Preparation method and application of bivalent iron-loaded amphiphilic cellulose

Abstract

The application relates to the field of high-value utilization of lignocellulosic biomass, in particular to a preparation method and application of a divalent iron-loaded amphiphilic cellulose, and a divalent iron-loaded amphiphilic cellulose material is obtained, and the problems of uneven release of divalent iron and low reaction efficiency in traditional technologies are solved. The material can release ferrous ions at the oil-water interface in a directional manner, high-concentration sulfate radicals are generated through the reaction of the ferrous ions and persulfate, so that the oxidation capacity is significantly improved, and demulsification is effectively realized.

Description

Technical Field

[0001] This application relates to the field of high-value utilization of lignocellulose biomass, specifically a method for preparing and applying amphiphilic cellulose loaded with ferrous iron. Background Technology

[0002] Oil-water separation has wide applications in oil extraction, marine oil spill treatment, and industrial wastewater treatment; however, existing oil-water separation technologies still face many challenges. Traditional methods, such as chemical demulsification, membrane separation, and adsorption, while capable of solving oil-water separation problems, typically suffer from drawbacks such as long reaction times, poor treatment efficiency, high costs, complex operation, and environmental pollution. Therefore, there is an urgent need for a highly efficient, green, environmentally friendly, and highly stable oil-water separation material.

[0003] Currently, oil-water separation materials are generally classified into hydrophilic, lipophilic, and amphiphilic materials. Hydrophilic materials can typically only handle emulsions in the aqueous phase, while lipophilic materials mainly act on emulsions in the oil phase. The emergence of amphiphilic materials has greatly improved the separation efficiency at the oil-water interface. However, existing amphiphilic materials often suffer from low efficiency and short-lasting demulsification effects, especially when dealing with complex oil-water emulsion systems, where their processing effectiveness is limited.

[0004] To address these issues, researchers attempted to use divalent iron (Fe²⁺). 2+ ) as a catalyst to promote the ionization of persulfate (S2O8) 2- The decomposition of ferrous ions generates sulfate radicals (SO4•), which are highly oxidizing. These sulfate radicals can rapidly disrupt the emulsion structure at the oil-water interface, thereby improving oil-water separation efficiency. However, in existing technologies, the release of ferrous ions is often difficult to control, leading to uneven distribution of ferrous ions in the oil-water system and reducing the generation efficiency and reaction rate of sulfate radicals. Therefore, improving the directional release of ferrous ions and enhancing their reaction efficiency with persulfate ions is key to improving oil-water separation performance.

[0005] Therefore, it is necessary to design an amphiphilic cellulose material loaded with ferrous iron to solve the problems of uneven ferrous iron release and low reaction efficiency in traditional technologies. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems in the prior art, this application provides a method for preparing amphiphilic cellulose loaded with divalent iron and its application.

[0007] A method for preparing amphiphilic cellulose loaded with ferrous iron specifically includes the following steps: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose; the introduction of amino groups significantly improved the hydrophilicity of cellulose, facilitating subsequent reaction with ferrous ions (Fe2+).2+ The binding of ) provides sufficient reaction sites; (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 part of aminocellulose in 20 parts of ethanol; under nitrogen protection, stir thoroughly with a magnetic stirrer to ensure complete dispersion of cellulose; ② Hydrolysis of methyltrimethoxysilane: Take methyltrimethoxysilane, add methanol, and stir thoroughly to hydrolyze it to generate silanol; continue stirring the reaction solution for 30–60 minutes until the reaction is complete; ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring; if bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous; ④ Post-treatment: After the reaction is complete, add the system to 200 mL of ice water to precipitate a white precipitate; filter and collect the product, and wash it 3 times with ethanol; finally wash it with distilled water until neutral; vacuum dry the product to obtain N-silanized aminocellulose; (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to produce divalent iron (Fe2+). 2+ The loading of ferrous iron is achieved by uniformly loading ferrous iron onto the cellulose surface and bonding it firmly to the material surface through chemical bonding. A stable loading of ferrous iron can be obtained by controlling the reaction conditions.

[0008] Further, in step (1), the reaction conditions are as follows: 1.00 parts of microcrystalline cellulose and 10.00 parts of HBP-NH2 are added to 6.0 parts of NaOH aqueous solution, and 14.00 parts of epichlorohydrin are added under strong stirring at 0°C (ice bath) to form solid particles through crosslinking with epichlorohydrin and PEI cellulose; the product is collected by filtration and washed 3 times with ethanol; finally, it is washed with distilled water until neutral; and the product is vacuum dried.

[0009] Furthermore, the NaOH aqueous solution in step (1) is 12 wt%.

