Biomass fiber material, preparation method and application of biomass fiber material in degradation of antibiotics in water body

Abstract

The invention relates to the field of water treatment, and particularly discloses a biomass fiber material, a preparation method and application in degradation of antibiotics in water, and the biomass fiber material comprises the following substances in parts by weight: 0.1-0.5 part of an amphiphilic compound, 0.5-2 parts of carbon fibers, 1-3 parts of carbon nanotubes, 3-5 parts of powdery chitosan, 1-8 parts of ferric acetylacetonate and 15-30 parts of glycerol. The preparation method comprises the following steps: mixing and reacting oxidized carbon fibers and powdery chitosan to obtain biomass fiber balls; mixing and stirring the biomass fiber balls subjected to acid treatment, an amphiphilic compound and a carbon oxide nanotube in glycerol to obtain a biomass fiber compound; and reacting the biomass fiber compound with ferric acetylacetonate to obtain the biomass fiber material. The biomass fiber material has the advantages of being environmentally friendly, high in antibiotic degradation efficiency and long in degradation duration.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment, and more specifically, to a biomass fiber material, a preparation method, and an application in degrading antibiotics in water. Background Art

[0002] Antibiotic contamination of water bodies has become a global environmental issue. Due to the overuse of antibiotics in healthcare, animal husbandry, and aquaculture, large amounts of residual drugs are discharged into water bodies. Conventional water treatment processes are unable to effectively degrade these residual drugs, leading to their persistence in the environment and the spread of drug-resistant genes, posing a serious threat to ecological security and human health. Tetracyclines, widely used in healthcare and aquaculture, are among the most frequently detected antibiotics in aquatic environments. Therefore, the development of efficient, low-cost, and green degradation technologies has become a pressing issue in the environmental field.

[0003] In the prior art, Chinese patent CN117186426A discloses a method for preparing and using modified iron-based MOFs. This material modifies MIL-101(Fe) by adding a quinone group (anthraquinone-2-sulfonate sodium) (AQS), effectively improving the Fenton oxidation efficiency of organic pollutants such as antibiotics. Quinone-modified iron-based MOFs (AQS-MIL-101(Fe)) were used as Fenton reaction catalysts to degrade enrofloxacin, achieving a degradation rate of 90%. The preparation and application of these modified iron-based MOFs increased the degradation rate by 0.26-0.29 times compared to unmodified MIL-101(Fe) as a catalyst.

[0004] The modifying material quinone (anthraquinone-2-sodium sulfonate) (AQS) of the above-mentioned modified iron-based MOFs is toxic, and the toxic anthraquinone remains on the surface of the modified iron-based MOFs after the modification. Although the modified iron-based MOFs finally prepared achieve a high degradation rate for antibiotics in water, they have the disadvantage of introducing new toxic substances into the water body, and do not belong to green degradation technology. Summary of the Invention

[0005] In order to solve the problem of efficiently degrading antibiotics in water without destroying the water ecology, the present application provides a preparation of a biomass fiber material and its application in degrading antibiotics in water.

[0006] In a first aspect, the present application provides a biomass fiber material, which adopts the following technical solution: A biomass fiber material comprises the following substances in parts by weight: 0.1-0.5 parts of an amphiphilic compound, 0.5-2 parts of carbon fibers, 1-3 parts of carbon nanotubes, 3-5 parts of powdered chitosan, 1-8 parts of ferric acetylacetonate and 15-30 parts of glycerol.

[0007] By adopting the above technical scheme, powdered chitosan itself, as a kind of bactericidal biomass material, can form gel, and after powdered chitosan is mixed with carbon fiber, due to the pulling effect of carbon fiber, powdered chitosan can form firm irregular sphere; Amphiphilic compound has hydrophilic end and lipophilic end at both ends respectively, so amphiphilic compound can evenly disperse powdered chitosan and carbon nanotube, so that powdered chitosan and carbon nanotube contact area increases, and treated powdered chitosan and carbon nanotube can be connected; Ferric acetylacetonate can generate ferrous oxide particles under the action of glycerol; Then the biomass fiber material structure prepared by the present application is that ferrous oxide particles loaded by carbon nanotubes are connected to the sphere formed by chitosan and carbon fiber; And ferrous oxide can not only be loaded on carbon nanotubes, but also can be loaded on porous chitosan gel. Ferrous oxide can undergo photoelectric Fenton reaction in water under the action of oxidant, and light accelerates the redox cycle between Fe2+ and Fe3+, thereby rapidly degrading antibiotics in water. The ferroferric oxide loaded on the porous chitosan gel can be slowly released in the water body, thereby prolonging the time for degrading antibiotics and prolonging the time for water treatment.

