Experimental device for simulating water supply network to adsorb colloidal micro-plastics

Abstract

The invention provides an experimental device for simulating a water supply network to adsorb colloidal micro-plastics. The experimental device comprises an electrochemical simulation unit, a temperature regulation module and a flow velocity control module, wherein the electrochemical simulation unit comprises a three-dimensional moving device (1), an electrochemical workstation (6) and a simulated pollutant medium (8); the temperature adjusting module comprises a closed temperature control jacket device (13), and the simulated pollutant medium (8) is filled in the closed temperature control jacket device (13); the flow velocity control module comprises a magnetic driving mechanism (4) and a flow velocity simulation magnetic stirring device (11), and the flow velocity simulation magnetic stirring device (11) is arranged on the outer side wall of the closed temperature control jacket device (13). According to the invention, conventional electrochemical measurement and pipe wall potential simulation are creatively combined, and a simulation device with high simulation degree, strong controllability and excellent sensitivity is provided for research on colloidal micro-plastics of a water supply pipe network.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical detection, and more specifically, to an experimental device for simulating the adsorption of colloidal microplastics in a water supply network. Background Art

[0002] The water quality safety of water supply networks has always been a key concern in public health and environmental engineering. Among them, colloidal microplastic particles in the network will adsorb and accumulate on the pipe wall, affecting the quality of water transmission and distribution. In recent years, microplastic pollutants, as emerging pollutants, have been detected in various water bodies. Their particles are tiny, easy to adsorb, and have strong mobility, posing potential hazards to human health. Especially in the tap water supply system, colloidal particles such as microplastics may enter the network through the original water source or pipeline aging, adhere to the pipe wall and be released again, causing secondary pollution.

[0003] In the water supply network, the detection of colloidal microplastic particles is challenging due to their small particle size and strong dispersibility. Existing water quality pollutant detections mainly rely on laboratory analysis methods. Commonly used analysis methods include dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA), which can characterize the particle size distribution and concentration of colloidal particles. Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy are used for component analysis and identification, and the types of microplastics are identified based on the absorption characteristics of infrared light by the sample and the molecular vibration scattering spectral atlas respectively. However, the above detection means have obvious limitations when applied to the water supply network system: on the one hand, the background impurities in the actual water samples of the network are complex, often accompanied by inorganic particles, organic matter and corrosion products, which are likely to interfere with the separation and identification of microplastics; on the other hand, the concentration of colloidal microplastics is usually extremely low, and high-sensitivity instruments are required for enrichment and detection, resulting in high detection costs and long operation cycles. In addition, existing technologies generally rely on laboratory sample processing and lack a simulation platform that can reflect the actual water supply conditions, which is not conducive to studying the adsorption behavior, migration law of microplastics in the network and their interfacial interaction with pipeline materials.

[0004] In recent years, electrochemical detection technology has been gradually applied to the monitoring of water pollutants due to its advantages such as high sensitivity, portable equipment, and rapid response. For example, some studies have developed electrochemical sensors for heavy metal ions, residual chlorine, etc., which can achieve rapid on-site detection. However, for colloidal pollutants (such as microplastics) in water supply networks, traditional electrochemical detection devices still have limitations: (1) Unable to simulate multiple pipe wall materials simultaneously: Existing devices often focus on corrosion or pollution monitoring of pipes with a single material, lacking means to simulate the pipe wall states with different corrosion degrees, and it is difficult to evaluate the influence of pipe walls on pollutant adsorption under different life cycles; (2) Lack of automatic control function: Many experimental devices require manual adjustment of temperature, flow rate, and water quality conditions, and are unable to maintain the actual operating parameters of the water supply network stably for a long time, resulting in insufficient experimental repeatability and the ability to simulate the real environment. Therefore, there is an urgent need to develop an experimental device that can simulate the operating environment of the water supply network and observe the adsorption behavior of colloidal microplastics to promote the research on the pollution mechanism and risk assessment of microplastics in the real water distribution system. Summary of the Invention

[0005] In view of this, the present invention proposes an experimental device for simulating the adsorption of colloidal microplastics in a water supply network to solve the problems existing in the above-mentioned prior art. The device of the present invention is designed specifically for studying the behavior of colloidal microplastics adsorbed on the pipe wall in a water supply network, and can simulate the adsorption process of microplastics on the pipe wall under different pipe corrosion conditions and operating conditions. Through the present invention, an experimental simulation device with high simulation degree, strong controllability, and excellent sensitivity can be provided for the research on colloidal microplastics in the water supply network.

