Method for treating organic substance-containing liquid, kit for treating organic substance-containing liquid, organic substance-containing liquid treatment agent, and information processing device

Abstract

A method for treating an organic substance-containing liquid according to one embodiment of the present disclosure comprises a treatment step for irradiating a suspension containing an organic substance-containing liquid, a ferrite-based powder, and a persulfate with light including at least one of ultraviolet light and visible light.

Description

Method for treating organic substance-containing liquid, kit for treating organic substance-containing liquid, organic substance-containing liquid treating agent, and information processing apparatus

[0001] The present disclosure relates to a method for treating an organic substance-containing liquid, a kit for treating an organic substance-containing liquid, an organic substance-containing liquid treating agent, and an information processing apparatus.

[0002] Currently, water pollution is one of the most serious crises that humans are facing, and thus the treatment of water pollution is an important issue studied by environmental conservation researchers. In particular, the treatment of pollution caused by toxic and harmful organic substances in water bodies is a research focus and an urgent issue in water treatment engineering.

[0003] Under such circumstances, sulfate radicals (SO4 － •) generated by activating persulfate are attracting attention in wastewater treatment technology for treating wastewater containing persistent organic substances.

[0004] The standard redox potential of sulfate radicals (E0=+2.5 to +3.1 V) is higher than that of hydroxyl radicals (OH•) (E0=+1.9 to +2.7 V) generated by conventional photocatalysts such as titanium oxide, and the stability and half-life (30 to 40 microseconds (SO4 － •)) are also longer (20 nanoseconds for OH•), making them more efficient in the decomposition of organic pollutants.

[0005] On the other hand, it is known that persulfate has low activity even when used as-is, and its activation requires large amounts of energy such as light, heat, or ultrasound, (Non-Patent Documents 1 and 2), which has made widespread practical application difficult so far.

[0006] Accordingly, Patent Document 1 discloses that a metal-organic framework (MOF) is used as a heterogeneous catalyst to activate persulfate or peroxymonosulfate to generate sulfate ions. MOFs are reported to be reusable, have high activity, and exhibit good catalytic effects.

[0007] However, many MOFs are vulnerable to humidity and acidic / basic environments under specific conditions, and thus often cannot withstand long-term use. In addition, they often require expensive raw materials and complicated processes, which makes it difficult to obtain stable quality, among other issues.

[0008] Patent No. 6801844

[0009] S. Sonawane, MP Rayaroth, VK Landge, K. Fedorov, G. Boczkaj, Thermally activated persulfate-based Advanced Oxidation Processes-recent progress and challenges in mineralization of persistent organic chemicals: a review, Curr. Opin.Chem. Eng. 37 (2022) 100839D. Wen, X. Guo, Q. Li, R. Fu, Enhanced electrokinetically-delivered persulfate and alternating electric field induced thermal effect activated persulfate in situ for remediation of phenanthrene contaminated clay, J. Hazard Mater. 423 (2022)127199

[0010] This disclosure aims to provide a novel method for treating organic substance-containing liquids containing organic substances such as dyes, and a treatment agent that can be advantageously used in this method of treating organic substance-containing liquids. Furthermore, this disclosure also aims to provide an information processing device that can provide useful information for implementing the method of treating organic substance-containing liquids.

[0011] The inventors of this disclosure have found that the decomposition efficiency of organic matter is improved by mixing ferrite powder and persulfate in the presence of an organic matter-containing liquid and further irradiating it with light including ultraviolet and visible light, and have thus completed the embodiments of this disclosure. Accordingly, the embodiments of this disclosure are as follows.

[0012] [1] A method for treating an organic substance-containing liquid, comprising a treatment step of irradiating a suspension containing the organic substance-containing liquid, a ferrite-based powder, and a persulfate with light including at least one of ultraviolet light and visible light.

[0013] [2] The method for treating an organic substance-containing liquid according to [1], wherein the light is visible light.

[0014] [3] The ferrite powder has a perovskite crystal structure, a spinel crystal structure, a hexagonal crystal structure, or a garnet crystal structure. The method for treating an organic substance-containing liquid according to [1] or [2].

[0015] [4] The method for treating an organic substance-containing liquid according to any one of [1] to [3], wherein the persulfate is one or more of sodium persulfate, potassium persulfate, and ammonium persulfate.