[0008] Preferably, the carbon fiber is oxidized carbon fiber.

[0009] By adopting the above technical solution, the surface of the oxidized carbon fiber carries hydroxyl groups, carboxyl groups and epoxy groups, which can be tightly connected with the powdered chitosan, so that the irregular spherical particles formed by the oxidized carbon fiber and the powdered chitosan are more stable.

[0010] Preferably, the amphiphilic compound is polysorbate 80.

[0011] By adopting the above technical solution, polysorbate 80 is a food additive, so a small amount of polysorbate 80 is green and harmless. Polysorbate 80 is an amphiphilic polymer that can achieve uniform distribution of hydrophobic carbon nanotubes and hydrophilic powdered chitosan in water, so that the surface-treated carbon nanotubes and powdered chitosan are stably connected.

[0012] Preferably, the weight ratio of the powdered chitosan to the carbon fiber is 1:(0.2-0.4).

[0013] By adopting the above technical solution, since the carbon fibers are used to connect and fix the powdered chitosan, the powdered chitosan needs to be polymerized to expand the volume. The connection and entanglement of the carbon fibers enhances the polymerization strength of the powdered chitosan. The above weight ratio is the optimal weight ratio of powdered chitosan to carbon fibers.

[0014] Preferably, the weight ratio of the powdered chitosan to the carbon nanotubes is 1:(0.1-0.5).

[0015] By adopting the above technical solution, carbon nanotubes are connected to the surface of polymerized powdered chitosan, which is used to increase the content of ferric acetylacetonate connected to the powdered chitosan. The weight ratio of the powdered chitosan to the carbon nanotubes is the optimal weight ratio.

[0016] Preferably, the weight ratio of the carbon nanotubes to ferric acetylacetonate is 1:(0.7-1.5).

[0017] By adopting the above technical solution, the role of ferric acetylacetonate is to form ferroferric oxide, which can be loaded not only on carbon nanotubes but also on porous powdered chitosan. The ferric acetylacetonate loaded on the porous powdered chitosan can delay the reaction time, thereby prolonging the water treatment time. Therefore, the above weight ratio range of carbon nanotubes to ferric acetylacetonate is optimal.

[0018] In a second aspect, the present application provides a method for preparing a biomass fiber material, which adopts the following technical solution.

[0019] A method for preparing a biomass fiber material comprises the following steps: Step 1: oxidizing carbon fibers in oxygen at high temperature to obtain oxidized carbon fibers; and oxidizing carbon nanotubes in oxygen at high temperature to obtain oxidized carbon nanotubes; Step 2, stirring the oxidized carbon fiber and powdered chitosan in water at high speed to obtain biomass fiber balls; Step 3, after the biomass fiber balls are treated with an acidic aqueous solution, the biomass fiber balls, the amphiphilic compound, and the oxidized carbon nanotubes are mixed and stirred in glycerol to obtain a biomass fiber composite; Step 4: After filtering the biomass fiber composite, discard the supernatant, oxidize it at high temperature in oxygen, add it together with ferric acetylacetonate into water, and introduce nitrogen to react to obtain a biomass fiber precursor material; after washing the biomass fiber precursor material with ethanol, obtain a biomass fiber material.

