Fiber material for antibacterial adsorption and purification of drinking water and preparation method and application thereof

Abstract

The present invention belongs to the technical field of drinking water purification, and discloses a fiber material for antibacterial adsorption and purification of drinking water, and a preparation method and application thereof. The preparation method of the fiber material for antibacterial adsorption and purification of drinking water comprises the following steps: (1) introducing an acidic group on the surface of a carbon fiber to obtain a first modified fiber; (2) introducing an amino group on the surface of the first modified fiber to obtain a second modified fiber; (3) introducing a halogenated amino group on the surface of the second modified fiber to obtain a fiber material for antibacterial adsorption and purification of drinking water. The process of the present invention is simple and controllable, and easy to implement. The obtained fiber material has dual purification functions of antibacterial and adsorption, good stability, and no new pollution in the effluent. It is very suitable for drinking water purification applications and has good practicality.

Description

Technical Field

[0001] The invention relates to the technical field of drinking water purification, and in particular to a fiber material for antibacterial adsorption and purification of drinking water, and a preparation method and application thereof. Background Art

[0002] Water purifiers meet people's needs for clean water sources. In the standard of whether the water from the water purifier is drinkable, the microbial index is the top priority. Whether the microbial content meets the standard determines whether the water from the water purifier can be directly drunk. At present, fiber filter membranes and silver-loaded activated carbon materials are commonly used in water purifiers for antibacterial and sterilization. The above two have certain defects to a certain extent. The former requires a certain pressure and is relatively expensive, and the latter may have metal dissolution in a water-soluble state, resulting in failure to meet the drinking water metal index. Therefore, based on the above problems, it is particularly important to study a filter material that can both resist bacteria and ensure that the effluent water is free of new pollution. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fiber material for antibacterial adsorption and purification of drinking water with good antibacterial effect and no new pollution in effluent water, as well as a preparation method and application thereof.

[0004] In order to achieve the above object, the present invention first provides a method for preparing a fiber material for antibacterial adsorption and purification of drinking water, and the technical scheme is as follows:

[0005] The method for preparing a fiber material for antibacterial adsorption and purification of drinking water comprises the following steps:

[0006] (1) introducing acidic groups on the surface of carbon fiber to obtain a first modified fiber;

[0007] (2) introducing amino groups on the surface of the first modified fiber to obtain a second modified fiber;

[0008] (3) Introducing halogenated amino groups onto the surface of the second modified fiber to obtain a fiber material for antibacterial adsorption and purification of drinking water.

[0009] In the above-mentioned preparation method, acidic groups are first introduced on the surface of carbon fibers to increase the hydrophilicity and reactivity of the fiber surface, provide necessary chemical active sites for the subsequent introduction of amino and halogen amino groups, enhance the adhesion of the modified groups, and avoid new pollution; this step also improves the adsorption capacity of the fiber with pollutants in water (especially positively charged microorganisms, metal ions, etc.), thereby providing a good foundation for the purification process. Secondly, the introduction of amino groups on the surface of the first modified fiber can increase its adsorption capacity for negatively charged pollutants; at the same time, the amino groups provide reaction sites for the subsequent introduction of halogen amino groups, and the subsequent steps can be carried out smoothly through the reactivity of the amino groups. Then, the introduction of halogen amino groups on the surface of the second modified fiber can inhibit or kill bacteria and other microorganisms in water by contact sterilization or release of active halogens, which can give the fiber material strong antibacterial properties; the introduction of halogen amino groups at the end can ensure that the halogen activity is not disturbed.

[0010] In summary, the present invention gradually modifies and enhances the surface of carbon fibers by introducing acidic groups, amino groups and halogenated amino groups, and the obtained fiber materials have the following effects: (1) Highly effective antibacterial properties: The introduction of halogenated amino groups gives the material strong antibacterial properties, which can quickly inhibit or kill bacteria in water after contact, reducing water microbial contamination. (2) Excellent adsorption capacity: The introduction of acidic groups and amino groups enables the fiber material to have the ability to adsorb charged impurities, and can remove pollutants in water, including metal ions, charged particles, etc., thereby improving the purification effect. (3) Surface stability: The modified carbon fiber has good stability in different environments, strong durability, suitable for long-term use, and reduces the need for frequent replacement. (4) Dual purification function: The material has dual purification functions of antibacterial and adsorption, which meets the needs of debacterization and de-impurity in drinking water, and provides comprehensive protection for water quality safety.

[0011] As a further improvement of the above-mentioned preparation method of the fiber material for antibacterial adsorption and purification of drinking water, it also includes pre-treating the carbon fiber, including the steps of:

[0012] The carbon fiber is soaked once with an organic solvent;

[0013] The carbon fiber is soaked twice in a weak alkaline solution;

[0014] The carbon fiber was immersed in a strong acid solution for three times.