[0016] [5] The method for treating an organic substance-containing liquid according to any one of [1] to [4], wherein the content of the ferrite powder in the suspension is in the range of 0.1 g / L or more and 10 g / L or less, and the content of the persulfate in the suspension is in the range of 0.1 mmol / L or more and 50 mmol / L or less.

[0017] [6] A method for treating an organic substance-containing liquid according to any one of [1] to [5], comprising a ferrite powder recovery step of separating and recovering the ferrite powder from the suspension after irradiation with light by magnetic force.

[0018] [7] The method for treating an organic substance-containing liquid according to [6], comprising a wastewater step of draining the suspension from which the ferrite powder has been separated and recovered to the outside.

[0019] [8] The method for treating an organic substance-containing liquid according to any one of [1] to [7], wherein the organic substance-containing liquid is industrial wastewater.

[0020] [9] A kit for treating organic substance-containing liquids, comprising ferrite powder and persulfate.

[0021]

[10] The kit for treating organic substance-containing liquids according to [9], wherein the average primary particle size of the ferrite powder is in the range of 1 nm to 1 μm.

[0022]

[11] The kit for treating an organic substance-containing liquid according to [9] or

[10] , wherein an average secondary particle diameter of the ferrite-based powder is within a range of 1 µm or more and 10 µm or less.

[0023]

[12] A treatment agent for an organic substance-containing liquid, comprising: a persulfate aqueous solution; and a ferrite-based powder dispersed in the persulfate aqueous solution.

[0024]

[13] An information processing device that provides information for the method for treating an organic substance-containing liquid according to any one of [1] to [8], wherein the information processing device provides information on the ferrite-based powder, information on the organic substance-containing liquid, and information on a treatment capacity of the ferrite-based powder for organic substances contained in the organic substance-containing liquid.

[0025] According to the present invention, it is possible to provide a novel method for treating an organic substance-containing liquid and a treatment agent that can be advantageously used in the method for treating an organic substance-containing liquid. Further, according to the present disclosure, it is possible to provide an information processing device that can provide useful information for implementing the method for treating an organic substance-containing liquid.

[0026] Ferrite powder particles obtained in Example 1 (ZnFe ２ O ４ ) is an XRD chart thereof. Ferrite powder particles obtained in Example 1 (ZnFe ２ O ４ ) is an SEM image thereof. Ferrite powder particles obtained in Example 1 (ZnFe ２ O ４ ) is an enlarged SEM image thereof. Ferrite powder particles obtained in Example 1 (ZnFe ２ O ４ ) is a TEM image thereof. Ferrite powder particles obtained in Example 1 (ZnFe ２ O ４ ) is an enlarged TEM image thereof. FIG. 1 is a graph showing results of treatment of organic substance-containing liquid performed in Examples 1, 2 and Comparative Example 1.

[0027] [Kit for treating organic substance-containing liquid] The kit for treating organic substance-containing liquid according to one embodiment of the present disclosure includes a ferrite-based powder and a persulfate. The kit for treating organic substance-containing liquid may further include a co-catalyst.

[0028] (Ferrite powder) Ferrite powder is a ferromagnetic material. Ferrite powder may be a powder of a material having one of the following crystal structures: perovskite crystal structure, spinel crystal structure, hexagonal crystal structure, or garnet crystal structure. Examples of materials with a perovskite crystal structure include MFeO ３ (wherein M represents at least one rare metal selected from the group consisting of La and Bi) can be used. As for materials with a spinel-type crystal structure, M Ｉ Fe ２ O ４ (However, M Ｉ (where represents at least one magnetic metal selected from the group consisting of Fe, Ni, and Co) can be used. As for materials with a hexagonal crystal structure, M ＩＩ Fe １２ O １９ (However, M ＩＩ (where represents at least one metal selected from the group consisting of Ba, Sr, and Pb) can be used. As a polycrystalline ferrite material with a garnet-type crystal structure, RFe ５ O １２ (where R is a rare earth element) can be used.

[0029] The crystalline structure of the ferrite powder may be single-crystal or polycrystalline. If the crystalline structure is polycrystalline, grain boundaries may exist between the crystal grains. The grain boundaries may be small enough to be visually identifiable in SEM (scanning electron microscope) images.

[0030] The shape of the crystalline particles of the ferrite powder is not particularly limited and may be spherical, rod-shaped, flake-shaped, flower-shaped, amorphous, etc., and if it is polycrystalline, it may contain any two or more combinations of these.