[0020] By adopting the above technical solution, in step 1, the carbon fiber is oxidized so that the surface of the carbon fiber carries some hydroxyl groups, carboxyl groups and the like; in step 2, since the surface functionalized carbon fiber can be connected to the powdered chitosan, and the powdered chitosan with a high concentration can attract each other due to its own hydrogen bond collision under stirring, and finally agglomerate to form irregular spheres; in step 3, after the biomass fiber ball is treated with an acidic aqueous solution, the -OH on the surface can be protonated to a cation, and the two ends of the amphiphilic compound are respectively a hydrophilic end and a lipophilic end, so the amphiphilic compound can evenly disperse the hydrophilic powdered chitosan and the partially lipophilic oxidized carbon nanotubes in the glycerol, thereby increasing the contact area between the oxidized carbon nanotubes and the chitosan spheres, and the oxidized carbon nanotubes can be evenly connected to the chitosan spheres to form a biomass fiber composite; in step 4, since the pores of the biomass fiber composite after treatment in step 3 still contain a large amount of glycerol, glycerol acts as a reducing agent and, together with the solvent water, promotes the formation of ferroferric oxide particles from acetylacetonate iron on the oxidized carbon nanotubes and the biomass fiber balls. The biomass fiber material prepared by the present application is green and environmentally friendly, has a large amount of ferroferric oxide connection, has a high efficiency in degrading antibiotics, and lasts for a long time.

[0021] Preferably, in step 1, the carbon fibers are oxidized in oxygen at 200-300° C. for 1-3 hours to obtain oxidized carbon fibers; and the carbon nanotubes are oxidized in oxygen at 200-300° C. for 1-3 hours to obtain oxidized carbon nanotubes.

[0022] By adopting the above technical solution and the above-mentioned oxidation method in oxygen, the carbon fiber surface can carry hydroxyl groups, carboxyl groups and other groups without being exposed to other harmful reagents, and the experimental process is green and environmentally friendly.

[0023] Preferably, the biomass fiber balls are treated with an aqueous solution with a pH of 3-5 to obtain a surface protonated biomass fiber ball solution; the oxidized carbon nanotubes are treated in an aqueous solution with a pH of 9-11 to obtain surface anionized oxidized carbon nanotubes; the surface protonated biomass fiber balls, amphiphilic polymers and surface anionized oxidized carbon nanotubes are mixed and stirred at a high speed in glycerol to obtain a biomass fiber composite.

[0024] By adopting the above technical solution, in the above steps, after the biomass fiber balls are treated with an aqueous solution with a pH of 3-5, the -OH on the surface of the biomass fiber balls can form protonated cations, and the surface of the surface anionized oxidized carbon nanotubes carries groups such as -COO-, and the surface anionized oxidized carbon nanotubes can be evenly connected to the surface of the surface protonated biomass fiber balls, and finally a biomass fiber composite is prepared.

[0025] In a third aspect, the present application provides an application of biomass fiber materials for the degradation of antibiotics in water bodies, using the following technical solution.

[0026] Hydrogen peroxide needs to be added during the use of biomass fiber materials.

[0027] By adopting the above technical solution, in normal Fenton oxidation, H2O2 reacts with ferrous ions to form active •OH molecules, thereby achieving strong oxidation. Light accelerates the redox cycle between Fe2+ and Fe3+, thereby quickly degrading antibiotics in water.

[0028] In summary, this application has the following beneficial effects: 1. In this application, the biomass fiber material structure is that carbon nanotube-loaded ferroferric oxide particles are connected to a sphere formed by chitosan and carbon fibers; and ferroferric oxide can be loaded not only on carbon nanotubes but also on porous chitosan gel; 2. In this application, ferroferric oxide can undergo a photoelectric Fenton reaction in water under the action of an oxidant. Light accelerates the redox cycle between Fe2+ and Fe3+, thereby rapidly degrading antibiotics in water. 3. In the present application, the ferrosoferric oxide loaded on the porous chitosan gel can be slowly released in the water body, thereby prolonging the time for degradation of antibiotics and prolonging the time for water treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The purpose is to show the concentration-absorbance standard curve of tetracycline, the representative antibiotic substance in this application; Figure 2 The purpose is to demonstrate the reuse performance of the biomass fiber materials prepared in Examples 3 and 6 and Comparative Examples 1, 3, and 4 of the present application. DETAILED DESCRIPTION

[0030] The raw materials of the examples and comparative examples of this application can all be purchased commercially; Carbon nanotubes were purchased from Taizhou Juna New Energy Co., Ltd.; bio-based carbon fibers and lignin carbon fibers were purchased from Hangzhou Jiuli Biomaterials Co., Ltd.; chitosan, purity >99%; polysorbate 80, food grade, active ingredient content >99%; glycerol, active ingredient content >99.999%; ferric acetylacetonate, CAS No. 14024-18-1, active ingredient content >99%; The present application is further described in detail below with reference to the following examples and comparative examples.