[0006] To achieve the above object, the present invention proposes an experimental device for simulating the adsorption of colloidal microplastics in a water supply network, including an electrochemical simulation unit, a temperature adjustment module, and a flow rate control module;

[0007] The electrochemical simulation unit includes a three-dimensional moving device, an electrochemical workstation, and a simulated pollutant medium; the three-dimensional moving device is connected to the electrochemical workstation through a working electrode; at the same time, the three-dimensional moving device is connected to the simulated pollutant medium through a reference electrode and an auxiliary electrode;

[0008] The temperature adjustment module includes a closed temperature control jacket device, and the simulated pollutant medium is filled inside the closed temperature control jacket device;

[0009] The flow rate control module includes a magnetic drive mechanism and a simulated flow rate magnetic stirring device; the simulated flow rate magnetic stirring device is arranged on the outer side wall of the closed temperature control jacket device.

[0010] Furthermore, a temperature control water inlet and a temperature control water outlet are respectively arranged on two outer sides of the closed temperature control jacket device; a temperature control medium is arranged between the closed temperature control jacket device and the simulated pollutant medium; the temperature control medium is introduced from the temperature control water inlet and led out from the temperature control water outlet.

[0011] Furthermore, the simulated pollutant medium is implemented as containing uniformly dispersed colloidal microplastic pollutants.

[0012] Furthermore, the working electrode is preferably made of ductile iron and is arranged in a sunken circular area outside the closed temperature control jacket device for electrochemical reaction.

[0013] Furthermore, the working electrode is connected to the electrochemical workstation through a copper wire, and the copper wire 12 extends along the bottom of the closed temperature control jacket device and passes through the body of the closed temperature control jacket device through a preset sealed wire interface.

[0014] Furthermore, the material of the sealed wire interface includes but is not limited to glass sealing, ceramic insulating tube, and corrosion-resistant epoxy resin.

[0015] Furthermore, the simulated flow rate magnetic stirring device includes a convex cavity, the convex cavity is communicated with the inside of the closed temperature control jacket device, and a magnetic stirrer is arranged inside the convex cavity;

[0016] The magnetic driving mechanism drives the magnetic stirrer to rotate inside the simulated pollutant medium, so that the simulated pollutant medium is fully mixed.

[0017] Furthermore, the convex cavity is a columnar structure, and a local sunken area is formed between the internal space of the convex cavity and the side wall of the closed temperature control jacket device for stabilizing the spatial position of the magnetic stirrer.

[0018] Furthermore, the reference electrode is preferably an Ag / AgCl electrode or a saturated calomel electrode, and the electrode structure of the reference electrode 2 includes a stable internal reference solution and a semi-permeable membrane or a ceramic hole interface.

[0019] Furthermore, the auxiliary electrode is preferably made of a platinum wire, a graphite rod, a carbon rod or a stainless steel sheet; the auxiliary electrode is used to provide a current loop, form a current path with the working electrode, and adjust the current of the auxiliary electrode through a potentiostat.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The present invention solves the defect in the prior art of lacking the simulation of different corroded pipe walls and water supply environments. Innovatively, it combines conventional electrochemical measurements with pipe wall potential simulation to achieve precise electrochemical adsorption of 1-μm-diameter polystyrene (PS) microplastics in the water supply system, providing an experimental simulation device with high simulation degree, strong controllability and excellent sensitivity for the research of colloidal microplastics in water supply networks.

[0022] The device of the present invention can realistically simulate various characteristics of the actual water supply network in the laboratory (such as pipe wall material types, variable hydraulic conditions, typical water quality parameters, etc.). In particular, it can simultaneously accommodate different service life times and corrosion conditions of metal pipelines for comparative research. This highly simulated environment makes the behavior of pollutants such as microplastics closer to the actual working conditions, thereby improving the applicability and guiding significance of the research conclusions for the real water supply system.