[0015] Preferably, ultrasound is used for auxiliary treatment during each soaking;

[0016] The solid-liquid ratio for each soaking is 1g:(30-50)mL;

[0017] After each soaking, the fibers are collected and washed with pure water until neutral;

[0018] The immersion is performed using at least one of acetone, ethyl acetate and n-hexane for 30 to 150 minutes;

[0019] The second soaking uses a weak alkaline solution with a pH of 8 to 8.5, and the soaking time is 15 to 30 minutes;

[0020] The three soakings use a strong acid solution with a pH of 2 to 2.5, and the soaking time is 3 to 6 minutes.

[0021] First, impurities such as oil, impurities or adsorbed organic matter on the surface of carbon fiber that may affect subsequent chemical reactions are removed by soaking once, significantly improving the surface physical state of carbon fiber and increasing the reactivity of the fiber surface. Secondly, some weakly acidic or acidic impurities on the fiber surface and fine impurities that are difficult to remove with organic solvents are removed by soaking twice, and a small amount of negative charge is generated on the fiber surface, which increases the affinity of the fiber surface for the subsequent introduction of acidic groups. Soaking in organic solvents and weak alkaline solutions first can remove impurities without strongly corroding the carbon fiber, avoid excessive damage caused by strong acid treatment at the beginning, and ensure the mechanical strength and structural integrity of the carbon fiber. Finally, the carbon fiber surface is etched and activated with a strong acid solution to increase the surface roughness, hydrophilicity and reactivity. The increase in surface roughness can increase the specific surface area of ​​the fiber, thereby increasing the amount of group introduction, and then improving the antibacterial and adsorption properties.

[0022] As a further improvement to the preparation method of the fiber material for antibacterial adsorption and purification of drinking water, in step (1), the carbon fiber is soaked in a weak acid solution with a pH of 5.5 to 6.5, the solid-liquid ratio of the carbon fiber to the weak acid solution is 1 g: (30 to 50) mL, and the soaking time is 30 to 60 min. After soaking, the fiber is collected and washed with pure water until neutral, thereby obtaining a first modified fiber with an acidic group. Thus, by introducing the acidic group by soaking in a weak acidic solution, the acidic group can be slowly introduced on the fiber surface at a relatively low concentration, thereby avoiding excessive corrosion or structural damage. In addition, the reaction rate of the weak acid is relatively slow, which makes the process of introducing the acidic group easier to control, and the acid concentration and soaking time can be adjusted according to the experimental requirements to obtain an appropriate surface activation effect.

[0023] As a further improvement of the preparation method of the above-mentioned fiber material for antibacterial adsorption and purification of drinking water: in step (2), the first modified fiber is soaked in a modification solution with a pH of 10.5 to 11.5, a solvent of water and ethanol, and a solute of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane for 60 to 120 minutes, and a second modified fiber with amino groups is obtained after soaking. N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane has two amino groups (-NH and -NH2) as active sites, and the surface of the first modified fiber can be modified under relatively mild conditions without the use of strong alkali or other harsh conditions. It has higher flexibility, versatility and biocompatibility, and can significantly improve the hydrophilicity of the purification material.

[0024] As a further improvement of the preparation method of the fiber material for antibacterial adsorption and purification of drinking water, in step (3), the pH of the modified solution is adjusted to 7-8 with pure water, and then a NaClO solution is added dropwise to the modified solution. After the addition of the NaClO solution, the reaction is carried out for 30-240 minutes to allow the amino group to react with the ClO. - The reaction generates halogenated amino groups, and then the fibers are collected and washed with pure water until they are neutral, thus obtaining a fiber material for antibacterial adsorption and purification of drinking water. - The halogenated amino group (such as chloramine, -NHCl or -NCl2) generated by the reaction can be used to kill bacteria and viruses of microorganisms by releasing chloride ions. When the antibacterial effect decreases, the material can be regenerated by eluting with ClO-. In addition, the halogenated amino group has good stability and is not easily dissociated under neutral or weak acid and base conditions, which can significantly improve the durability of the material and reduce surface degradation or corrosion.

[0025] As a further improvement to the preparation method of the above-mentioned fiber material for antibacterial adsorption and purification of drinking water: the volume ratio of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, water and ethanol in the modified solution is 1:5:15, and equal volume immersion is adopted; the solid-liquid ratio of the second modified fiber to the NaClO solution is 1g:(0.2~4)mL, and the mass fraction of the NaClO solution is 8~12%.