[0031] Example Example 1 A method for preparing a biomass fiber material comprises the following steps: Step 1: oxidize 0.5 g of bio-based carbon fibers with a length of 5-6 mm in oxygen at 300° C. for 2 h to obtain oxidized carbon fibers; oxidize 1 g of carbon nanotubes in oxygen at 300° C. for 2 h to obtain oxidized carbon nanotubes; Step 2: oxidized carbon fibers and 3 g of powdered chitosan were stirred in 25 mL of water at a pH of 4 at a speed of 800 rpm to obtain biomass fiber balls; Step 3: After mixing the biomass fiber balls and a hydrochloric acid aqueous solution with a pH of 4 at a speed of 800 rpm, the solvent is discarded by centrifugation at a speed of 200 rpm to obtain surface protonated biomass fiber balls; after mixing the oxidized carbon nanotubes and a sodium hydroxide aqueous solution with a pH of 10 at a speed of 800 rpm, the solvent is discarded by centrifugation at a speed of 200 rpm to obtain surface anionized oxidized carbon nanotubes; the surface protonated biomass fiber balls, 0.5 g of polysorbate 80 and the surface anionized oxidized carbon nanotubes are mixed in 15 g of glycerol, and stirred at a temperature of 100°C at a speed of 500 rpm to obtain a biomass fiber composite.

[0032] Step 4: After filtering out the biomass fiber complex, discard the solvent, oxidize it in oxygen at 300°C for 1 hour, add it together with 1g of ferric acetylacetonate into 25mL of water, introduce nitrogen, and react at a stirring speed of 800rpm for 1 hour to obtain a biomass fiber precursor material; after washing the biomass fiber precursor material with 50mL of ethanol, centrifuge it at 100rpm to discard the ethanol to obtain a biomass fiber material.

[0033] Example 2 A method for preparing a biomass fiber material comprises the following steps: Step 1: oxidize 2g of lignin carbon fibers with a length of 5-6mm in oxygen at 200°C for 2h to obtain oxidized carbon fibers; oxidize 3g of carbon nanotubes in oxygen at 200°C for 2h to obtain oxidized carbon nanotubes; Step 2: oxidized carbon fibers and 5 g of powdered chitosan were stirred in 25 mL of water at a pH of 4 at a speed of 800 rpm to obtain biomass fiber balls; Step 3: After mixing the biomass fiber balls and a hydrochloric acid aqueous solution with a pH of 4 at a speed of 800 rpm, the solvent is discarded by centrifugation at a speed of 200 rpm to obtain surface protonated biomass fiber balls; after mixing the oxidized carbon nanotubes and a sodium hydroxide aqueous solution with a pH of 10 at a speed of 800 rpm, the solvent is discarded by centrifugation at a speed of 200 rpm to obtain surface anionized oxidized carbon nanotubes; the surface protonated biomass fiber balls, 0.1 g of polysorbate 80 and the surface anionized oxidized carbon nanotubes are mixed in 30 g of glycerol, and stirred at a temperature of 100°C at a speed of 500 rpm to obtain a biomass fiber composite.

[0034] Step 4: Filter the biomass fiber composite and discard the solvent, oxidize it in oxygen at 200°C for 1 hour, add it together with 8g of ferric acetylacetonate into 25mL of water, introduce nitrogen, and react at a stirring speed of 800rpm for 1 hour to obtain a biomass fiber precursor material; wash the biomass fiber precursor material with 50mL of ethanol, centrifuge it at 100rpm to discard the ethanol, and obtain a biomass fiber material.

