technology, while the organic antioxidant forms a molecular protective network; S5-3, remove the gas from the top space of the sealed container, complete the sealing process using a hot melt sealing process, and verify the integrity of the seal using mass spectrometry.

7. The method for removing impurities from water-based matrix standards according to claim 1, characterized in that: Step S6 further includes the following sub-steps: S6-1: Real-time acquisition of spectral characteristic signals of water samples through multispectral sensing technology, simultaneous collection of detection data of total organic carbon, heavy metals and bioactivity indicators, and establishment of a mapping relationship model between spectral characteristics and pollutant content to achieve in-situ monitoring of multiple parameters. S6-2, construct a dynamic evaluation matrix that includes electrocatalytic oxidation efficiency, photocatalytic degradation rate and membrane flux, and calculate the process parameter optimization scheme through reinforcement learning algorithm. The process parameters include electrocatalytic current density, photocatalytic light intensity and membrane separation transmembrane pressure difference.

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