[0023] Through temperature, flow rate and water quality control, the device of the present invention can strictly maintain the preset experimental conditions and reduce the influence of human errors and environmental fluctuations. For example, it can constantly control the water temperature and flow rate to ensure that each experiment is carried out under the same reference conditions. This controllable and repeatable test method improves the reliability and accuracy of the data and facilitates quantitative comparative analysis of the influence of different factors.

[0024] The present invention simplifies and speeds up the simulation of the pipe wall state under different service cycles through electrochemical technology, greatly improving the experimental efficiency. Compared with the traditional method relying on off-line sampling and analysis, this device can real-time simulate the adsorption process of colloidal microplastic pollutants, providing a more sensitive and rapid means for the monitoring and control of network pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0026] Figure 1 is the overall structural schematic diagram of the device in the embodiment of the present invention;

[0027] Figure 2 is the schematic diagram of electrochemical detection in the embodiment of the present invention;

[0028] Figure 3 is the schematic diagram of the change in electrochemical adsorption amount in the embodiment of the present invention;

[0029] The reference numerals are as follows:

[0030] 1 - Three - dimensional movement control device, 2 - Reference electrode, 3 - Working electrode, 4 - Magnetic drive mechanism, 5 - Temperature - controlled water inlet, 6 - Electrochemical workstation, 7 - Auxiliary electrode, 8 - Simulated pollutant medium, 9 - Temperature - controlled medium, 10 - Temperature - controlled water outlet, 11 - Simulated flow velocity magnetic stirring device, 12 - Copper wire, 13 - Enclosed temperature - controlled jacket device. Specific embodiments

[0031] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] Embodiment 1

[0033] This embodiment presents an experimental device for simulating the adsorption of colloidal microplastics in a water supply network. By means of electrochemical simulation, this device can complete the all - round adsorption of colloidal microplastics under different hydraulic and water quality environments of different pipe wall lifetimes in the water supply network.

[0034] As shown in Figure 1 , this device consists of three parts: an electrochemical simulation unit, a temperature regulation module, and a flow velocity control module. Each module works in coordination and is integrated into a system to simulate the physical and chemical environment of a real water supply network and realize the adsorption process of colloidal pollutants. Among them, the electrochemical simulation unit is provided in the central area of the temperature regulation module, and the flow velocity control module is located on the side wall of the electrochemical simulation unit.

[0035] As a preferred embodiment, the temperature regulation module is provided with a temperature - controlled medium flow circulation channel. The temperature - controlled medium 9 is a constant - temperature fluid at different temperatures. The circulation channel includes a temperature - controlled water inlet 5 and a temperature - controlled water outlet 10, realizing the upward flow of the temperature - controlled medium 9 to ensure the full circulation of the temperature - controlled medium 9 in the container. The structure of the temperature regulation module is an enclosed temperature - controlled jacket structure 13, and its central area is the electrochemical simulation unit, so that the electrochemical simulation unit is surrounded by the temperature - controlled medium for temperature control, improving the heat transfer efficiency and maintaining temperature stability.

[0036] As a preferred embodiment, the flow rate control module includes a magnetic drive mechanism 4 and a simulated flow rate magnetic stirring device 11. The magnetic drive mechanism 4 is implemented as a magnetic stirrer, which is located outside the side of the electrochemistry simulation unit. The simulated flow rate magnetic stirring device 11 is provided with a magnetic stirrer. The magnetic drive mechanism 4 drives the magnetic stirrer to rotate inside the electrochemistry simulation unit to achieve sufficient mixing of the simulated pollutant medium 8.

[0037] As a preferred embodiment, the simulated pollutant medium 8 is implemented as a water environment required for experiments containing uniformly dispersed colloidal microplastic pollutants.