[0026] As a further improvement to the preparation method of the above-mentioned fiber material for antibacterial adsorption and purification of drinking water: in step (3), after the introduction of the halogenated amino group, titanium dioxide is continuously introduced and / or ultraviolet irradiation is used to obtain the fiber material for antibacterial adsorption and purification of drinking water. The halogenated amino group also has polarity and reactivity, which helps the attachment and activation of metal ions (such as silver ions) or inorganic particles (such as titanium dioxide), and is not easy to fall off or powder during use; the further introduced titanium dioxide has photocatalytic activity and can produce reactive oxygen species (ROS) under light conditions, effectively killing bacteria and viruses. Ultraviolet rays (especially UV-C light) can destroy the DNA or RNA of microorganisms, achieving a better sterilization effect. In particular, it is preferred to introduce ultraviolet rays after the titanium dioxide is introduced, which can enhance the photocatalytic activity of titanium dioxide.

[0027] In order to achieve the above object, the present invention provides a fiber material for antibacterial adsorption and purification of drinking water, and the technical scheme is as follows:

[0028] The fiber material for antibacterial adsorption and purification of drinking water is prepared by adopting the above-mentioned preparation method.

[0029] In order to achieve the above object, the present invention further provides a drinking water purification element, and the technical solution is as follows:

[0030] The drinking water purification element comprises the fiber material for antibacterial adsorption and purification of drinking water prepared by the above preparation method.

[0031] In summary, the preparation method of the fiber material for antibacterial adsorption and purification of drinking water of the present invention is simple and controllable, easy to implement, and the obtained fiber material has dual purification functions of antibacterial and adsorption, good stability, and no new pollution in the effluent water. It is very suitable for drinking water purification applications and has good practicality.

[0032] The following is a further description of the embodiments of the invention provided in this specification in conjunction with the accompanying drawings and specific implementation methods. Additional aspects and advantages of the embodiments of the invention provided in this specification will be partially given in the following description, and partially will become apparent from the following description, or will be understood through the practice of the embodiments of the invention provided in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings that constitute part of the embodiments of the inventions provided in this specification are used to assist in understanding the embodiments of the inventions provided in this specification. The contents provided in the drawings and their related descriptions in the embodiments of the inventions provided in this specification can be used to explain the embodiments of the inventions provided in this specification, but do not constitute improper limitations on the embodiments of the inventions provided in this specification.

[0034] Figure 1This is a low-magnification SEM photograph of the fiber material for antibacterial adsorption and purification of drinking water according to Example 6 of the present invention.

[0035] Figure 2 This is a high-magnification SEM photograph of the fiber material for antibacterial adsorption and purification of drinking water according to Example 6 of the present invention.

[0036] Figure 3 This is the XPS spectrum of the fiber material for antibacterial adsorption and purification of drinking water according to Example 6 of the present invention. DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the embodiments of the inventions provided in this specification in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the embodiments of the inventions provided in this specification based on these descriptions. Before describing the embodiments of the inventions provided in this specification in conjunction with the accompanying drawings, it should be particularly noted that:

[0038] The technical solutions and technical features provided in each part of the embodiments of the invention provided in this specification, including the following description, may be combined with each other if there is no conflict.

[0039] In addition, the embodiments of the inventions provided in this specification involved in the following descriptions are generally only a partial embodiment of the embodiments of the inventions provided in this specification rather than all the embodiments. Therefore, based on the embodiments of the inventions provided in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of the embodiments of the inventions provided in this specification.

[0040] Regarding the terms and units in the embodiments of the inventions provided in this specification: The terms "including", "comprising", "having" and any variations thereof in the descriptions and claims of the embodiments of the inventions provided in this specification and in the related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units in the embodiments of the inventions provided in this specification can be reasonably interpreted based on the relevant contents of the embodiments of the inventions provided in this specification.

[0041] The specific implementation of the fiber material for antibacterial adsorption and purification of drinking water and the preparation method thereof of the present invention comprises the following steps:

[0042] (1) Pre-treating carbon fiber, including the steps of:

[0043] The carbon fiber was soaked once with acetone for 90 min;

[0044] The carbon fiber is immersed twice in a weak alkaline solution with a pH of 8, wherein the weak alkaline solution is a sodium acetate solution, and the immersion time is 20 minutes;

[0045] The carbon fiber is soaked three times in a strong acid solution with a pH of 2, wherein the strong acid solution is a mixed acid solution of nitric acid and sulfuric acid, the molar ratio of nitric acid to sulfuric acid is (1-3):(1-3), and the soaking time is 3-6 minutes;

[0046] Ultrasonic treatment was used for auxiliary treatment each time the immersion was performed; the solid-liquid ratio of each immersion was 1 g:40 mL; after each immersion the fibers were collected and washed with pure water until they were neutral.

