Silane coupling agent modified coal gangue chelated metal composite catalytic material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of catalytic materials, and relates to a silane coupling agent modified coal gangue chelated metal composite catalytic material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing coal gangue with deionized water, and carrying out ultrasonic treatment to obtain a coal gangue dispersion liquid; preparing a coupling agent, deionized water and an ethanol solution into hydrolysate, and heating in an oil bath to obtain coupling agent hydrolysate; mixing the coal gangue dispersion liquid with the coupling agent hydrolysate, heating in an oil bath, condensing, refluxing, carrying out suction filtration, washing, drying and grinding to obtain coal gangue composite material powder with chelating capacity; mixing the coal gangue composite material powder with a metal salt solution, dipping, stirring, drying, washing and grinding to obtain the silane coupling agent modified coal gangue chelated metal composite catalytic material. According to the composite material, stable immobilization of metal active sites is achieved through chelation of amino groups on the surface, peroxide can be effectively activated to generate free radicals, and the degradation efficiency of organic pollutants in a water body is remarkably improved under the adsorption-catalysis synergistic effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of catalytic materials, and particularly relates to a silane coupling agent modified coal gangue chelated metal composite catalytic material and a preparation method and application thereof. BACKGROUND

[0002] Norfloxacin (NOR) is a commonly used antibiotic, widely used in medical treatment and animal husbandry, but its residues in the environment can lead to an increase in microbial drug resistance. Due to the wide use of NOR, the problem of its residues in water bodies is becoming increasingly serious, posing a potential threat to the ecosystem and human health. As the understanding of the environmental hazards of NOR and other antibiotics deepens, many countries and regions have begun to develop relevant environmental quality standards and emission standards to limit the content of NOR in the environment, promoting the research of degradation technology. In order to achieve sustainable development of the ecological environment, it is necessary to effectively solve the pollution problem of NOR and other antibiotics, develop efficient degradation technology, and protect the quality of the environment such as water and soil. Therefore, it is of great significance to develop an effective treatment technology and material to solve this problem.

[0003] At present, the degradation of NOR mainly includes biological degradation, physical degradation and advanced oxidation degradation. Biological degradation is to consume NOR through the physiological activity of microorganisms, and physical degradation is to remove norfloxacin through adsorption or radiation, etc. Both of these two methods have limitations such as long degradation period, high cost and complex process. The advanced oxidation technology based on sulfate can produce reactive oxygen species (ROS) such as sulfate radical (SO4 •- ), hydroxyl radical (·OH), superoxide radical (O2 •- ) and singlet oxygen ( 1 O2) by activating persulfate (permonosulfate (PMS) and perdisulfate (PDS)) to degrade NOR. However, pure PMS cannot effectively self-decompose to produce ROS, and catalyst materials are needed to promote the production of ROS. Among the many reported catalyst materials, industrial waste catalyst materials are widely concerned due to their wide raw material sources and low cost. Using industrial waste materials as catalyst carriers has significant environmental and economic benefits, and is in line with the concept of sustainable development, and has broad application prospects in the field of resource recycling.

[0004] Coal gangue (CG) is a typical industrial waste, which is widely available and in large quantities. The chemical composition of CG contains various metal elements such as aluminum, silicon, iron and titanium, which have certain catalytic activity or can act as co-catalysts to produce synergistic effects with the loaded active components, enhancing the overall activity and selectivity of the catalyst. Therefore, CG can be resourcefully utilized to prepare composite materials with specific functions, which not only solves environmental problems, but also realizes the resource utilization of the environment. SUMMARY

[0005] The present application aims to provide a silane coupling agent modified coal gangue chelated metal composite catalytic material and its preparation method and application, and solve the problem of coal gangue resource utilization.

[0006] The present application is realized by the following technical solutions: The present application discloses a silane coupling agent modified coal gangue chelated metal composite catalytic material, which comprises a coupling agent modified coal gangue as a carrier, and metal species loaded on the surface and pore structure of the carrier.

[0007] Further, the coupling agent is one of γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane. The metal is Co, Fe, or Mn.

