Pollutant repairing material and preparation method and application thereof

Abstract

The invention discloses a material for pollutant remediation as well as a preparation method and application thereof. The preparation method of the material for pollutant remediation comprises the following steps: S1, dissolving soluble carbonate in an anaerobic first solvent to form a solution A, and dissolving soluble ferrite and a reductive protective agent in an anaerobic second solvent to form a solution B; s2, adding the solution A into the solution B, adjusting the pH value to 6-8 to obtain a solution C, and adding a stabilizer and an anaerobic medium into the solution C to form a solution D; s3, standing the solution D under a dark condition at normal temperature for 6-12 hours to obtain a solution E; s4, performing first centrifugal treatment on the solution E to obtain a product F; and S5, dissolving the product F in a flocculant solution, stirring, standing under an anaerobic and dark condition, and carrying out second centrifugal treatment and air drying treatment to obtain the material for pollutant remediation. The material for pollutant remediation has strong reducibility, can react with various heavy metals to reduce the toxicity of the heavy metals, and is suitable for remediation of soil and water pollution.

Description

Technical Field

[0001] This invention belongs to the field of pollutant remediation technology, and in particular relates to a material for pollutant remediation, its preparation method, and its application. Background Technology

[0002] With economic development, my country is placing increasing emphasis on ecological civilization, and environmental protection and pollution control have become key national priorities. To better remediate pollutants, remediation materials with functions such as heavy metal passivation and organic matter decomposition are gaining attention.

[0003] Because divalent Fe has high reducing activity, it can generate a large number of reactive oxygen species, such as ·OH and ·O2, through the Fenton reaction. -The oxidation and degradation of pollutants, such as Fe2O2 and H2O2, are promoted by the oxidation of Fe2O3. Based on this principle, remediation materials with divalent Fe as their core have begun to receive significant attention. Siderite is a widely distributed mineral, its main component being FeCO3, which is one of the main forms of divalent Fe in nature. Therefore, using siderite as a soil and water pollution remediation material is a common practice. For example, a method for removing arsenic from waste acid using siderite as an in-situ iron source (patent application number: 202110186839.9) describes the use of natural siderite to treat arsenic in waste acid, oxidizing highly toxic trivalent arsenic to pentavalent arsenic, thereby reducing the toxicity of arsenic. A method for preparing Fe / C composite porous materials using sedimentary siderite (patent application number: 201610326853.3) describes the preparation of Fe / C composite porous materials with high open porosity, high magnetic susceptibility, high adsorption, and high biochemical activity by mixing and molding low-grade sedimentary siderite and biomass powder, followed by pyrolysis under a high-temperature reducing atmosphere. This material can serve as an important material for environmental pollution remediation. A method for preparing and applying a siderite-based material for simultaneous nitrogen and phosphorus removal (patent application number: 201410063868.6) describes the preparation of porous granular materials with high particle strength, high porosity, large specific surface area, and high microbial loading by adding binders and pore-forming agents in a certain proportion using siderite as raw material. This material is used to treat eutrophication of water bodies. The above methods mostly utilize natural siderite or a mixture of other materials to prepare porous materials using specific methods. Their removal of environmental pollutants primarily relies on the adsorption capacity of divalent Fe. However, natural siderite has high crystallinity, resulting in low ·OH formation on its mineral surface and low adsorption capacity for divalent Fe. Therefore, existing methods using natural siderite as raw material have relatively low remediation effects on environmental pollutants such as As and organic matter. Currently, the mainstream method for artificially synthesizing FeCO3 is the high-temperature, high-pressure hydrothermal method, typically using temperatures between 160 and 200°C. This method produces siderite with high purity, good crystal properties, and stable characteristics, making it less susceptible to oxidation in air. While this method can improve remediation performance to some extent, the preparation process requires complex procedures such as high-temperature and aging treatments, resulting in high costs. Furthermore, it is limited by the crystal growth mechanism, which restricts the adsorption of Fe. 2+ The exposure of active sites is still insufficient, resulting in limited improvement in repair performance.