[0031] When the crystalline particles of the ferrite powder are single crystals, there are no particular limitations on the average particle size of the crystalline particles, but they may be in the range of, for example, 1 nm to 1 μm. When the crystalline particles are polycrystalline, there are no particular limitations on the average particle size of the crystalline particles, but they may be in the range of, for example, 1 nm to 1 μm. When the crystalline particles form secondary particles (aggregates), there are no particular limitations on the particle size of the secondary particles, and they may be, for example, 10 nm or larger, or 10 μm or smaller.

[0032] The particle diameter of a crystal grain is the arithmetic mean of the major and minor axes of the crystal grain as measured by SEM imaging. The average particle diameter of a crystal grain is the arithmetic mean of the particle diameters of 100 or more crystal grains.

[0033] The method for producing ferrite powder is not particularly limited. For example, when producing fine powder with an average particle size of 1 μm or less, methods such as a breakdown process and a build-up process can be used. A breakdown process is a method of obtaining fine particles by mechanically crushing large particles or clumps. A build-up process is a method of generating fine particles from raw materials using physical or chemical reactions.

[0034] Equipment used in the breakdown process includes jet mills, ball mills, planetary mills, and bead mills. For the build-up process, synthesis methods such as gas-phase, liquid-phase, and solid-phase methods are employed.

[0035] Gas-phase methods include chemical vapor deposition (CVD) such as thermal CVD, plasma CVD, and flame deposition, as well as physical vapor deposition (PVD). Liquid-phase methods include methods that irradiate with physical energy, such as spray pyrolysis, laser decomposition, and ultrasonic methods, as well as sol-gel methods, liquid-phase reduction, and solvothermal methods. Solid-phase methods include solid-phase pyrolysis. Among these, solvothermal methods are preferred.

[0036] In solvothermal processes, solvents such as water and ethylene glycol are used under high temperature, high pressure, or supercritical conditions. The resulting nanoparticles can be further heat-treated to reduce crystal defects.

[0037] (Persulfates) Ammonium persulfate and alkali metal salts can be used as persulfates. Examples of alkali metal salts include potassium persulfate and sodium persulfate. Persulfates may be used individually or in combination of two or more types. Persulfates may be in powder form or in aqueous solution form.

[0038] (Content of ferrite powder and persulfate) The ratio of ferrite powder to persulfate in the kit for treating organic substance-containing liquids is not particularly limited, but the content of persulfate per 100 parts by mass of ferrite powder may be in the range of 0.1 parts by mass or more and 1000 parts by mass or less.

[0039] (Co-catalyst) The co-catalyst may be, for example, metal particles or metal oxide particles. The material of the metal particles may be any of the group consisting of Au, Pd, Ag, and Pt, or an alloy of any combination thereof. The material of the metal oxide particles may be an oxide of the above metal or alloy. The surfaces of the metal particles and metal oxide particles may be covered with an oxide such as silica. Such a structure is called a core-shell structure. Examples of metal particles with a core-shell structure are Au core-silica shell particles and Ag core-silica shell particles.

[0040] There are no restrictions on the average particle size of the co-catalyst, but it can be within the range of 1 nm to 1000 nm. The particle size of the co-catalyst is the arithmetic mean of the major and minor axes of the particle in question in the SEM image. The average particle size of the co-catalyst is the arithmetic mean of the particle sizes of 100 or more metal particles.

[0041] There are no particular limitations on the content of the co-catalyst, but for example, the content of the co-catalyst relative to the total mass of the ferrite powder and the co-catalyst may be in the range of 0.2% by mass or more and 10% by mass or less.

[0042] The co-catalyst may be supported on crystalline particles of ferrite powder. As a method for supporting metal particles on the surface of crystalline particles of ferrite powder, for example, a method can be used in which ferrite particles are dispersed in a solvent containing a metal salt, and then a reducing agent is added to the solution to precipitate the metal particles on the surface of the ferrite particles. An example of a reducing agent is ethanol.

[0043] One method for supporting metal oxide particles on the surface of ferrite powder crystal particles is to disperse ferrite particles in a solvent containing an organometallic compound such as TEOS, and then precipitate the metal oxide particles on the surface of the ferrite particles by adjusting the pH of the solution or by heating and drying.