[0008] The present application also discloses a preparation method of a silane coupling agent modified coal gangue chelated metal composite catalytic material, comprising the following steps: (1) mixing coal gangue with deionized water to obtain a coal gangue dispersion liquid after ultrasonic treatment; The coupling agent, deionized water, and ethanol solution are mixed to form a hydrolysis solution, which is heated in an oil bath to obtain a coupling agent hydrolysis solution; (2) mixing the coal gangue dispersion liquid with the coupling agent hydrolysis solution to obtain a mixed solution; The obtained mixed solution is heated in an oil bath for condensation reflux, and is washed to neutral by suction filtration and drying and grinding to obtain a coal gangue composite material powder with chelating capacity; (3) mixing the coal gangue composite material powder with a metal salt solution, impregnating and stirring, drying, washing to neutral, and drying and grinding to obtain a silane coupling agent modified coal gangue chelated metal composite catalytic material.

[0009] Further, in step (1), the solid-liquid ratio of coal gangue to deionized water in the coal gangue dispersion liquid is 10g:(50-100)mL.

[0010] Further, in step (1), the ratio of the coupling agent, deionized water, and ethanol solution in the coupling agent hydrolysis solution is (2.5-5)mL:(22.5-25)mL:25mL.

[0011] Further, in step (2), the oil bath heating temperature is 90-100℃.

[0012] Further, in step (2), the drying is heat treatment at 100-120℃ for 8-12 hours.

[0013] Further, in step (3), the metal salt is cobalt nitrate, ferric chloride, or manganese nitrate.

[0014] Further, in step (3), the mass ratio of the coal gangue composite material powder to the metal salt is (1-5):10.

[0015] The application further discloses application of the silane coupling agent modified coal gangue chelated metal composite catalytic material as a catalyst in degrading organic pollutants in polluted water bodies by activating persulfate, and the silane coupling agent modified coal gangue chelated metal composite catalytic material is mixed with the polluted water bodies containing organic pollutants to perform pre-adsorption. After the pre-adsorption is completed, the persulfate is added into the polluted water bodies to perform catalytic degradation of the organic pollutants.

[0016] Compared with the prior art, the application has the following beneficial technical effects: The application discloses a silane coupling agent modified coal gangue loaded metal catalytic material. The coupling agent modified coal gangue is used as a carrier, and metal species are loaded on the surface and pore structure of the carrier. The oxygen-containing functional groups in the coal gangue exist on the surface of the catalytic material, which is beneficial to the adsorption of pollutants and persulfate on the surface interface and further reaction, and the silane coupling agent modification can enhance the active sites on the surface of the coal gangue, improve the dispersity of the metal, and thus improve the activity of the catalyst. The silane coupling agent modified coal gangue material forms a stable chelate with the metal, prevents the agglomeration of metal ions, ensures the uniform distribution of the active sites, and further improves the catalytic performance.

[0017] The composite material realizes stable loading of the metal active sites through the chelation of the surface amino groups, can effectively activate peroxide to generate free radicals, and significantly improves the degradation efficiency of organic pollutants in water bodies under the adsorption-catalysis synergistic effect, and provides a new functional material for the resource utilization of coal gangue and the treatment of refractory wastewater.

[0018] The application further discloses a preparation method of the silane coupling agent modified coal gangue chelated metal composite catalytic material. A silane coupling agent hydrolysis liquid is subjected to surface grafting reaction with a coal gangue dispersion liquid to obtain a silane coupling agent functionalized coal gangue carrier material after drying and grinding. The silane coupling agent functionalized coal gangue carrier is subjected to metal loading through chelation with a transition metal salt solution, and after solid-liquid separation and washing with deionized water until neutral, the silane coupling agent functionalized coal gangue carrier is subjected to heat treatment at 100-120 DEG C for 8-12 hours to finally obtain a coal gangue based metal chelated composite catalytic material.

[0019] The application can realize the resource utilization of industrial waste, and the preparation process is simple, and raw materials are cheap and easy to obtain.

[0020] The application also discloses the application of the silane coupling agent modified coal gangue chelated metal composite catalytic material in activating PMS to remove organic pollutants in water, and high-efficiency removal of the organic pollutants can be realized.

[0021] The general formula of the silane coupling agent is Y-R-Si(OR')3. 2+ / Co 2+ The siloxane group (Si(OR')3) can be hydrolyzed to generate silicon hydroxyl (-Si-OH), and then the silicon hydroxyl reacts with the hydroxyl (-OH) on the surface of the coal gangue to form a stable Si-O-Si covalent bond, so that the coupling agent is firmly grafted on the surface of the coal gangue. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an XRD structure phase diagram of the catalytic material of Example 2. Figure 2 It is a scanning electron microscope diagram of the catalytic material of Example 2. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and specific examples. It should be noted that the specific examples described herein are only used to explain the present application, and are not a limitation of the present application. That is, these examples are only a part of the embodiments of the present application, and are not all the embodiments. Based on the core idea of the present application, any simple modification, equivalent replacement or improvement made by those skilled in the art without departing from the essential scope of the present application should be included in the protection scope of the present application.