[0004] Therefore, developing low-cost, high-performance divalent Fe-based repair materials remains a key research focus. Summary of the Invention

[0005] In view of the above problems, the purpose of this invention is to provide a material for pollutant remediation, its preparation method and application. The preparation process of this pollutant remediation material is carried out at room temperature throughout, with low energy consumption, strong reducing properties, and can react with a variety of heavy metals to reduce heavy metal toxicity. It is suitable for the synergistic treatment of heavy metals / organic pollutants in soil and water.

[0006] To achieve the above objectives, the first aspect of the present invention provides a method for preparing a material for pollutant remediation, comprising the following steps: S1, dissolving a soluble carbonate in an oxygen-free first solvent to form solution A; and dissolving a soluble ferrous salt and a reducing protective agent in an oxygen-free second solvent to form solution B; S2, adding solution A to solution B, adjusting the pH to 6-8 to obtain solution C, and then adding a stabilizer and an oxygen-free medium to solution C to form solution D; S3, placing solution D under light-proof conditions at room temperature for 6-12 h to obtain solution E; S4, removing the supernatant from solution E after a first centrifugation treatment to obtain product F; S5, dissolving a flocculant in an oxygen-free third solvent to form a flocculant solution, then dissolving product F in the flocculant solution, stirring, and then placing it under oxygen-free and light-proof conditions, followed by a second centrifugation treatment and air drying to obtain the material for pollutant remediation; the first solvent, the second solvent, and the third solvent are all water.

[0007] Compared with existing technologies, this method effectively prevents Fe from oxidizing through an oxygen-free and light-protected environment and a reducing agent. 2+ Oxidation ensures that iron participates in the reaction in the form of ferrous iron. Simultaneously, the room-temperature reaction conditions significantly reduce ion diffusion and crystallization rates, making the nucleus formation rate much higher than the crystal growth rate, thus promoting the formation of numerous defect-rich metastable nuclei. The 6-12 hour settling process achieves non-equilibrium crystallization, promoting the formation of fine grains and increasing lattice defects, ultimately yielding low-crystallinity FeCO3. Furthermore, controlling the pH value within the range of 6-8 avoids the dissolution of FeCO3 under strongly acidic conditions and prevents the formation of Fe(OH)2 impurities under strongly alkaline conditions. The addition of a stabilizer further ensures pH stability during the reaction, preventing increased crystallinity or product impurity due to pH fluctuations. The flocculant forms an organic coating layer on the FeCO3 surface, extending its shelf life. Therefore, the preparation method of this invention achieves low crystallinity of FeCO3 through an oxygen-free and light-protected environment, room-temperature settling reaction, and pH control, resulting in FeCO3 with high crystallinity. 2+ The active sites are fully exposed, making it easier to adsorb and reduce heavy metals.

[0008] Furthermore, the soluble carbonate of the present invention is sodium carbonate; the soluble ferrous salt is at least one of ferrous sulfate and ferrous chloride.

[0009] Furthermore, the reducing protective agent of the present invention is ascorbic acid or lemon juice.

[0010] Furthermore, the stabilizer of this invention is sodium benzoate. Sodium benzoate can stabilize the pH of the solution. Sodium benzoate can react with both acids and bases, allowing the pH change during product preparation to be kept within a controllable range, which is beneficial for product formation. At the same time, sodium benzoate can also protect ferrous ions, preventing them from being easily oxidized to ferric ions. In addition, under specific conditions, sodium benzoate can react with reducing protective agents (such as ascorbic acid) to weaken the reducing power of ascorbic acid. Therefore, by pre-consuming some ascorbic acid with sodium benzoate, the activity of the pollutant remediation material is prevented from experiencing a "burst release-sudden drop" phenomenon when exposed to strong light and high temperature environments during use.

[0011] Furthermore, the oxygen-isolating medium of the present invention is vegetable oil, which includes at least one of peanut oil, sesame oil, castor oil and tung oil.

[0012] Furthermore, the flocculant of the present invention is polyacrylamide.