[0044] [Organic Substance-Containing Liquid Treatment Agent] An organic substance-containing liquid treatment agent according to one embodiment of the present disclosure comprises an aqueous solution of persulfate and a ferrite-based powder dispersed in the persulfate aqueous solution. The persulfate and ferrite-based powder are the same as those used in the above-described kit for treating organic substance-containing liquids. The persulfate concentration of the organic substance-containing liquid treatment agent is not particularly limited, but may be in the range of 0.1 mol / L to 50 mol / L. The ferrite-based powder content of the organic substance-containing liquid treatment agent is not particularly limited, but may be in the range of 0.1 kg / L to 10 kg / L. The ratio of ferrite-based powder to persulfate is not particularly limited, but the persulfate content per 100 parts by mass of ferrite-based powder may be in the range of 0.1 parts by mass to 1000 parts by mass.

[0045] [Method for treating organic substance-containing liquid] A method for treating organic substance-containing liquid according to one embodiment of the present disclosure is performed by irradiating a suspension obtained by mixing ferrite powder and persulfate with organic substance-containing liquid with visible light. The method for treating organic substance-containing liquid includes, for example, a preparation step, a light irradiation step, and a ferrite powder recovery step. The method for treating organic substance-containing liquid of this embodiment will be described using the above-described kit for treating organic substance-containing liquid as an example.

[0046] (Liquid containing organic substances) In this embodiment, the liquid containing organic substances to be treated is, for example, wastewater containing organic substances. The organic substances are not particularly limited, but examples include dyes, pigments, food products, oils and fats, and surfactants. The liquid containing organic substances may be industrial wastewater, household wastewater, urban wastewater, agricultural wastewater, or special wastewater. The method for treating liquid containing organic substances according to this embodiment is useful as a method for treating industrial wastewater containing a large amount of organic substances.

[0047] (Preparation Process) In the preparation process, a suspension is prepared containing an organic substance-containing liquid and ferrite powder and persulfate from a kit for treating the organic substance-containing liquid. The suspension may be prepared, for example, by placing the organic substance-containing liquid in a stirring container and adding the ferrite powder and persulfate to the organic substance-containing liquid while stirring. The persulfate added to the organic substance-containing liquid may be in powder form or aqueous solution form. There are no particular restrictions on the order in which the ferrite powder and persulfate are added. For example, ferrite powder may be added to the organic substance-containing liquid to form a suspension, and then the powder or aqueous solution of persulfate may be added. Alternatively, the powder or aqueous solution of persulfate may be added to the organic substance-containing liquid, and then the ferrite powder may be added. Furthermore, the ferrite powder and the powder or aqueous solution of persulfate may be mixed beforehand, and the resulting mixture may be added to the organic substance-containing liquid. The content of ferrite powder in the prepared suspension will vary depending on the type and concentration of the organic substance in the organic substance-containing liquid, but may be in the range of, for example, 0.1 g / L or more and 10 g / L or less. The persulfate content in the suspension may be, for example, in the range of 0.1 mmol / L to 50 mmol / L. The persulfate content in the suspension may be in the range of 0.1 parts by mass to 1000 parts by mass, with the ferrite powder content being 1 part by mass.

[0048] (Light Irradiation Step) In the light irradiation step, the suspension obtained in the preparation step is irradiated with light. The light to be irradiated may be any light that includes at least one of ultraviolet light and visible light. For example, sunlight or light from an LED lamp can be used as the light to be irradiated. The light irradiation step may also be carried out by, for example, placing the suspension obtained in the preparation step into a light-transmitting container and irradiating it with sunlight while stirring and mixing the ferrite powder and persulfate in the suspension. For example, a stirrer can be used as a means of stirring and mixing the ferrite powder and persulfate in the suspension.

[0049] In the light irradiation process, when visible light is irradiated onto the suspension, excited species such as OH radicals derived from water molecules in the suspension and sulfonate ion radicals derived from persulfates are generated on the particle surface of the ferrite powder. These excited species decompose the organic substances in the suspension. As a result, treated water is obtained in which organic substances are eliminated or their amount is reduced.

[0050] (Ferrite Powder Recovery Process) In the ferrite powder recovery process, ferrite powder contained in the suspension (treated water) after the visible light irradiation process is separated and recovered. Magnetic force can be used as a means of recovering the ferrite powder.

[0051] The recovered ferrite powder can be reused as a material for kits or agents used to treat liquids containing organic substances. The treated water from which the ferrite powder has been separated may also be discharged externally.