[0038] As a preferred embodiment, the electrochemistry simulation unit includes a three-dimensional moving device 1, a reference electrode 2, a working electrode 3, an electrochemistry workstation 6, an auxiliary electrode 7, and a simulated pollutant medium 8. Among them, the reference electrode 2 and the auxiliary electrode 7 are connected to the three-dimensional moving device 1, and the three-dimensional moving device 1 is connected to the electrochemistry workstation 6. The three-dimensional moving device 1 is implemented as a three-dimensional movement control device, which can achieve three-dimensional movement with an accuracy of 1 m to control the precise measurement of the electrochemistry simulation unit. The reference electrode 2 is selected as an Ag / AgCl electrode or a saturated calomel electrode (SCE). Its electrode structure includes a stable internal reference solution (such as KCl solution), a semi-permeable membrane or a ceramic hole interface to provide a stable and reproducible reference potential. The material of the reference electrode 2 can be selected as a glass shell, a stainless steel shell or a polytetrafluoroethylene package to improve its corrosion resistance and maintainability. The auxiliary electrode 7 is used to provide a current loop, preferably made of a high-conductivity and corrosion-resistant material, such as a platinum wire, a graphite rod, a carbon rod or a stainless steel sheet. The auxiliary electrode 7 and the working electrode 3 form a current path, and the current of the auxiliary electrode is adjusted by a potentiostat to maintain the stability of the working electrode potential. The working electrode 3 is a metal material for studying water supply pipe networks, preferably ductile iron, and there is an embedded copper wire 12 on the lower surface. The electrochemistry workstation can run conventional electrochemistry tests.

[0039] Example Two

[0040] This embodiment proposes an experimental device for simulating the adsorption of colloidal microplastics in a water supply pipe network, including an electrochemistry simulation unit, a temperature regulation module, and a flow rate control module; among them:

[0041] The electrochemical simulation unit includes a three-dimensional moving device 1, a reference electrode 2, a working electrode 3, an electrochemical workstation 6, an auxiliary electrode 7, and a simulated pollutant medium 8. The working electrode 3 is a circular electrode for studying metal material specimens, made of a conductive material, located in a circular area recessed inward in the middle of the bottom of the electrochemical simulation unit, and used for electrochemical reactions. The working electrode 3 is fixed in the bottom recess of the closed temperature control jacket device 3 by means of crimping. Further, the working electrode 3 is electrically connected to an external electrochemical test system through a copper wire 12. The copper wire 12 extends along the bottom of the beaker and passes through the beaker body through a preset sealed wire interface structure. The wire interface may include sealing materials such as glass sealing, ceramic insulating tubes, and corrosion-resistant epoxy resins to ensure that the liquid does not leak and has good electrical contact stability. The wiring of the copper wire 12 is designed to be adhered to achieve the functions of electrode replacement, quick connection, or multi-electrode switching. The reference electrode 2 and the auxiliary electrode 7 are both connected to the three-dimensional movement control device 1, and at the same time, the working electrode 3 and the three-dimensional movement control device 1 are connected to the electrochemical workstation 6 for electrochemical testing. In actual simulated adsorption experiment studies, different electrodes can be connected to the electrochemical workstation 6 in different connection methods according to needs.

[0042] The temperature regulation module is implemented as a closed temperature control jacket device 13, the structural material of which is glass, equipped with a temperature control water inlet 5 and a temperature control water outlet 10, and contains a temperature control medium 9. The temperature control medium 9 is introduced from the temperature control water inlet 5 and led out from the temperature control water outlet 10.

[0043] The flow rate control module is implemented as a magnetic drive mechanism 4 and a simulated flow rate magnetic stirring device 11. The magnetic drive mechanism 4 is implemented as a magnetic stirrer. The simulated flow rate magnetic stirring device 11 has an external convex cavity provided in the side area of the electrochemical simulation unit. The convex cavity communicates with the internal space of the electrochemical simulation unit and is used to accommodate and position a magnetic stirrer (magnetic rotor). The convex cavity has a columnar structure, and a local recessed area can be formed between its internal space and the side wall of the beaker to stabilize the spatial position of the magnetic rotor and prevent drift or displacement during stirring. The convex cavity can be integrally formed by glass firing to ensure the sealing and heat resistance of the overall structure.