[0035] Example 3 A method for preparing a biomass fiber material comprises the following steps: Step 1: oxidize 1g of bio-based carbon fibers with a length of 5-6mm in oxygen at 250°C for 2h to obtain oxidized carbon fibers; oxidize 2g of carbon nanotubes in oxygen at 250°C for 2h to obtain oxidized carbon nanotubes; Step 2: oxidized carbon fibers and 4 g of powdered chitosan were stirred in 25 mL of water at a pH of 4 at a speed of 800 rpm to obtain biomass fiber balls; Step 3: After mixing the biomass fiber balls and a hydrochloric acid aqueous solution with a pH of 4 at a speed of 800 rpm, the solvent is discarded by centrifugation at a speed of 200 rpm to obtain surface protonated biomass fiber balls; after mixing the oxidized carbon nanotubes and a sodium hydroxide aqueous solution with a pH of 10 at a speed of 800 rpm, the solvent is discarded by centrifugation at a speed of 200 rpm to obtain surface anionized oxidized carbon nanotubes; the surface protonated biomass fiber balls, 0.3 g of polysorbate 80 and the surface anionized oxidized carbon nanotubes are mixed in 20 g of glycerol, and stirred at a temperature of 100°C at a speed of 500 rpm to obtain a biomass fiber composite.

[0036] Step 4: After filtering out the biomass fiber complex, discard the solvent, oxidize it in oxygen at 250°C for 1 hour, add it together with 4g of ferric acetylacetonate into 25mL of water, introduce nitrogen, and react at a stirring speed of 800rpm for 1 hour to obtain a biomass fiber precursor material; after washing the biomass fiber precursor material with 50mL of ethanol, centrifuge it at 100rpm to discard the ethanol to obtain a biomass fiber material.

[0037] Example 4 The difference from Example 3 is that when the powdered chitosan in step 2 is 4 g, the weight ratio of the powdered chitosan to the carbon fiber is 1:0.3; Example 5 The difference from Example 3 is that when the powdered chitosan in step 2 is 4 g, the weight ratio of the powdered chitosan to the carbon fiber is 1:0.3; and the weight ratio of the powdered chitosan to the carbon nanotubes is 1:0.65.

[0038] Example 6 The difference from Example 3 is that when the powdered chitosan in step 2 is 4 g, the weight ratio of powdered chitosan to carbon fiber is 1:0.3; the weight ratio of powdered chitosan to carbon nanotubes is 1:0.65; and the weight ratio of carbon nanotubes to ferric acetylacetonate is 1:1.

[0039] Comparative Example Comparative Example 1 The difference from Example 3 is that in step 1, the carbon fibers and carbon nanotubes are not oxidized in oxygen.

[0040] Comparative Example 2 The difference from Example 3 is that polysorbate 80 is not added in step 3.

[0041] Comparative Example 3 The difference from Example 3 is that no oxidized carbon fiber is added in step 2.

[0042] Comparative Example 4 The difference from Example 3 is that no carbon nanotubes are added in step 2.

[0043] Comparative Example 5 The difference from Example 3 is that the ferric acetylacetonate in step 4 is replaced by an equal weight of ferric dichloride.

[0044] Comparative Example 6 The difference from Example 3 is that the ferric acetylacetonate in step 4 is replaced by an equal weight of ferric hydroxide.

[0045] Comparative Example 7 The difference from Example 3 is that the glycerol in step 3 is replaced by an equal weight of water.