[0052] (Modification) Although the method for treating an organic substance-containing liquid in this embodiment has been described using a kit for treating organic substance-containing liquids as an example, the method for treating an organic substance-containing liquid in this disclosure is not limited to this embodiment.

[0053] For example, in the preparation process, an organic substance-containing liquid treatment agent may be used instead of a kit for treating organic substance-containing liquids. When using an organic substance-containing liquid treatment agent, for example, the organic substance-containing liquid can be placed in a stirring container, and the organic substance-containing liquid treatment agent can be added while stirring the organic substance-containing liquid.

[0054] Furthermore, the resolution of organic substances by ferrite powder can be improved during the visible light irradiation process. Examples of operations to improve the resolution of organic substances include applying an external field such as an electric or magnetic field (e.g., an alternating magnetic field) to the suspension, heating the suspension to raise the liquid temperature, and irradiating the suspension with ultrasound or microwaves. This increases the amount of excited species such as sulfonate ion radicals generated by the ferrite powder's reaction with OH radicals and persulfates, thereby improving the resolution of organic substances by ferrite powder and accelerating the decomposition process of organic substances.

[0055] [Information Processing Device] An information processing device according to one embodiment of the present disclosure is an information processing device that provides information for the above-described method of processing an organic substance-containing liquid, and provides information relating to ferrite powder, information relating to an organic substance-containing liquid, and information relating to the processing capacity of the ferrite powder on organic substances contained in the organic substance-containing liquid. The information relating to the ferrite powder may be one or more of the following: for example, that the powder is a ferrite powder, the type of ferrite powder (e.g., material), particle size, applicable organic substances, and applicable environment. The information relating to the organic substance-containing liquid may be one or more of the following: for example, that the organic substance is the target of processing, the type of organic substance in the organic substance-containing liquid, the type of organic substance after decomposition, concentration, properties of the liquid, and temperature of the liquid. The information relating to the processing capacity of the ferrite powder on organic substances contained in the organic substance-containing liquid may be one or more of the following: that ferrite powder is used for processing the organic substance, the effective amount used to exert the processing capacity of the ferrite powder on the organic substance, persulfate (e.g., particle size, state (powder / liquid), amount used), and light irradiation conditions (light source, wavelength, wavelength distribution, time, power). The information processing device may, for example, by inputting the type of organic substance in the organic substance-containing liquid to be processed, provide one or more pieces of information from the following: the optimal type of ferrite powder and its amount used, the concentration, temperature, persulfate, and light irradiation conditions when processing the organic substance-containing liquid. The information processing device may also provide one or more pieces of information from the following: experimental examples, specific application examples, and data sheets.

[0056] Embodiments of this disclosure are described below.

[0057] [Note 1] A method for treating an organic substance-containing liquid, comprising a treatment step of irradiating a suspension containing an organic substance-containing liquid, a ferrite-based powder, and a persulfate with light including at least one of ultraviolet light and visible light. According to the method for treating an organic substance-containing liquid in Note 1, excited species such as OH radicals and sulfonate ion radicals generated by the ferrite-based powder and persulfate decompose the organic substance in the suspension. Therefore, the organic substance in the organic substance-containing liquid can be efficiently removed.

[0058] [Note 2] The light is visible light, as described in Note 1 for the treatment of the organic substance-containing liquid. According to the treatment method for the organic substance-containing liquid in Note 2, the light irradiation state can be directly controlled by visual observation, so excited species such as OH radicals and sulfonate ion radicals can be efficiently generated.

[0059] [Note 3] The method for treating an organic substance-containing liquid according to Note 1 or 2, wherein the ferrite powder has a perovskite crystal structure, a spinel crystal structure, a hexagonal crystal structure, or a garnet crystal structure. According to the method for treating an organic substance-containing liquid according to Note 3, since the ferrite powder has the above crystal structure, excited species such as OH radicals and sulfonate ion radicals are easily generated, and the removal efficiency of organic substances is improved.

[0060] [Note 4] The method for treating an organic substance-containing liquid as described in any one of Notes 1 to 3, wherein the persulfate is one or more of sodium persulfate, potassium persulfate, and ammonium persulfate. According to the method for treating an organic substance-containing liquid as described in Note 4, the persulfate makes it easier to generate excited species such as sulfonate ion radicals, and the efficiency of organic substance removal is further improved.