[0044] Taking the adsorption detection of colloidal polystyrene microplastics by ductile iron materials in a simulated cement mortar environment within 24 hours as an example, first, according to Figure 1Connect each module. The simulated pollutant medium 8 is a cement mortar simulation liquid with five different degrees of wear (divided into levels 1 - 5 from well - protected cement mortar to no cement mortar protection, where level 1 has the best protection effect and level 5 has no protection effect): Level 1: calcium hydroxide 20 mmol / L, sodium carbonate 20 mmol / L, sodium bicarbonate 10 mmol / L; Level 2: calcium hydroxide 10 mmol / L, sodium carbonate 10 mmol / L, sodium bicarbonate 10 mmol / L; Level 3: calcium hydroxide 5 mmol / L, sodium carbonate 5 mmol / L, sodium bicarbonate 15 mmol / L; Level 4: calcium hydroxide 1 mmol / L, sodium carbonate 2 mmol / L, sodium bicarbonate 20 mmol / L; Level 5: calcium hydroxide 0 mmol / L, sodium carbonate 0 mmol / L, sodium bicarbonate 0 mmol / L, that is, ultrapure water; The temperature - controlled medium 9 is ultrapure water at 25 °C. The rotational speed of the simulated flow rate magnetic stirring device 11 is 250 rpm. The working electrode 3 is a ductile iron metal specimen; The reference electrode 2 is a saturated calomel electrode and the auxiliary electrode 7 is made of platinum and copper wire 12 is connected to the electrochemical workstation 6. Start the experiment. Turn on the electrochemical workstation 6, select electrochemical testing, input the basic parameters such as the characteristics of the research metal material and experimental conditions (at 25 °C), select the measurement method as open - circuit potential (OCP) scanning, the scanning speed is 1 s / point. After the open - circuit potential is stable (the absolute value of the change is 0.5 mv), start counting, take 60 times, calculate the average value, which is the potential value of different ductile irons in cement mortar under different degrees of wear. Disconnect all electrochemical connections, replace the simulated pollutant medium with a colloidal polystyrene micro - plastic solution with a particle size of 1 μm and a concentration of 20 mg / L. The reference electrode 2 is a saturated calomel electrode and the auxiliary electrode 7 is made of platinum and is connected to the three - dimensional moving device 1. The three - dimensional moving device 1 is connected to the electrochemical workstation 6. At the same time, the copper wire 12 is connected to the electrochemical workstation 6. After detection, the electrochemical test result graph is as Figure 2 、 Figure 3 shown. The open - circuit potential of the ductile iron gradually decreases under the simulated liquid that simulates the gradual failure process of the cement mortar lining, which is basically consistent with the existing electrochemical test experimental results.

[0045] The results show that the device provided by the present invention realizes a high - fidelity simulation of the adsorption of colloidal micro - plastics on the pipe wall in the water supply network environment through the organic combination of each module. Its structural design is reasonable and its functions are perfect, which can meet the needs of researchers for the study of micro - plastic behavior under various factor conditions. In practical applications, the device can also be further modified accordingly for the development of on - line monitoring equipment or the optimization of pipe network pollution control strategies, so it has broad application prospects and significant practical value.

[0046] The device provided by the present invention can highly realistically reproduce the interaction between the pipe wall and colloidal microplastics in various states in the water supply network under laboratory conditions. When the device is operating, the water body containing microplastic particles with known concentrations flows through the test section of the device (the position where the working electrode 2 is located) under the drive of the driving device, and the temperature and water quality parameters are determined by the experimental conditions and remain stable. The conventional electrochemical system continuously monitors signals such as the potential and current of the pipe wall electrode to reflect macroscopic corrosion and deposition changes. The data of the entire system can be collected and processed by a computer or a microcontroller, and based on this, the experimenter can analyze the migration of microplastics and the adsorption law of the pipe wall under different conditions. By adjusting the pipe wall state, flow rate, temperature, and water chemical conditions, this device can systematically study the influence of various factors on the behavior of colloidal pollutants and provide a scientific basis for the pollution control of the water supply network.