[0024] The components described in the drawings and examples of the present application can be arranged and designed in various configurations, therefore, the following detailed description of the drawings and examples is only one specific embodiment of the present application, and is not a limitation of the protection scope. Based on the drawings and examples of the present application, other examples obtained by those skilled in the art without creative labor are within the protection scope of the present application. It should be noted that the terms “comprise”, “include” or any variant thereof mean non-exclusive inclusion, that is, the processes, elements, methods, articles or equipment comprising the listed elements are not limited to these elements, but can also include other elements not explicitly listed or inherent elements thereof.

[0025] The technical solutions in the present application will be clearly and completely described below in combination with the embodiments in the present application, but they should not be understood as limitations to the protection scope of the present application.

[0026] The application discloses a preparation method of a silane coupling agent modified coal gangue chelating metal composite catalytic material. (1) Coal gangue is mixed with deionized water, and a coal gangue dispersion liquid is obtained after ultrasonic treatment; A hydrolysis solution is prepared by mixing the coupling agent, deionized water and ethanol solution, and is heated in an oil bath to obtain a coupling agent hydrolysis solution; (2) The coal gangue dispersion liquid is mixed with the coupling agent hydrolysis solution to obtain a mixed solution; The obtained mixed solution is heated in an oil bath for condensation reflux, and is washed to neutral by suction filtration and then dried and ground to obtain a coal gangue composite material powder with chelating capacity; (3) The coal gangue composite material powder is mixed with a metal salt solution, and is immersed and stirred, dried, washed to neutral and then dried and ground to obtain an M@CH-CG powder.

[0027] Example 1 The present example provides a preparation method of a Co@KH792-CG catalytic material, including the following steps: (1) 5g of coal gangue is mixed with 100mL of deionized water, and ultrasonic treatment is performed for 1h to obtain a coal gangue dispersion liquid; (2) 2.5mL of MH solution, 22.5mL of deionized water and 25mL of ethanol solution are mixed to prepare a hydrolysis solution, which is placed in a three-necked flask and heated in an oil bath for 4-6h to obtain a KH792 hydrolysis solution; (3) The coal gangue dispersion liquid is added to the KH792 hydrolysis solution to obtain a mixed solution; The obtained mixed solution is heated in an oil bath for condensation reflux, and is washed to neutral by suction filtration and then dried and ground to obtain a KH792-CG powder.

[0028] (4) 2.5g of KH792-CG powder and 1g of cobalt nitrate are prepared into a mixed solution with a volume of 50mL; the mixed solution is placed in a magnetic stirring chamber and stirred at room temperature for 8h, and is washed to neutral by suction filtration, dried in an oven at 120℃ for 8h, and then ground to obtain a modified coal gangue catalytic material loaded with cobalt, which is denoted as Co@KH792-CG.

[0029] Example 2 The present example provides a preparation method of a Co@KH550-CG catalytic material, including the following steps: (1) 5g of coal gangue is mixed with 100mL of deionized water, and ultrasonic treatment is performed for 1h to obtain a coal gangue dispersion liquid; (2) 2.5 mL of KH550 solution, 22.5 mL of deionized water and 25 mL of ethanol solution were mixed to form a hydrolysis solution, which was placed in a three-necked flask and heated in an oil bath for 4-6 h to obtain a KH550 hydrolysis solution; (3) The coal gangue dispersion liquid was added to the KH550 hydrolysis solution to obtain a mixed solution, and the obtained mixed solution was heated in an oil bath and condensed to reflux. The obtained mixed solution was filtered and washed to neutral, dried and ground to obtain a KH550-CG powder.

[0030] (4) 2.5 g of KH550-CG powder and 1 g of cobalt nitrate were mixed to form a 50 mL mixed solution. The mixed solution was placed in a magnetic stirring chamber and stirred at room temperature for 8 h. After filtration and washing to neutral, drying was performed in an oven at 120°C for 8 h. After grinding, a cobalt-loaded modified coal gangue catalytic material was obtained, which was recorded as Co@KH550-CG.