[0061] [Note 5] A method for treating an organic substance-containing liquid as described in any one of Notes 1 to 4, wherein the content of ferrite powder in the suspension is in the range of 0.1 g / L to 10 g / L, and the content of persulfate in the suspension is in the range of 0.1 parts by mass to 1000 parts by mass, with 1 part by mass of ferrite powder. According to the method for treating an organic substance-containing liquid of Note 5, since the content of ferrite powder is within the above range and the content of persulfate is in the range of 0.1 parts by mass to 1000 parts by mass, with 1 part by mass of ferrite powder, the amount of excited species such as OH radicals and sulfonate ion radicals increases. Therefore, the removal efficiency of organic substances is improved.

[0062] [Note 6] A method for treating an organic substance-containing liquid according to any one of Notes 1 to 5, comprising a ferrite powder recovery step of separating and recovering the ferrite powder from the suspension after irradiation with light using magnetic force. According to the method for treating an organic substance-containing liquid in Note 6, since the ferrite powder is recovered from the suspension (treated water) after irradiation with light, the ferrite powder is less likely to be discharged to the outside.

[0063] [Note 7] A method for treating an organic substance-containing liquid as described in Note 6, further comprising a wastewater discharge step of the suspension from which the ferrite powder has been separated and recovered to the outside. According to the method for treating an organic substance-containing liquid as described in Note 7, the treated water from which the ferrite powder has been separated and recovered is discharged to the outside, thus reducing the burden on the external environment.

[0064] [Note 8] The organic substance-containing liquid is industrial wastewater. The method for treating the organic substance-containing liquid described in any one of Notes 1 to 7. According to the method for treating the organic substance-containing liquid described in Note 8, organic substances contained in industrial wastewater containing large amounts of organic substances can be removed.

[0065] [Note 9] A kit for treating organic substance-containing liquids, comprising ferrite powder and persulfate powder. According to the kit for treating organic substance-containing liquids described in Note 9, the treatment agent can be advantageously used in a method for treating organic substance-containing liquids using ferrite powder and persulfate.

[0066] [Note 10] The ferrite powder has an average primary particle size within the range of 1 nm to 1 μm, and is a kit for treating organic substance-containing liquids as described in Note 9. According to the kit for treating organic substance-containing liquids described in Note 10, the ferrite powder is finer, which makes it easier to reliably generate excited species such as OH radicals and sulfonate ion radicals, thereby improving the efficiency of organic substance removal.

[0067] [Note 11] The kit for treating organic substance-containing liquids described in Note 9 or 10, wherein the average secondary particle size of the ferrite powder is within the range of 1 μm to 10 μm. According to the kit for treating organic substance-containing liquids described in Note 11, since the average secondary particle size of the ferrite powder is within the above range, it is easy to disperse it in the organic substance-containing liquid, and it is easy to prepare a suspension in which the primary particles of the ferrite powder are uniformly dispersed. A suspension in which the primary particles are uniformly dispersed makes it easier to generate excited species such as OH radicals and sulfonate ion radicals, improving the efficiency of organic substance removal.

[0068] [Note 12] A kit for treating organic substance-containing liquids as described in any one of Notes 9 to 11, wherein the amount of persulfate per 100 parts by mass of ferrite powder is within the range of 0.1 parts by mass to 1000 parts by mass. According to the kit for treating organic substance-containing liquids of Note 12, since the ratio of persulfate to ferrite powder is within the above range, the persulfate and ferrite powder readily interact in a suspension in which they are dispersed in an organic substance-containing liquid. A suspension in which persulfate and ferrite powder readily interact readily generates excited species such as OH radicals and sulfonate ion radicals under light irradiation, thereby improving the efficiency of organic substance removal.

[0069] [Note 13] An organic substance-containing liquid treatment agent comprising a persulfate aqueous solution and a ferrite powder dispersed in the persulfate aqueous solution. According to the organic substance-containing liquid treatment agent of Note 13, the organic substance in the organic substance-containing liquid can be removed by directly adding it to the organic substance-containing liquid and irradiating the resulting mixture with light, thereby simplifying the work.

[0070] [Appendix 14] An information processing device that provides information for a method of processing an organic substance-containing liquid as described in any one of Appendices 1 to 8, the information processing device that provides information on ferrite powder, information on an organic substance-containing liquid, and information on the processing capacity of ferrite powder for organic substances contained in an organic substance-containing liquid. According to the information processing device of Appendix 14, the technical significance of processing an organic substance-containing liquid using ferrite powder can be accurately made known to users of processing agents containing ferrite powder.