[0013] Further, in step S1 of the present invention, the mass ratio of soluble carbonate to the first solvent is 0.5 to 1.5:20; for example, the mass ratio of soluble carbonate to the first solvent may be, but is not limited to, 0.5:20, 0.7:20, 0.9:20, 1.1:20, 1.3:20, or 1.5:20; preferably, the mass ratio of soluble carbonate to the first solvent is 1:20.

[0014] Further, in step S1 of the present invention, the mass ratio of the soluble ferrous salt, the reducing protective agent, and the second solvent is 0.5~1.5:1.5~2.5:22; for example, the mass ratio of the soluble ferrous salt, the reducing protective agent, and the second solvent may be, but is not limited to, 0.5:1.5:22, 1:2:22, 1.5:2:22, or 1.5:2.5:22; the preferred mass ratio of the soluble ferrous salt, the reducing protective agent, and the second solvent is 1:2:22.

[0015] Further, in step S2 of the present invention, the mass ratio of solution A to solution B is 0.5~1.5:0.5~1.5; specifically, the mass ratio of solution A to solution B can be, but is not limited to, 0.5:1, 0.7:1.2, 1:1, 1:1.3, or 1.3:1.5. Preferably, the mass ratio of solution A to solution B is 1:1.

[0016] Furthermore, in step S2 of the present invention, dilute sulfuric acid, dilute hydrochloric acid, potassium hydroxide, or sodium hydroxide can be used to adjust the pH value.

[0017] Furthermore, in step S3 of the present invention, the room temperature is specifically 20~30℃.

[0018] Furthermore, the preparation of the first oxygen-free solvent, the second oxygen-free solvent, and the third oxygen-free solvent of the present invention is as follows: boiling distilled water and then cooling it in the absence of air.

[0019] Further, the mass ratio of the stabilizer to solution C in this invention is 0.5 to 1.5:50; specifically, the mass ratio of the stabilizer to solution C can be, but is not limited to, 0.5:50, 0.8:50, 1:50, 1.2:50, or 1.5:50; preferably, the mass ratio of the stabilizer to solution C is 1:50.

[0020] Further, the mass ratio of the oxygen-isolating medium to solution C in this invention is 0.5~1.5:100; specifically, the mass ratio of the oxygen-isolating medium to solution C can be, but is not limited to, 0.5:100, 0.8:100, 1:100, 1.2:100, and 1.5:100. Preferably, the mass ratio of the oxygen-isolating medium to solution C is 1:100.

[0021] Furthermore, the conditions for the first centrifugation treatment and the second centrifugation treatment of the present invention are each independently as follows: Centrifuge at 3000-5000 rpm for 5-10 minutes.

[0022] Further, the mass ratio of the flocculant to the third solvent in this invention is 1:50 to 100; for example, the mass ratio of the flocculant to the third solvent may be, but is not limited to, 1:50, 1:70, 1:80, 1:90, or 1:100. Preferably, the mass ratio of the flocculant to the third solvent is 1:00. Specifically, the flocculant is acrylamide.

[0023] Furthermore, the mass ratio of product F to flocculant solution in this invention is 1:5 to 20. Specifically, the mass ratio of product F to flocculant solution can be, but is not limited to, 1:5, 1:10, 1:15, or 1:20.

[0024] Furthermore, step S5 of the present invention includes allowing the mixture to stand for 0.5 to 1 hour under oxygen-free and light-protected conditions. Specifically, the air-drying process involves air-drying at room temperature in the absence of air.

[0025] Furthermore, the pollutant remediation material prepared in step S5 of the present invention must be stored in an oxygen-free, light-proof, and temperature-controlled environment to maximize the material's activity. That is, the pollutant remediation material must not be exposed to air for a long time, must not be exposed to strong light, or must not be exposed to high temperature environments for a long time.

[0026] Accordingly, a second aspect of the present invention provides a material for pollutant remediation, which is prepared by the aforementioned method for preparing pollutant remediation materials.

[0027] Accordingly, a third aspect of the present invention provides a method for preparing a pollutant remediation material, the application of which is used in soil or water pollution remediation. This pollutant remediation material, due to its low crystallinity, has Fe... 2+ With active sites fully exposed, heavy metals and organic pollutants can be removed efficiently.