[0046] Performance testing Detection method 1. Establish a tetracycline standard curve: Take tetracycline as an example to establish a tetracycline standard curve. The maximum absorption wavelength of tetracycline is 357 nm. Use a Hitachi-UH4150 UV-Vis-NIR spectrophotometer to detect the concentration of the tetracycline solution. The concentration gradient of the tetracycline aqueous solution is 2, 4, 6, 8, and 10 mg / L. Establish a "X-axis concentration-Y-axis absorbance" standard curve. The results are shown in the appendix of the instruction manual. Figure 1 middle; 2. Detecting the degradation rate of tetracycline in sample water by biomass fiber materials: 13 parts of 8 mg / L tetracycline were prepared as the sample to be tested, and the biomass fiber materials and 100 mM H2O2 were added to the sample to be tested. The reaction time was 120 min, the reaction temperature was 25°C, and the stirring speed was 5 rpm. The degradation rate of tetracycline in the sample by the biomass fiber materials prepared in Examples 1-6 and Comparative Examples 1-7 was tested. The absorbance of the biomass fiber materials before and after being added to the same sample was respectively measured. The tetracycline concentration before and after the biomass fiber materials were added to the same sample was calculated using the "X-axis concentration-Y-axis absorbance" standard curve. Degradation rate = (1-Ct / C0) × 100%; Where C0 is the initial concentration of the tetracycline aqueous solution, Ct is the residual concentration of tetracycline after reaction time t, and the test results are shown in Table 1 below; 3. Reusability of biomass fiber materials: After the catalytic experiment, the biomass fiber materials prepared in Example 3, Example 6, Comparative Example 1, Comparative Example 3, and Comparative Example 4 were washed three times with ethanol and three times with deionized water, and the same catalytic experiment in 2 was repeated to test their reusability. The test results are shown in the appendix of the specification. Figure 2 middle.

[0047] Table 1 Combining the data of Examples 1, 2, and 3, it can be seen that the only difference between Examples 1, 2, and 3 is the different raw material composition ratios. The degradation rate of the biomass fiber material in Example 3 is higher than that of the biomass fiber material in Examples 1 and 2. Therefore, the raw material composition of Example 3 is the optimal ratio for preparing the biomass fiber material.

[0048] The difference between Example 4 and Example 3 is that the weight ratio of powdered chitosan and carbon fiber in Example 4 is 1:0.3. The results show that the degradation rate of biomass fiber material in Example 4 is higher than that of biomass fiber material in Example 3. Therefore, the optimal weight ratio of powdered chitosan and carbon fiber in this application is 1:0.3.

[0049] The difference between Example 5 and Example 3 is that the weight ratio of powdered chitosan and carbon fiber is 1:0.3, the weight ratio of powdered chitosan and carbon nanotubes is 1:0.65, and the degradation rate of biomass fiber material in Example 5 is higher than the degradation rate of biomass fiber material in Example 4. Therefore, the weight ratio of powdered chitosan and carbon nanotubes in this application is 1:0.65.

[0050] The difference between Example 6 and Example 3 is that the weight ratio of powdered chitosan to carbon fiber is 1:0.3, the weight ratio of powdered chitosan to carbon nanotubes is 1:0.65, and the weight ratio of carbon nanotubes to ferric acetylacetonate is 1:1. The degradation rate of the biomass fiber material in Example 6 is higher than that of the biomass fiber material in Example 5; and the specification is attached. Figure 2 It can be seen that the degradation rate of the biomass fiber material prepared in Example 6 can still reach 73.6% after 5 repeated uses, while the degradation rate of the biomass fiber material prepared in Example 3 is 53.4% ​​after 5 repeated uses. Therefore, the weight ratio of the carbon nanotubes and ferric acetylacetonate in the present application is 1:1; the biomass fiber material prepared in Example 6 has a high degradation rate and good reusability. When put into water, the area of ​​water where antibiotics are degraded is large.

[0051] In Comparative Example 1, both the bio-based carbon fiber and the carbon nanotube were not oxidized by high temperature. The results showed that the degradation rate of the biomass fiber material in Example 3 was higher than that of the biomass fiber material in Comparative Example 1. Figure 2 It can be seen that when the biomass fiber material is used for the fifth time, the degradation rate is close to 0%, which proves that both bio-based carbon fibers and carbon nanotubes need to be oxidized at high temperature to prepare biomass fiber materials with good antibiotic degradation performance.

[0052] In Comparative Example 2, polysorbate 80 was not added in step 3. The results showed that the degradation rate of the biomass fiber material in Example 3 was higher than that of the biomass fiber material in Comparative Example 2, proving that polysorbate 80 is indispensable in the preparation process of the biomass fiber material.