[0071] (Chemicals used) Iron nitrate (Fe(NO) ３ ) ３ 9H ２ O, ≥98%), zinc nitrate (Zn(NO) ３ ) ２ 6H ２ O (98%) and rhodamine B (RhB, ≥95%) were all obtained from Sigma-Aldrich. Sodium hydroxide (NaOH, ≥97.0%) and urea (99.5%) were purchased from Kanto Chemical Co., Ltd. All reagents were used as received, and deionized water (Milipore System, 18.2Ω) was used as the solvent.

[0072] [Synthesis Example 1] (ZnFe ２ O ４ (Preparation of powder) 0.005 mol of (Zn(NO) ３ ) ２ 6H ２ O, 0.01 mol Fe(NO) ３ ) ３ 9H ２ O, 1 g of urea, and 20 mL of deionized water were mixed. Next, 30 mL of 14 M NaOH aqueous solution was added and mixed. The resulting mixture was transferred to an autoclave reactor coated on the inside with polytetrafluoroethylene and heated at 180°C for 48 hours. After cooling to room temperature, the resulting product was centrifuged, then washed with ethanol and deionized water, and finally dried in an oven at 50°C. Thus, ZnFe was obtained. ２ O ４ A powder was obtained.

[0073] (XRD measurement) ZnFe obtained ２ O４ XRD measurements were performed on the powder under the following conditions. Figure 1 shows the obtained ZnFe ２ O ４ XRD chart of powder and spinel-type ZnFe ２ O ４ This shows the standard pattern for JCPDS (card number: #22-1012). Equipment used: Rigaku MiniFlex Method: 2θ-θ reflection method X-rays used: Cu-Kα rays Scan speed: 1.00° / min Sampling interval: 0.10° Slit width: DS: (variable), SS: 4.2°, RS: 0.3 mm

[0074] From the XRD chart in Figure 1, the ZnFe obtained in synthesis example 1 ２ O ４ The powder is spinel-type ZnFe ２ O ４ It was confirmed to be a ferrite-based powder.

[0075] (SEM and TEM observation) Obtained ZnFe ２ O ４ The powder was observed using an SEM (SU4300SE, Hitachi High-Tech Corporation). Figures 2A and 2B show the obtained ZnFe ２ O ４ The image shows an SEM photograph of the powder. From the SEM photograph, ZnFe ２ O ４ The powder was confirmed to be composed of crystalline particles. The particle size of 100 secondary particles was also measured. The result showed that the secondary particle size was approximately 10 nm. Furthermore, observation was performed using a TEM (JEM-ARM200FTH, JEOL Ltd.). Figures 3A and 3B show the obtained ZnFe. ２ O ４ The TEM image of the powder is shown. Measurements of the particle size of 100 primary particles revealed that the primary particle size was approximately 5 nm.

[0076] [Example 1] (Treatment of organic substance-containing liquid) As the organic substance-containing liquid, an aqueous RhB solution (concentration: 0.3 mM) in which RhB is dissolved in water was used, and ZnFe ２ O ４ The decomposition of organic substances by the powder and persulfate was evaluated. 40 mg of ZnFe was added to 20 mL of RhB aqueous solution. ２ O ４A suspension of RhB was prepared by simultaneously adding the powder and sodium persulfate in an amount that resulted in a persulfate concentration of 10 mM. Then, 4 mW / mm² of phosphate was added to the RhB suspension. ２ The mixture was irradiated with visible light. Every two hours from the start of stirring, 0.2 mL of the RhB suspension was collected as a sample for RhB concentration measurement. The collected RhB concentration measurement samples were centrifuged, and the supernatant liquid free of solid particles was collected. The absorbance of the supernatant liquid at λ = 555 nm was measured using a UV-vis spectrometer (UV-2600i, Shimadzu Corporation). The obtained absorbance was measured using C ｔ Let C be the absorbance of the RhB aqueous solution at λ = 555 nm. ０ As absorbance C ０ Absorbance C ｔ ratio C ｔ / C ０ The following was calculated. In Figure 4, the horizontal axis is the stirring time and the vertical axis is C ｔ / C ０ The graph plotted as follows is shown.