[0028] Furthermore, the pollutant remediation material of the present invention is suitable for the remediation of water pollution, especially for water containing heavy metal pollutants such as As and Cr. The pollutant remediation material is directly added to the polluted water. If necessary, an aeration device can be added to expose the liquid to air and allow it to fully contact with oxygen, utilizing the Fe on the surface of the pollutant remediation material. 2+ The Fenton reaction causes heavy metals (such as As) to undergo a reaction. 3+ →As 5+ Cr 6+ →Cr 3+ It can be transformed into a low-toxicity or poorly soluble form.

[0029] Furthermore, the pollutant remediation material of the present invention is also applicable to the remediation of soil pollution. The pollutant remediation material needs to be dissolved in an aqueous solution containing 1% potassium dihydrogen phosphate and sprayed onto the soil when the temperature is relatively low during the day. Attached Figure Description

[0030] Figure 1 The image shows the elemental distribution analysis of the pollutant remediation materials prepared in Example 1 and Comparative Examples 1 to 2.

[0031] Figure 2 The X-ray diffraction patterns are of the pollutant remediation materials prepared in Example 1 and Comparative Examples 1 to 2.

[0032] Figure 3 The images are scanning electron microscope (SEM) images of the pollutant remediation materials prepared in Example 1 and Comparative Examples 1 to 2.

[0033] Figure 4 Transmission electron microscopy (TEM) images of the pollutant remediation materials prepared in Example 1 and Comparative Examples 1 to 2.

[0034] Figure 5 The graph shows the relationship between the cumulative amount of •OH generated by the pollutant remediation materials prepared in Example 1 and Comparative Examples 1 to 2 and the change over time. Detailed Implementation

[0035] To better illustrate the purpose, technical solution, and beneficial effects of this invention, the invention will be further described below in conjunction with specific embodiments and accompanying drawings. It should be noted that the methods described below are further explanations of this invention and should not be construed as limiting it.

[0036] Example 1 This embodiment provides a material for pollutant remediation, the preparation steps of which include: S1. Dissolve sodium carbonate in boiling, then cooled in the absence of air to form solution A at a mass ratio of 1:20; and dissolve ferrous sulfate and ascorbic acid in boiling, then cooled in the absence of air to form solution B, wherein the mass ratio of ferrous sulfate, ascorbic acid and distilled water is 1:2:22. S2. Slowly add solution A to solution B at a mass ratio of 1:1. Adjust the pH to 7 with sodium hydroxide to obtain solution C. Then add sodium benzoate to solution C, stir for 1 minute, and then add peanut oil to form solution D. The mass ratio of sodium benzoate to solution C is 1:50, and the mass ratio of peanut oil to solution C is 1:100. S3. Place solution D in the dark (isolate from light) and let it stand at 25°C for 6 hours to obtain solution E; S4. After centrifuging solution E at 5000 rpm for 5 min, remove the supernatant to obtain product F; S5. Dissolve the flocculant in boiling, air-isolated, and cooled distilled water at a mass ratio of 1:100 to form a flocculant solution. Then dissolve product F in the flocculant solution at a mass ratio of 1:10. After stirring, let it stand in the dark for 1 hour in the absence of air. Then centrifuge at 5000 rpm for 10 minutes, remove the supernatant, and air dry at room temperature in the absence of air to obtain the pollutant remediation material.

[0037] Example 2 This embodiment provides a material for pollutant remediation, the preparation steps of which include: S1. Sodium carbonate is dissolved in boiling and then cooled in the absence of air to form solution A at a mass ratio of 0.7:20; and ferrous chloride and ascorbic acid are dissolved in boiling and then cooled in the absence of air to form solution B, with the mass ratio of ferrous chloride, ascorbic acid and distilled water being 0.8:2.2:22. S2. Slowly add solution A to solution B at a mass ratio of 0.8:1. Adjust the pH to 7.2 with sodium hydroxide to obtain solution C. Then add sodium benzoate to solution C, stir for 2 minutes, and then add peanut oil to form solution D. The mass ratio of sodium benzoate to solution C is 0.8:50, and the mass ratio of peanut oil to solution C is 1.2:100. S3. Place solution D in the dark (isolate from light) and let it stand at 28°C for 8 hours to obtain solution E; S4. After centrifuging solution E at 4000 rpm for 8 min, remove the supernatant to obtain product F; S5. Dissolve the flocculant in boiling, air-isolated, and cooled distilled water at a mass ratio of 1:90 to form a flocculant solution. Then, dissolve product F in the flocculant solution at a mass ratio of 1:5. After stirring, let it stand in the dark for 0.8 hours in the absence of air. Then, centrifuge at 3000 rpm for 10 minutes, remove the supernatant, and air-dry at room temperature in the absence of air to obtain the pollutant remediation material.