[0010] Furthermore, in step (1), the vacuum drying is carried out at a temperature of 50°C for 12 hours.

[0011] Furthermore, in step (2), the ratio of methyltrimethoxysilane to methanol is 1.2 mmol of methyltrimethoxysilane to 5 mL of methanol.

[0012] Further, in step (2), wherein ③ reaction: the hydrolyzed APTES solution is slowly added to the cellulose solution while stirring; the reaction temperature is maintained at room temperature to 50°C, and the reaction is continued for 6–12 hours with stirring.

[0013] Furthermore, in step (2), in post-processing ④, the product is vacuum dried at a temperature of 50°C for 12 hours.

[0014] Furthermore, in step (3), the reaction conditions are as follows: the mass ratio of ferrous sulfate heptahydrate to cellulose is 1:3, the reaction temperature is 30-40℃, and the reaction time is 4 hours.

[0015] An amphiphilic cellulose loaded with divalent iron was prepared by the method described above.

[0016] The aforementioned amphiphilic cellulose loaded with ferrous iron has applications in oil-water separation. This material can directionally release ferrous ions at the oil-water interface, and through the reaction of ferrous ions with persulfate ions, generate a high concentration of sulfate free radicals, thereby significantly improving oxidation capacity and effectively demulsifying.

[0017] Compared with the prior art, the technical effects created by this application are reflected in: (1) Amphiphilic material design: Compared with existing single oleophilic or hydrophilic materials, the amphiphilic cellulose material of the present invention can give full play to the amphiphilic properties at the oil-water interface, and significantly improve the efficiency of oil-water separation.

[0018] (2) Directed release of ferrous ions: By precisely controlling the hydrophilicity and hydrophobicity of cellulose materials, ferrous ions can be released in a targeted manner to enhance the oxidation capacity, thereby increasing the concentration of sulfate free radicals and further accelerating the demulsification process at the oil-water interface.

[0019] (3) Efficient generation of sulfate radicals: The material loaded with divalent iron generates sulfate radicals by reacting with persulfate. These radicals have strong oxidizing properties, can efficiently demulsify, and the reaction process is stable and continuous.

[0020] (4) Sustainable and environmentally friendly: The materials used in this invention (such as cellulose, polyethyleneimine, etc.) are widely available and environmentally friendly. They can not only effectively solve the problem of oil-water separation, but also reduce the use of chemical agents, which is in line with the concept of green chemistry.

[0021] (5) Easy to operate and highly adaptable: The preparation process of this material is simple and easy to carry out, suitable for various industrial environments, capable of large-scale production, and can be widely used in marine oil pollution treatment, oil extraction, industrial wastewater treatment and other fields. Attached Figure Description

[0022] Figure 1 This is a reaction flow diagram of the present invention.

[0023] Figure 2 This is an EDS scan of the amphiphilic cellulose loaded with divalent iron prepared in Example 1.

[0024] Figure 3This is an XPS image of the amphiphilic cellulose loaded with divalent iron prepared in Example 1.

[0025] Figure 4 This is an infrared schematic diagram of the amphiphilic cellulose loaded with divalent iron prepared in Example 1.

[0026] Figure 5 The concentration of ferrous ions released over time by the amphiphilic cellulose loaded with divalent iron prepared in Example 1 under different pH conditions.

[0027] Figure 6 This is a schematic diagram of the EPR of amphiphilic cellulose loaded with divalent iron prepared in Example 1.

[0028] Figure 7 This is a photograph showing the phenomenon of amphiphilic cellulose loaded with divalent iron, prepared in Example 1, acting on oil and water. Detailed Implementation

[0029] The technical solution of this application will be further defined below with reference to specific implementation methods, but the scope of protection is not limited to the description.

[0030] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; and the biological and chemical reagents used are conventional reagents in the art unless otherwise specified.