[0031] Example 3: The present example provides a preparation method of a Co@KH602-CG catalytic material, comprising the following steps: (1) 5 g of coal gangue was mixed with 100 mL of deionized water, and ultrasonic treatment was performed for 1 h to obtain a coal gangue dispersion liquid; (2) 2.5 mL of KH602 solution, 22.5 mL of deionized water and 25 mL of ethanol solution were mixed to form a hydrolysis solution, which was placed in a three-necked flask and heated in an oil bath for 4-6 h to obtain a KH602 hydrolysis solution; (3) The coal gangue dispersion liquid was added to the KH602 hydrolysis solution to obtain a mixed solution, and the obtained mixed solution was heated in an oil bath and condensed to reflux. The obtained mixed solution was filtered and washed to neutral, dried and ground to obtain a KH602-CG powder.

[0032] (4) 2.5 g of KH602-CG powder and 1 g of cobalt nitrate were mixed to form a 50 mL mixed solution. The mixed solution was placed in a magnetic stirring chamber and stirred at room temperature for 8 h. After filtration and washing to neutral, drying was performed in an oven at 120°C for 8 h. After grinding, a cobalt-loaded modified coal gangue catalytic material was obtained, which was recorded as Co@KH550-CG.

[0033] Example 4: The present example provides a preparation method of a Fe@KH550-CG catalytic material, comprising the following steps: (1) 5 g of coal gangue was mixed with 100 mL of deionized water, and ultrasonic treatment was performed for 1 h to obtain a coal gangue dispersion liquid; (2) 2.5 mL of KH550 solution, 22.5 mL of deionized water and 25 mL of ethanol solution were mixed to form a hydrolysis solution, which was placed in a three-necked flask and heated in an oil bath for 4-6 h to obtain a KH550 hydrolysis solution; (3) The coal gangue dispersion liquid is added to the KH550 hydrolysis liquid to obtain a mixed solution, the obtained mixed solution is heated by oil bath and condensed to reflux, the obtained mixed solution is filtered and washed to neutral, and dried and ground to obtain a KH550-CG powder.

[0034] (4) 2.5 g of the KH550-CG powder and 1 g of iron chloride are prepared into a mixed solution of 50 mL; the mixed solution is placed in a magnetic stirring chamber and stirred at room temperature for 8 h, filtered and washed to neutral, dried at 100°C in an oven for 12 h, and ground to obtain a modified coal gangue catalytic material loaded with iron, denoted as Fe@KH550-CG.

[0035] Example 5 The present example provides a preparation method of a Mn@KH550-CG catalytic material, comprising the following steps: (1) 5 g of coal gangue is mixed with 100 mL of deionized water, and ultrasonic treatment is performed for 1 h to obtain a coal gangue dispersion liquid; (2) 2.5 mL of a KH550 solution, 22.5 mL of deionized water, and 25 mL of an ethanol solution are prepared into a hydrolysis liquid, which is placed in a three-necked flask and heated by oil bath for 4-6 h to obtain a KH550 hydrolysis liquid; (3) The coal gangue dispersion liquid is added to the KH550 hydrolysis liquid to obtain a mixed solution, the obtained mixed solution is heated by oil bath and condensed to reflux, the obtained mixed solution is filtered and washed to neutral, and dried and ground to obtain a KH550-CG powder.

[0036] (4) 2.5 g of the KH550-CG powder and 1 g of manganese nitrate are prepared into a mixed solution of 50 mL; the mixed solution is placed in a magnetic stirring chamber and stirred at room temperature for 8 h, filtered and washed to neutral, dried at 110°C in an oven for 10 h, and ground to obtain a modified coal gangue catalytic material loaded with manganese, denoted as Mn@KH550-CG.

[0037] Comparative Example 1 The present comparative example provides a preparation method of a pure coal gangue (CG) catalytic material, comprising the following steps: (1) 5 g of coal gangue is mixed with 100 mL of deionized water, and ultrasonic treatment is performed for 1 h to obtain a coal gangue dispersion liquid; (2) The coal gangue dispersion liquid is filtered and washed to neutral, dried at 120°C in an oven, and ground to obtain a pure coal gangue catalytic material, denoted as CG.

[0038] Comparative Example 2 The present comparative example provides a preparation method of a KH550 modified coal gangue (KH550-CG) catalytic material, comprising the following steps: (1) 5 g of coal gangue is mixed with 100 mL of deionized water, and ultrasonic treatment is performed for 1 h to obtain a coal gangue dispersion liquid; (2) 2.5 mL KH550 solution, 22.5 mL deionized water and 25 mL ethanol solution were prepared into a hydrolysis solution, which was placed in a three-necked flask and heated in an oil bath for 4-6 h to obtain a KH550 hydrolysis solution; (3) The coal gangue dispersion solution was added to the KH550 hydrolysis solution to obtain a mixed solution, the obtained mixed solution was heated and condensed in an oil bath, and the obtained mixed solution was filtered and washed to neutral, dried and ground to obtain a KH550-CG powder, which was recorded as KH550-CG.