[0038] Example 3 This embodiment provides a material for pollutant remediation, the preparation steps of which include: S1. Sodium carbonate is dissolved in boiling and then cooled in the absence of air to form solution A at a mass ratio of 1.2:20; and ferrous chloride and ascorbic acid are dissolved in boiling and then cooled in the absence of air to form solution B, with the mass ratio of ferrous chloride, ascorbic acid and distilled water being 1.2:1.8:22. S2. Slowly add solution A to solution B at a mass ratio of 0.9:1.2. Adjust the pH to 6.8 with dilute hydrochloric acid to obtain solution C. Then add sodium benzoate to solution C, stir for 2 minutes, and then add castor oil to form solution D. The mass ratio of sodium benzoate to solution C is 1.2:50, and the mass ratio of castor oil to solution C is 0.8:100. S3. Place solution D in the dark (isolate from light) and let it stand at 22°C for 11 hours to obtain solution E; S4. Centrifuge solution E at 3000 rpm for 10 min and remove the supernatant to obtain product F; S5. Dissolve the flocculant in boiling, air-isolated, and cooled distilled water at a mass ratio of 1:80 to form a flocculant solution. Then, dissolve product F in the flocculant solution at a mass ratio of 1:20. After stirring, let it stand in the dark for 0.6 hours in the absence of air. Then, centrifuge at 4000 rpm for 7 minutes, remove the supernatant, and air-dry at room temperature in the absence of air to obtain the pollutant remediation material.

[0039] Comparative Example 1 This comparative example is basically the same as Example 1, except that step S3 of Comparative Example 1 is: placing solution D in the dark (isolated from light) and letting it stand at 80°C for 6 hours to obtain solution E.

[0040] Comparative Example 2 This comparative example is basically the same as Example 1. The only difference between the two is that step S3 of Comparative Example 2 is: placing solution D in the dark (isolated from light) and letting it stand at 130°C for 6 hours to obtain solution E.

[0041] The pollutant remediation materials prepared in Example 1 and Comparative Examples 1-2 were subjected to elemental distribution analysis, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy analysis according to the following methods. The pollutant remediation material of Example 1 is designated as product a, the pollutant remediation material of Comparative Example 1 as product b, and the pollutant remediation material of Comparative Example 2 as product c. The elemental distribution analysis results are as follows: Figure 1 As shown, the X-ray diffraction results are as follows: Figure 2 As shown; Scanning electron microscopy results are as follows Figure 3 As shown; the transmission electron microscopy analysis results are as follows: Figure 4 As shown.

[0042] Elemental distribution analysis: The distribution of Fe, O, and C elements in the sample was determined using EDS mapping with EDAX's Genesis instrument. A small amount of anhydrous ethanol was added to a small amount of powder sample and ultrasonically dispersed. The suspension was then added to an ultrathin carbon / copper mesh, and the ethanol was allowed to dry naturally before testing. Ultrasonic dispersion was performed because the sample particles were too large for the electron beam emitted by the instrument to penetrate, thus requiring ultrasonic fragmentation to observe the morphology and lattice fringes at the thinner edges of the sample fragments.