[0031] Example 1 This invention relates to a method for preparing amphiphilic cellulose loaded with ferrous iron, the specific implementation process of which is as follows: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose. The introduction of amino groups significantly improved the hydrophilicity of cellulose, facilitating subsequent reaction with ferrous ions (Fe2+). 2+ The combination of cellulose and PEI provides sufficient reaction sites. The reaction conditions were as follows: 1.00 g microcrystalline cellulose and 10.00 g HBP-NH2 were added to 6.0 mL of NaOH aqueous solution (12 wt%), and 14.00 g epichlorohydrin was added under vigorous stirring at 0°C (ice bath). Solid particles were formed by crosslinking with epichlorohydrin and PEI cellulose. The product was collected by filtration and washed three times with ethanol. Finally, it was washed with distilled water until neutral. The product was vacuum dried at 50°C for 12 hours. (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 g of aminocellulose in 20 mL of ethanol. Under nitrogen protection, stir thoroughly with a magnetic stirrer to ensure complete dispersion of cellulose. ② Hydrolysis of methyltrimethoxysilane: Take an appropriate amount of methyltrimethoxysilane (1.2 mmol), add 5 mL of methanol, and stir thoroughly to hydrolyze it to form silanol. Continue stirring the reaction solution for about 30–60 minutes until the reaction is complete. ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring. Maintain the reaction temperature at room temperature to 50 °C and continue stirring for 6–12 hours. If bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous. ④ Post-treatment: After the reaction is complete, add the system to 200 mL of ice water, and a white precipitate will precipitate. Filter and collect the product, and wash it three times with ethanol. Finally, wash with distilled water until neutral. Vacuum dry the product at 50 °C for 12 hours to obtain N-silanized aminocellulose.

[0032] (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to produce divalent iron (Fe2+). 2+ The loading of ferrous sulfate heptahydrate onto cellulose is achieved under the following conditions: a mass ratio of ferrous sulfate heptahydrate to cellulose of 1:3, a reaction temperature of 30-40℃, and a reaction time of 4 hours. This step uniformly loads ferrous iron onto the cellulose surface, where it is firmly bonded to the material surface through chemical bonding. By controlling the reaction conditions, a stable loading of ferrous iron can be obtained.

[0033] Example 2 This invention relates to a method for preparing amphiphilic cellulose loaded with ferrous iron, the specific implementation process of which is as follows: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose. The introduction of amino groups significantly improved the hydrophilicity of cellulose, facilitating subsequent reaction with ferrous ions (Fe2+). 2+ The combination of cellulose and PEI provides sufficient reaction sites. The reaction conditions were as follows: 1.00 g microcrystalline cellulose and 10.00 g HBP-NH2 were added to 6.0 mL of NaOH aqueous solution (10 wt%), and 14.00 g epichlorohydrin was added under vigorous stirring at 0°C (ice bath). Solid particles were formed by crosslinking with epichlorohydrin and PEI cellulose. The product was collected by filtration and washed three times with ethanol. Finally, it was washed with distilled water until neutral. The product was vacuum dried at 50°C for 12 hours. (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 g of aminocellulose in 20 mL of ethanol. Under nitrogen protection, stir thoroughly with a magnetic stirrer to ensure complete dispersion of cellulose. ② Hydrolysis of methyltrimethoxysilane: Take an appropriate amount of methyltrimethoxysilane (1.2 mmol), add 5 mL of methanol, and stir thoroughly to hydrolyze it to form silanol. Continue stirring the reaction solution for about 30–60 minutes until the reaction is complete. ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring. Maintain the reaction temperature at room temperature to 50 °C and continue stirring for 6–12 hours. If bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous. ④ Post-treatment: After the reaction is complete, add the system to 200 mL of ice water, and a white precipitate will precipitate. Filter and collect the product, and wash it three times with ethanol. Finally, wash with distilled water until neutral. Vacuum dry the product at 50 °C for 12 hours to obtain N-silanized aminocellulose.

[0034] (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to produce divalent iron (Fe2+). 2+ The loading of ferrous sulfate heptahydrate onto cellulose is achieved under the following conditions: a mass ratio of ferrous sulfate heptahydrate to cellulose of 1:3, a reaction temperature of 30-40℃, and a reaction time of 4 hours. This step uniformly loads ferrous iron onto the cellulose surface, where it is firmly bonded to the material surface through chemical bonding. By controlling the reaction conditions, a stable loading of ferrous iron can be obtained.

[0035] Example 3 This invention relates to a method for preparing amphiphilic cellulose loaded with ferrous iron, the specific implementation process of which is as follows: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose. The introduction of amino groups significantly improved the hydrophilicity of cellulose, facilitating subsequent reaction with ferrous ions (Fe2+). 2+ The combination of cellulose and PEI provides sufficient reaction sites. The reaction conditions were as follows: 1.00 g microcrystalline cellulose and 10.00 g HBP-NH2 were added to 6.0 mL of NaOH aqueous solution (10 wt%), and 14.00 g epichlorohydrin was added under vigorous stirring at 0°C (ice bath). Solid particles were formed by crosslinking with epichlorohydrin and PEI cellulose. The product was collected by filtration and washed three times with ethanol. Finally, it was washed with distilled water until neutral. The product was vacuum dried at 50°C for 12 hours. (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 g of aminocellulose in 20 mL of ethanol. Under nitrogen protection, stir thoroughly with a magnetic stirrer to ensure complete dispersion of cellulose. ② Hydrolysis of methyltrimethoxysilane: Take an appropriate amount of methyltrimethoxysilane (1.2 mmol), add 5 mL of methanol, and stir thoroughly to hydrolyze it to form silanol. Continue stirring the reaction solution for about 30–60 minutes until the reaction is complete. ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring. Maintain the reaction temperature at room temperature to 50 °C and continue stirring for 6–12 hours. If bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous. ④ Post-treatment: After the reaction is complete, add the system to 200 mL of ice water, and a white precipitate will precipitate. Filter and collect the product, and wash it three times with ethanol. Finally, wash with distilled water until neutral. Vacuum dry the product at 50 °C for 12 hours to obtain N-silanized aminocellulose.