[0053] In comparative examples 3 and 4, oxidized carbon fibers and oxidized carbon nanotubes were not added in step 2. The results showed that the degradation rate of the biomass fiber material in Example 3 was higher than that of the biomass fiber material in comparative examples 3 and 4. Figure 2 It can be seen that the degradation rate of the biomass fiber material prepared by Comparative Example 3 in the fifth use is close to 0%, and the degradation rate of the biomass fiber material prepared by Comparative Example 4 in the third use is close to 0%, which proves that oxidized carbon fibers and oxidized carbon nanotubes are indispensable in the preparation process of biomass fiber materials.

[0054] In Comparative Examples 5 and 6, ferric acetylacetonate was replaced with ferric dichloride and ferric hydroxide of equal weight. The results showed that the degradation rate of the biomass fiber material in Example 3 was higher than that of the biomass fiber material in Comparative Examples 5 and 6; this proved that the degradation rate performance of the biomass fiber material prepared by ferric acetylacetonate was better than that of the biomass fiber material prepared by ferric dichloride and ferric hydroxide.

[0055] In Comparative Example 7, the glycerol in step 3 was replaced by an equal weight of water. The results showed that the degradation rate of the biomass fiber material in Example 3 was much higher than that of the biomass fiber material in Comparative Example 7, proving that glycerol cannot be replaced by water in step 3 of preparing the biomass fiber material.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A biomass fiber material, characterized in that: The invention comprises the following substances in parts by weight: 0.1-0.5 parts of amphiphilic compound, 0.5-2 parts of carbon fiber, 1-3 parts of carbon nanotube, 3-5 parts of powdered chitosan, 1-8 parts of ferric acetylacetonate and 15-30 parts of glycerol.

2. The biomass fiber material according to claim 1, characterized in that: The carbon fiber is oxidized carbon fiber.

3. The biomass fiber material according to claim 1, characterized in that: The amphiphilic compound is polysorbate 80.

4. The biomass fiber material according to claim 1, characterized in that: The weight ratio of the powdered chitosan to the carbon fiber is 1:(0.2-0.4).

5. The biomass fiber material according to claim 1, characterized in that: The weight ratio of the powdered chitosan to the carbon nanotubes is 1:(0.5-0.8).

6. The biomass fiber material according to claim 1, characterized in that: The weight ratio of the carbon nanotubes to iron acetylacetonate is 1:(0.7-1.5).

7. A method for preparing a biomass fiber material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: oxidizing carbon fibers in oxygen at high temperature to obtain oxidized carbon fibers; and oxidizing carbon nanotubes in oxygen at high temperature to obtain oxidized carbon nanotubes; Step 2, stirring the oxidized carbon fiber and powdered chitosan in water at high speed to obtain biomass fiber balls; Step 3, after the biomass fiber balls are treated with an acidic aqueous solution, the biomass fiber balls, the amphiphilic compound, and the oxidized carbon nanotubes are mixed and stirred in glycerol to obtain a biomass fiber composite; Step 4: After filtering the biomass fiber composite, discard the supernatant, oxidize it at high temperature in oxygen, add it together with ferric acetylacetonate into water, and introduce nitrogen to react to obtain a biomass fiber precursor material; after washing the biomass fiber precursor material with ethanol, obtain a biomass fiber material.

8. The method for preparing a biomass fiber material according to claim 7, characterized in that: In step 1, the carbon fibers are oxidized in oxygen at 200-300° C. for 1-3 hours to obtain oxidized carbon fibers; and the carbon nanotubes are oxidized in oxygen at 200-300° C. for 1-3 hours to obtain oxidized carbon nanotubes.

9. The method for preparing a biomass fiber material according to claim 7, characterized in that: In the step 3, the biomass fiber balls are treated with an aqueous solution having a pH of 3-5 to obtain a surface protonated biomass fiber ball solution; the oxidized carbon nanotubes are treated in an aqueous solution having a pH of 9-11 to obtain surface anionized oxidized carbon nanotubes; and the surface protonated biomass fiber balls, the amphiphilic polymer and the surface anionized oxidized carbon nanotubes are mixed and stirred at a high speed in glycerol to obtain a biomass fiber composite.

10. An application of the biomass fiber material according to any one of claims 1 to 6 for degradation of antibiotics in water, characterized in that: The biomass fiber material needs to be added with hydrogen peroxide during use.

Images