[0043] X-ray diffraction test: The crystal structure of the samples was determined using a BRUKER D8 ADVANCE X-ray polycrystalline diffractometer. Cu Kα rays and a ceramic X-ray tube were used at 40 kV and 40 mA. A glass slide was used as the sample testing platform, with a scanning range of 5–80° and a scanning step of 0.02°. A small amount of dry powder sample was pressed into the groove of the glass slide on the testing platform and then placed into the instrument for testing. The test results were analyzed using MDI Jade software. XRD primarily uses X-ray diffraction phenomena for phase analysis and crystal structure research. Based on the specific diffraction peaks produced by a substance, corresponding to fixed unit cell parameters, the crystalline phase or mineral type of the substance can be identified based on the diffraction peak data.

[0044] Scanning electron microscopy observation: The microstructure of the material was observed using a ZEISS Ultra 55 field emission scanning electron microscope (FESEM). The voltage ranged from 2 to 5 kV, depending on the sample size and observation requirements. Due to the weak magnetism of the SFM, a thin layer of carbon paste was applied to the sample stage to better fix the sample and prevent damage to the instrument from the magnetic sample. A small amount of dry powder was then sprinkled on the carbon paste, and a gold film was sprayed onto the surface to improve the conductivity of the sample and obtain clearer, more aesthetically pleasing images. Finally, the sample was placed in the instrument's sample chamber for testing and observation.

[0045] Transmission electron microscopy analysis: The morphology of the SFM sample was further observed and its lattice fringes were analyzed using a FEI Tecnai G2 F30 transmission electron microscope (TEM) with an accelerating voltage of 200 kV.

[0046] from Figure 1 It can be seen that the distribution of Fe, O and C elements in products a, b and c is relatively uniform and consistent, indicating that FeCO3 was generated by the preparation methods of Example 1 and Comparative Examples 1-2.

[0047] from Figure 2 It can be seen that product c exhibits obvious diffraction peaks at 24.8°, 32°, 38.3°, 42.3°, 46.1°, 52.7°, and 61.5°. Its main diffraction peaks correspond to planes (012), (104), (110), (113), (202), (018), (116), and (122) in the siderite standard PDF card (PDF # 83-1764), indicating that the iron carbonate contained in the pollutant remediation material generated at 130°C has essentially the same properties as siderite. Product b exhibits obvious diffraction peaks at 24.8° and 52.7°, with some overlap with product c, indicating that b has some crystallization, but the degree of crystallinity is lower than that of c. Product a, however, has no obvious diffraction peaks, indicating that the preparation method of this invention can obtain FeCO3 with low crystallinity.

[0048] from Figure 3 It can be seen that product a is mainly composed of small particle aggregates, product b exhibits a loose aggregate system with obvious loose pores, and product c has a distinct microspherical structure. Scanning electron microscopy images further demonstrate that products a and c are structurally significantly different, namely, the room temperature reaction conditions significantly reduced the ion diffusion and crystallization rates, making the crystal nucleus formation rate much higher than the crystal growth rate, thus promoting the formation of a large number of defect-rich metastable crystal nuclei in the system.

[0049] from Figure 4 It can be seen that product a shows obvious siderite lattice patterns, product b has slight lattice patterns, and product c has clearly visible siderite lattice patterns. This indicates that the pollutant remediation material prepared by the method of the present invention has low crystallinity; while the pollutant remediation material generated at high temperature of 130℃ has high crystallinity and strong stability.

[0050] The •OH generation capacity of the pollutant remediation materials of Examples 1-3 and Comparative Examples 1-2 was tested according to the following method. The test results are shown in Table 1. The relationship between the cumulative •OH generation of the pollutant remediation materials of Examples 1 and Comparative Examples 1-2 and time is shown in the graph. Figure 5As shown; the pollutant remediation material of Example 1 is designated as product a, the pollutant remediation material of Comparative Example 1 is designated as product b, and the pollutant remediation material of Comparative Example 2 is designated as product c.