[0036] (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to produce divalent iron (Fe2+). 2+ The loading of ferrous sulfate heptahydrate onto cellulose is achieved under the following conditions: a mass ratio of ferrous sulfate heptahydrate to cellulose of 1:3, a reaction temperature of 50-60℃, and a reaction time of 4 hours. This step uniformly loads ferrous iron onto the cellulose surface, where it is firmly bonded to the material surface through chemical bonding. By controlling the reaction conditions, a stable loading of ferrous iron can be obtained.

[0037] Comparative Example 1 This invention relates to a method for preparing amphiphilic cellulose loaded with ferrous iron, the specific implementation process of which is as follows: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose. The introduction of amino groups significantly improved the hydrophilicity of cellulose, facilitating subsequent reaction with ferrous ions (Fe2+). 2+ The combination of cellulose and PEI provides sufficient reaction sites. The reaction conditions were as follows: 1.00 g microcrystalline cellulose and 10.00 g HBP-NH2 were added to 10.0 mL of NaOH aqueous solution (12 wt%), and 14.00 g epichlorohydrin was added under vigorous stirring at 0°C (ice bath). Solid particles were formed by crosslinking epichlorohydrin with cellulose PEI. The product was collected by filtration and washed three times with ethanol. Finally, it was washed with distilled water until neutral. The product was vacuum dried at 50°C for 12 hours. (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 g of aminocellulose in 20 mL of ethanol. Under nitrogen protection, stir thoroughly with a magnetic stirrer to ensure complete dispersion of cellulose. ② Hydrolysis of methyltrimethoxysilane: Take an appropriate amount of methyltrimethoxysilane (1.2 mmol), add 5 mL of methanol, and stir thoroughly to hydrolyze it to form silanol. Continue stirring the reaction solution for about 30–60 minutes until the reaction is complete. ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring. Maintain the reaction temperature at room temperature to 50 °C and continue stirring for 6–12 hours. If bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous. ④ Post-treatment: After the reaction is complete, add the system to 200 mL of ice water, and a white precipitate will precipitate. Filter and collect the product, and wash it three times with ethanol. Finally, wash with distilled water until neutral. Vacuum dry the product at 50 °C for 12 hours to obtain N-silanized aminocellulose.

[0038] (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to produce divalent iron (Fe2+). 2+ The loading of ferrous sulfate heptahydrate onto cellulose is achieved under the following conditions: a mass ratio of ferrous sulfate heptahydrate to cellulose of 1:3, a reaction temperature of 30-40℃, and a reaction time of 4 hours. This step uniformly loads ferrous iron onto the cellulose surface, where it is firmly bonded to the material surface through chemical bonding. By controlling the reaction conditions, a stable loading of ferrous iron can be obtained.

[0039] Comparative Example 2 This invention relates to a method for preparing amphiphilic cellulose loaded with ferrous iron, the specific implementation process of which is as follows: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose. The introduction of amino groups significantly improved the hydrophilicity of cellulose, facilitating subsequent reaction with ferrous ions (Fe2+). 2+ The combination of cellulose and PEI provides sufficient reaction sites. The reaction conditions were as follows: 1.00 g microcrystalline cellulose and 10.00 g HBP-NH2 were added to 10.0 mL of NaOH aqueous solution (12 wt%), and 14.00 g epichlorohydrin was added under vigorous stirring at 0°C (ice bath). Solid particles were formed by crosslinking epichlorohydrin with cellulose PEI. The product was collected by filtration and washed three times with ethanol. Finally, it was washed with distilled water until neutral. The product was vacuum dried at 50°C for 12 hours. (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 g of aminocellulose in 20 mL of ethanol. Under nitrogen protection, stir thoroughly with a magnetic stirrer to ensure complete dispersion of cellulose. ② Hydrolysis of methyltrimethoxysilane: Take an appropriate amount of methyltrimethoxysilane (1.3 mmol), add 5 mL of methanol, and stir thoroughly to hydrolyze it to form silanol. Continue stirring the reaction solution for about 30–60 minutes until the reaction is complete. ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring. Maintain the reaction temperature at room temperature to 50 °C and continue stirring for 6–12 hours. If bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous. ④ Post-treatment: After the reaction is complete, add the system to 200 mL of ice water, and a white precipitate will precipitate. Filter and collect the product, and wash it three times with ethanol. Finally, wash with distilled water until neutral. Vacuum dry the product at 50 °C for 12 hours to obtain N-silanized aminocellulose.