[0039] Application Example 1 A NOR aqueous solution with a concentration of 20 mg / L was prepared with deionized water, 100 mL of which was taken in a conical flask, and 60 mg of the catalytic material prepared in Examples 1-5 and Comparative Examples 1-2 was added. The adsorption performance of the material on pollutants was studied. The whole reaction was carried out in a constant temperature shaking incubator at room temperature at a speed of 180 rpm / min. During the reaction, 5.0 mL of reaction solution sample was taken out at a predetermined time interval, and was injected into a centrifuge tube containing 5.0 mL of methanol using a 0.22 μm water-based microporous filter for determination of the concentration of NOR. The experimental process was carried out in a light-proof environment.

[0040] Application Example 2 A NOR aqueous solution with a concentration of 20 mg / L was prepared with deionized water, 100 mL of which was taken in a conical flask, and 60 mg of the catalytic material prepared in Examples 1-5 and Comparative Examples 1-2 was added. After 30 min of adsorption equilibrium, 2 mM of PMS was added to the conical flask to initiate the degradation stage. The whole reaction was carried out in a constant temperature shaking incubator at room temperature at a speed of 180 rpm / min. During the reaction, 5.0 mL of reaction solution sample was taken out at a predetermined time interval, and was injected into a centrifuge tube containing 5.0 mL of methanol using a 0.22 μm water-based microporous filter for determination of the concentration of NOR. The experimental process was carried out in a light-proof environment.

[0041] The performance data of Application Example 1 are shown in Table 1, and the data of Application Example 2 are shown in Table 2.

[0042] Table 1 Adsorption of catalyst material on NOR

[0043] Table 2 Degradation of catalyst material on NOR

[0044] Table 1 is the adsorption performance of M@CH-CG catalytic materials prepared in Examples 1-5 of the present application, CG catalytic materials of Comparative Example 1 and KH550-CG catalytic materials of Comparative Example 2, and the results are shown in Table 1. Compared with the catalytic materials of Actual Examples 1-5, the adsorption performance of CG prepared in Comparative Example 1 is better for NOR, which may be because the loading of KH550 on the surface of coal gangue may block part of the pores, resulting in a decrease in specific surface area and pore volume, thereby reducing the adsorption performance. All catalyst materials basically reach adsorption equilibrium state within 30 min.

[0045] Table 2 shows the degradation performance test results of M@CH-CG catalytic materials prepared in Examples 1-5 of the present application, CG catalytic materials of Comparative Example 1 and KH550-CG catalytic materials of Comparative Example 2, and the corresponding degradation results are shown in Table 2. The experimental results show that in the series of Examples 1-3 materials, the Co@MH-CG materials modified by different coupling agents have a removal rate of NOR of more than 85% within 60 min, which shows that coal gangue is an excellent carrier and can be flexibly modified by different silane coupling agents to adapt to metal-based PMS activation catalysts.

[0046] Among them, the Co@KH550-CG catalyst prepared in Example 2 shows the best degradation performance for NOR. By comparing the different M@KH550-CG materials of Examples 2, 4 and 5, it can be found that the KH550-CG carrier chelated with different metal ions (such as Fe, Mn, etc.) can all maintain excellent NOR degradation ability, which shows that the KH550 modified coal gangue shows good adaptability to different metals, indicating that the carrier design has universality and may be applicable to the construction of other metal catalysts (such as Ni, Cu).

[0047] It is worth noting that the Co@KH550-CG of Example 2 shows the best NOR removal efficiency after pre-adsorption for 30 minutes, which is due to the enrichment of NOR molecules on the surface of the material through electrostatic action, effectively promoting the activation of persulfate (PMS) and generating more active species, thereby significantly improving the degradation efficiency.