[0051] •OH capacity testing methods: Take 0.5 g of the product and dissolve it in 100 mL of a solution containing 0.1 mM methyl phenyl sulfoxide (PMSO) and 10 mM MES buffer. Protect from light but not air, and shake in a constant temperature shaker at 25 ± 2 °C at 220 rpm. After 48 h, take 1.0 mL of the suspension, filter it through a 0.22 μm filter membrane, and collect it in a brown liquid chromatography vial. Add 50 μL of ethanol to terminate the reaction. Then, use a high-performance liquid chromatograph (HPLC, SPD-16, Shimazu, Japan) to accurately determine the concentration of p-hydroxybenzoic acid in the solution. The determination conditions are: mobile phase: methanol:0.1% acetic acid = 1:1, flow rate: 1 mL / min, column temperature: 35 °C, reverse-phase C18 column, and detection wavelength: 255 nm. Based on the known conversion coefficient of 5.87, the cumulative concentration of •OH produced can be further deduced.

[0052] Table 1

[0053] In an aerobic environment, products with stronger reducing properties generate a larger amount of •OH. Therefore, •OH is used to characterize the reducing properties of the contaminant remediation materials in the examples and comparative examples. (From Table 1 and...) Figure 5 It can be seen that product a has the largest •OH content, followed by product b, and product c has the smallest. This indicates that product a has a higher specific surface area and surface active sites. This also shows that the pollutant remediation material generated by the preparation method of this invention is more likely to adsorb and reduce heavy metals such as As and Cr, thereby reducing the toxicity of heavy metals and achieving the purpose of remediating heavy metal pollution.

[0054] In summary, the preparation method for pollutant remediation materials provided by this invention has the following significant advantages: First, this invention uses ferrous sulfate, sodium carbonate, ascorbic acid, polyacrylamide, etc., as raw materials, which are readily available and the process is simple; second, the entire preparation process does not require heat treatment, resulting in lower energy consumption compared to traditional methods; third, the pollutant remediation material has low crystallinity and higher Fe content. 2+ With active sites and high reducing power, it can efficiently reduce various heavy metals such as As and Cr, thereby reducing heavy metal toxicity. Finally, the addition of sodium benzoate stabilizer and flocculant ensures that the pollutant remediation material maintains excellent stability during storage and use, guaranteeing long-term remediation effects.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a material for pollutant remediation, characterized in that the steps include... include: S1. Dissolve the soluble carbonate in an oxygen-free first solvent to form solution A; And dissolve the soluble ferrous salt and the reducing protective agent in an oxygen-free second solvent to form solution B; S2. Add solution A to solution B, adjust the pH to 6-8 to obtain solution C, and then add a stabilizer and an oxygen-free medium to solution C to form solution D; S3. Place the solution D under light-protected conditions and let it stand at room temperature for 6-12 hours to obtain solution E; S4. After centrifugation of the solution E, the supernatant is removed to obtain product F; S5. Dissolve the flocculant in an oxygen-free third solvent to form a flocculant solution, then dissolve the product F in the flocculant solution, stir, and let it stand under oxygen-free and light-proof conditions, and then perform a second centrifugation treatment and air drying treatment to obtain the pollutant remediation material. The first solvent, the second solvent, and the third solvent are all water.

2. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The soluble carbonate is sodium carbonate; the soluble ferrous salt is at least one of ferrous sulfate and ferrous chloride.

3. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The reducing protective agent is ascorbic acid or lemon juice.

4. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The stabilizer is sodium benzoate.

5. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The oxygen-free medium is vegetable oil, which includes at least one of peanut oil, sesame oil, castor oil, and tung oil.

6. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The flocculant is polyacrylamide.

7. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The mass ratio of the soluble carbonate to the first solvent is 0.5~1.5:20; the mass ratio of the soluble ferrous salt, the reducing protective agent, and the second solvent is 0.5~1.5:1.5~2.5:22; and the mass ratio of solution A to solution B is 0.5~1.5:0.5~1.

5.

8. The method for preparing the pollutant remediation material as described in claim 1, characterized in that, The mass ratio of the stabilizer to the solution C is 0.5~1.5:50; the mass ratio of the oxygen-free medium to the solution C is 0.5~1.5:

100.

9. A material for pollutant remediation, characterized in that, It is prepared by the method for preparing pollutant remediation materials as described in any one of claims 1 to 8.

10. The application of a pollutant remediation material prepared by the method of any one of claims 1 to 8 in soil pollution remediation or water pollution remediation.

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