[0040] (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to produce divalent iron (Fe2+). 2+ The loading of ferrous sulfate heptahydrate onto cellulose is achieved under the following conditions: a mass ratio of ferrous sulfate heptahydrate to cellulose of 1:3, a reaction temperature of 30-40℃, and a reaction time of 4 hours. This step uniformly loads ferrous iron onto the cellulose surface, where it is firmly bonded to the material surface through chemical bonding. By controlling the reaction conditions, a stable loading of ferrous iron can be obtained.

[0041] Finally, it must be emphasized that the above-described embodiments are merely highly representative examples in this application. Undoubtedly, the technical concepts covered in this application extend far beyond these specific examples; their boundaries are broad and can accommodate numerous variations and innovations. Therefore, any modifications and improvements that a person skilled in the art can directly deduce or reasonably conceive of based on the information disclosed in this application should, without exception, be considered to fall within the protection scope of this application.

Claims

1. A method for preparing amphiphilic cellulose loaded with ferrous iron, characterized in that, Specifically, the steps include the following: (1) Amination treatment: Microcrystalline cellulose was reacted with epichlorohydrin to obtain aminocellulose; (2) Grafting of silica-oxygen groups: ① Dissolve / suspend 1.00 part of aminocellulose in 20 parts of ethanol; under nitrogen protection, stir thoroughly to ensure complete dispersion of cellulose; ② Hydrolysis of methyltrimethoxysilane: Take methyltrimethoxysilane, add methanol, stir thoroughly to hydrolyze it to generate silanol; continue stirring the reaction solution for 30–60 minutes until the reaction is complete; ③ Reaction: Slowly add the hydrolyzed APTES solution to the cellulose solution while stirring; if bubbles are generated during the reaction, it indicates that the hydrolysis reaction is relatively vigorous; ④ Post-treatment: After the reaction is complete, add the system to ice water to precipitate a white precipitate; filter and collect the product, and wash it 3 times with ethanol; finally wash it with distilled water until neutral; vacuum dry the product to obtain N-silanized aminocellulose. (3) Loading divalent iron: Aminocellulose grafted with siloxy groups was reacted with ferrous sulfate heptahydrate solution to load ferrous iron.

2. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 1, characterized in that, In step (1), the reaction conditions are as follows: 1.00 parts of microcrystalline cellulose and 10.00 parts of HBP-NH2 are added to 6.0 parts of NaOH aqueous solution, and 14.00 parts of epichlorohydrin are added under strong stirring at 0°C to form solid particles through crosslinking with epichlorohydrin PEI cellulose. The product was collected by filtration and washed with ethanol; finally, it was washed with distilled water until neutral. The product was dried under vacuum.

3. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 2, characterized in that, The NaOH aqueous solution in step (1) is 12 wt%.

4. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 2, characterized in that, The vacuum drying in step (1) is carried out at a temperature of 50°C for 12 hours.

5. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 1, characterized in that, In step (2), the ratio of methyltrimethoxysilane to methanol is 1.2 mmol of methyltrimethoxysilane to 5 mL of methanol.

6. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 1, characterized in that, In step (2), ③ reaction: the hydrolyzed APTES solution is slowly added to the cellulose solution while stirring; the reaction temperature is maintained at room temperature to 50°C, and the reaction is continued for 6–12 hours with stirring.

7. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 1, characterized in that, In step (2), in post-processing ④, the product is vacuum dried at a temperature of 50°C for 12 hours.

8. The method for preparing amphiphilic cellulose loaded with divalent iron according to claim 1, characterized in that, In step (3), the reaction conditions are: the mass ratio of ferrous sulfate heptahydrate to cellulose is 1:3, the reaction temperature is 30-40℃, and the reaction time is 4 hours.

9. An amphiphilic cellulose loaded with divalent iron, characterized in that, It is prepared by the method described in any one of claims 1-8.

10. The application of the amphiphilic cellulose loaded with divalent iron as described in claim 9 in oil-water separation.

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