[0047] Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes the preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still modifications or equivalent replacements can be made to the specific implementation manners of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. An experimental device for simulating the adsorption of colloidal microplastics in a water supply network, characterized in that, It includes an electrochemical simulation unit, a temperature regulation module, and a flow rate control module; The electrochemical simulation unit includes a three-dimensional moving device (1), an electrochemical workstation (6), and a simulated pollutant medium (8); the three-dimensional moving device (1) is connected to the electrochemical workstation (6) through a working electrode (3); at the same time, the three-dimensional moving device (1) is connected to the simulated pollutant medium (8) through a reference electrode (2) and an auxiliary electrode (7); The temperature regulation module includes a closed temperature control jacket device (13), and the simulated pollutant medium (8) is filled inside the closed temperature control jacket device (13); The flow rate control module includes a magnetic drive mechanism (4) and a simulated flow rate magnetic stirring device (11); the simulated flow rate magnetic stirring device (11) is arranged on the outer side wall of the closed temperature control jacket device (13).

2. The experimental device for simulating the adsorption of colloidal microplastics in a water supply pipe network according to claim 1, characterized in that, On both sides of the outside of the closed temperature control jacket device (13), a temperature control water inlet (5) and a temperature control water outlet (10) are respectively provided; a temperature control medium (9) is provided between the closed temperature control jacket device (13) and the simulated pollutant medium (8); the temperature control medium (9) is introduced from the temperature control water inlet (5) and led out from the temperature control water outlet (10).

3. The experimental device for simulating the adsorption of colloidal microplastics by a water supply network according to claim 1, characterized in that, The simulated pollutant medium (8) is implemented as containing uniformly dispersed colloidal microplastic pollutants.

4. The experimental device for simulating the adsorption of colloidal microplastics by a water supply pipe network according to claim 1, characterized in that, The material of the working electrode (3) is preferably nodular cast iron, which is arranged in a sunken circular area outside the closed temperature control jacket device (13) for electrochemical reaction.

5. The experimental device for simulating the adsorption of colloidal microplastics by a water supply pipe network according to claim 4, characterized in that, The working electrode (3) is connected to the electrochemical workstation (6) through a copper wire (12), and the copper wire (12) extends along the bottom of the closed temperature control jacket device (13) and passes through the body of the closed temperature control jacket device (13) through a preset sealed wire interface.

6. The experimental device for simulating the adsorption of colloidal microplastics by a water supply pipe network according to claim 5, characterized in that, The material of the sealed wire interface includes but is not limited to glass sealing, ceramic insulating tube, and corrosion-resistant epoxy resin.

7. The experimental device for simulating the adsorption of colloidal microplastics in a water supply pipe network according to claim 1, characterized in that, The simulated flow rate magnetic stirring device (11) includes a raised cavity, the raised cavity is communicated with the inside of the closed temperature control jacket device (13), and a magnetic stirring bar is arranged inside the raised cavity; The magnetic drive mechanism (4) rotates the magnetic stirring bar inside the simulated pollutant medium (8) to fully mix the simulated pollutant medium (8).

8. The experimental device for simulating the adsorption of colloidal microplastics by a water supply network according to claim 7, wherein, The raised cavity is a columnar structure, and a local depression area is formed between the internal space of the raised cavity and the side wall of the closed temperature control jacket device (13) for stabilizing the spatial position of the magnetic stirring bar.

9. The experimental device for simulating the adsorption of colloidal microplastics by a water supply pipe network according to claim 1, characterized in that, The reference electrode (2) is preferably an Ag / AgCl electrode or a saturated calomel electrode, and the electrode structure of the reference electrode (2) includes a stable internal reference solution and a semi-permeable membrane or a ceramic hole interface.

10. The experimental device for simulating the adsorption of colloidal microplastics by a water supply network according to claim 1, characterized in that, The auxiliary electrode (7) preferably uses a platinum wire, a graphite rod, a carbon rod or a stainless steel sheet; the auxiliary electrode (7) is used to provide a current loop, constitutes a current path with the working electrode (3), and the current of the auxiliary electrode (7) can be adjusted through a potentiostat.

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