[0048] Characterization of catalytic materials By means of X-ray diffraction (XRD) technology, the crystal structure characteristics of the Co@KH550-CG catalytic material prepared in Example 2 of the best performance catalytic material of the present application, the CG catalytic material of Comparative Example 1 and the KH550-CG catalytic material of Comparative Example 2 were characterized. The results are shown in Figure 1 as shown in Figure 1It can be seen that: all samples showed obvious SiO2 crystal diffraction peaks, indicating that the support material CG has a clear silica crystal phase structure; the KH550-CG sample (Comparative Example 2) did not show obvious characteristic diffraction peaks, because the supported silane coupling agent KH550 itself is an organic molecule with poor crystallinity, and therefore usually does not produce significant crystal diffraction peaks in the XRD pattern; the Co@KH550-CG sample (Example 2) did not show characteristic diffraction peaks of metallic cobalt (Co). This may be because the cobalt species are highly dispersed on the catalyst surface, with a particle size smaller than the detection limit of XRD, or cobalt exists in an amorphous form.

[0049] The surface morphology and microstructure of Example 2, the catalytic material with the best performance of the present invention, were characterized using scanning electron microscopy (SEM). Figure 2 As shown in (a) and (a'), the original coal gangue (CG) exhibits an irregular lamellar structure with varying sizes, and some areas show relatively dense accumulation. KH550-CG (after modification with KH550) is then obtained. Figure 2 (b) and (b')) exhibit a more uniform and dense surface morphology. This may be due to the introduction of more active groups (such as Si-OH and -NH2) into the CG surface by KH550, which enhances the interfacial bonding with other materials, thus presenting a denser structure in the SEM images. Further introduction of metallic Co results in Co@KH550-CG ( Figure 2 The surfaces of (c) and (c') become rougher and the packing is more compact. Energy dispersive X-ray spectroscopy (EDS) analysis results of this catalyst ( Figure 2 (d) confirmed that C, O, Al, Si and Co elements are uniformly distributed on the catalyst surface, further proving that metallic Co has been successfully loaded onto the surface of KH550 modified coal gangue (KH550-CG).

[0050] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A silane coupling agent-modified coal gangue chelated metal composite catalytic material, characterized in that, The coal gangue is modified by a coupling agent as a carrier, and metal species are loaded on the surface and pore structure of the carrier.

2. The silane coupling agent modified coal gangue chelated metal composite catalytic material according to claim 1, characterized in that, The coupling agent is one of γ-aminopropyl triethoxysilane, N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxysilane and N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane. The metal is Co, Fe or Mn.

3. A method for preparing a silane coupling agent-modified coal gangue chelated metal composite catalytic material, characterized in that, The method comprises the following steps: (1) mixing the coal gangue with deionized water to obtain a coal gangue dispersion liquid after ultrasonic treatment; The coupling agent, deionized water and an ethanol solution are mixed to obtain a hydrolysis solution, and the hydrolysis solution is heated in an oil bath to obtain a coupling agent hydrolysis solution; (2) mixing the coal gangue dispersion liquid with the coupling agent hydrolysis solution to obtain a mixed solution; The mixed solution is heated in an oil bath for condensation and reflux, and then filtered, washed to neutral and dried and ground to obtain a coal gangue composite material powder with chelating ability; (3) mixing the coal gangue composite material powder with a metal salt solution, impregnating and stirring, drying, washing to neutral, drying and grinding to obtain a silane coupling agent modified coal gangue chelated metal composite catalytic material.

4. The production method according to claim 3, characterized by, In step (1), the solid-liquid ratio of the coal gangue to the deionized water in the coal gangue dispersion liquid is 10 g to (50-100) mL.

5. The preparation method according to claim 3, characterized in that, In step (1), the ratio of the coupling agent, deionized water and ethanol solution in the coupling agent hydrolysis solution is (2.5-5) mL to (22.5-25) mL to 25 mL.

6. The preparation method according to claim 3, characterized in that, In step (2), the oil bath heating temperature is 90-100°C.

7. The preparation method according to claim 3, characterized in that, In step (2), the drying is heat treatment at 100-120°C for 8-12 hours.

8. The preparation method according to claim 3, characterized in that, In step (3), the metal salt is cobalt nitrate, ferric chloride or manganese nitrate.

9. The preparation method according to claim 3, characterized in that, In step (3), the mass ratio of the coal gangue composite material powder to the metal salt is (1-5) to 10.

10. The use of silane coupling agent-modified coal gangue chelated metal composite catalytic material according to claim 1 or 2 as a catalyst for the degradation of organic pollutants in contaminated water bodies by activated persulfate, characterized in that, The silane coupling agent modified coal gangue chelated metal composite catalytic material is mixed with a polluted water body containing organic pollutants for pre-adsorption. After the pre-adsorption is completed, persulfate is added to the polluted water body for catalytic degradation of the organic pollutants.

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