[0077] [Example 2] In the treatment of the organic substance-containing liquid described above, an RhB suspension was prepared in the same manner as in Example 1, except that the concentration of sodium persulfate added to the RhB aqueous solution was 40 mM. The suspension was then stirred at a rotational speed of 600 rpm using a stirrer tip to extract the ZnFe from the RhB suspension. ２ O ４ The powder was dispersed. Every two hours from the start of stirring, 0.2 mL of the RhB suspension was taken as a sample for measuring the RhB concentration, and C ｔ / C ０ The following was calculated. In Figure 4, the horizontal axis is the stirring time and the vertical axis is C ｔ / C ０ The graph plotted as follows is shown.

[0078] [Comparative Example 1] In the treatment of the above organic substance-containing liquid, 40 mg of ZnFe was added to the RhB aqueous solution. ２ O ４ An RhB suspension was prepared in the same manner as in Example 1, except that powder was added but sodium persulfate was not, and the suspension was irradiated with visible light. Every two hours from the start of stirring, 0.2 mL of the RhB suspension was taken as a sample for RhB concentration measurement, and C ｔ / C ０The following was calculated. In Figure 4, the horizontal axis is the stirring time and the vertical axis is C ｔ / C ０ The graph plotted as follows is shown.

[0079] From the results in Figure 4, Examples 1 and 2 show a C-12 ratio of residual RhB in the RhB suspension compared to Comparative Example 1. ｔ / C ０ The slope is large, and C occurs in a short time. ｔ / C ０ The decrease indicates a high RhB degradation capacity. This is because ZnFe under visible light irradiation ２ O ４ This is because excited species such as OH radicals and sulfonate ion radicals, generated by the reaction of the powder and persulfate, decomposed the RhB in the RhB suspension.

[0080] [Addendum] The use of the ferrite powder and persulfate composition described herein for wastewater treatment offers higher energy efficiency and more stable wastewater treatment compared to photocatalysts such as titanium dioxide. Therefore, it can contribute to Goal 9 of the United Nations-led Sustainable Development Goals (SDGs). Goal 9: "Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation."

Claims

1. A method for treating an organic substance-containing liquid, comprising a treatment step of irradiating a suspension containing the organic substance-containing liquid, a ferrite-based powder, and a persulfate with light including at least one of ultraviolet light and visible light.

2. The method for treating an organic substance-containing liquid according to claim 1, wherein the light is visible light.

3. The method for treating an organic substance-containing liquid according to claim 1 or 2, wherein the ferrite powder has a perovskite crystal structure, a spinel crystal structure, a hexagonal crystal structure, or a garnet crystal structure.

4. The method for treating an organic substance-containing liquid according to claim 1 or 2, wherein the persulfate is one or more of sodium persulfate, potassium persulfate, and ammonium persulfate.

5. The method for treating an organic substance-containing liquid according to claim 1 or 2, wherein the content of the ferrite powder in the suspension is in the range of 0.1 g / L to 10 g / L, and the content of the persulfate in the suspension is in the range of 0.1 mmol / L to 50 mmol / L.

6. A method for treating an organic substance-containing liquid according to claim 1 or 2, comprising a ferrite powder recovery step of separating and recovering the ferrite powder from the suspension after irradiation with the light by magnetic force.

7. The method for treating an organic substance-containing liquid according to claim 6, further comprising a wastewater step of draining the suspension from which the ferrite powder has been separated and recovered to the outside.

8. The method for treating an organic substance-containing liquid according to claim 1 or 2, wherein the organic substance-containing liquid is industrial wastewater.

9. A kit for treating organic substance-containing liquids, comprising ferrite powder and persulfate.

10. The kit for treating organic substance-containing liquids according to claim 9, wherein the average primary particle size of the ferrite powder is in the range of 1 nm to 1 μm.

11. The kit for treating organic substance-containing liquids according to claim 9, wherein the average secondary particle size of the ferrite powder is within the range of 1 μm to 10 μm.

12. An organic substance-containing liquid treatment agent comprising an aqueous persulfate solution and a ferrite-based powder dispersed in the aqueous persulfate solution.

13. An information processing apparatus that provides information for a method of processing an organic substance-containing liquid according to claim 1 or 2, the apparatus providing information relating to the ferrite powder, information relating to the organic substance-containing liquid, and information relating to the processing capacity of the ferrite powder for the organic substance contained in the organic substance-containing liquid.

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