[0047] (2) Introducing acidic groups on the surface of carbon fiber to obtain a first modified fiber, specifically: soaking the carbon fiber in a weak acid solution with a pH of 6, wherein the weak acid solution is at least one of oxalic acid solution, acetic acid solution, citric acid solution, and phosphoric acid solution, and the solid-liquid ratio of the carbon fiber to the weak acid solution is 1 g:40 mL. The soaking time is 30 to 60 min. After soaking, the fiber is collected and washed with pure water until it is neutral, thereby obtaining a first modified fiber with an acidic group.

[0048] (3) Introducing amino groups on the surface of the first modified fiber to obtain a second modified fiber, specifically: using a modification solution with a pH of 11 (adjusted by sodium hydroxide), a solvent of water and ethanol, and a solute of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane to immerse the first modified fiber in equal volumes, wherein the volume ratio of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, water and ethanol in the modification solution is 1:5:15, and the immersion time is 60 to 120 minutes, and the immersion is accompanied by stirring. After the immersion, a second modified fiber with amino groups is obtained.

[0049] (4) Introducing halogenated amino groups on the surface of the second modified fiber to obtain a fiber material for antibacterial adsorption and purification of drinking water, specifically: adjusting the pH of the modified solution to 7.5 with pure water, and then dropping a NaClO solution into the modified solution, the solid-liquid ratio of the second modified fiber to the NaClO solution is 1 g: (0.2-4) mL, the mass fraction of the NaClO solution is 10%, and after the NaClO solution is added, the reaction is carried out for 30-240 min to allow the amino groups to react with the ClO solution. - The reaction generates halogen amino groups, and then the fibers are collected and washed with pure water until they are neutral, thereby obtaining a fiber material for antibacterial adsorption and purification of drinking water.

[0050] The test parameters and antibacterial properties of Examples 1-8 are shown in Table 1.

[0051] Table 1

[0052]

[0053] Example 9: Compared with Example 6, the fiber material for antibacterial adsorption and purification of drinking water and the preparation method thereof in this example are different in that after the generation of the halogen amino group, the fiber is collected and washed with pure water until it is neutral, and after the fiber is dried, titanium dioxide is further loaded. The specific method is:

[0054] Prepare the titanium source alcohol solution: dissolve 2 mL of tetrabutyl titanate in 50 mL of anhydrous ethanol;

[0055] Prepare acidic aqueous solution: add 0.5 mL of 37% concentrated hydrochloric acid to 50 mL of pure water;

[0056] The fiber was immersed in the titanium source alcohol solution, and then the acidic aqueous solution was slowly added dropwise, and stirred at room temperature for 2 hours after the addition was completed;

[0057] The fibers are taken out, washed with deionized water and then dried to obtain fiber materials for antibacterial adsorption and purification of drinking water.

[0058] After testing, the diameter of the antibacterial ring of the fiber material of this embodiment is 5.9 mm.

[0059] Example 10: Compared with Example 6, the fiber material for antibacterial adsorption and purification of drinking water and the preparation method thereof of this example are different in that after the halogenated amino groups are generated, the fibers are collected and washed with pure water until they are neutral. After the fibers are dried, they are further irradiated with ultraviolet rays using the UVC band, with a distance of 15 cm between the light source and the fibers, and irradiated at an intensity of 40 mW / cm² for 30 minutes to obtain the fiber material for antibacterial adsorption and purification of drinking water.

[0060] After testing, the diameter of the antibacterial ring of the fiber material of this embodiment is 5.8 mm.

[0061] Example 11: Compared with Example 6, the fiber material for antibacterial adsorption and purification of drinking water and the preparation method thereof of this example are different in that after the halogenated amino groups are generated, the fibers are collected and washed with pure water until they are neutral. After the fibers are dried, titanium dioxide is first loaded by the method of Example 9, and then ultraviolet rays are irradiated by the method of Example 10 to obtain the fiber material for antibacterial adsorption and purification of drinking water.

[0062] After testing, the diameter of the antibacterial ring of the fiber material of this embodiment is 6.1 mm.

[0063] Example 12: Compared with Example 6, the fiber material for antibacterial adsorption and purification of drinking water and the preparation method thereof in this example are different in that after the generation of the halogen amino group, the fiber is collected and washed with pure water until it is neutral, and after the fiber is dried, titanium dioxide is loaded by photochemical deposition method, and the specific method is as follows:

[0064] Prepare titanium precursor solution: dissolve 2 mL of tetraisopropyl titanate and 0.5 mL of glacial acetic acid in 50 mL of anhydrous ethanol;

[0065] The fiber was immersed in a quartz reactor containing a titanium precursor solution, using the UVC band, with a distance of 15 cm between the light source and the fiber, and irradiated at an intensity of 30 mW / cm² for 3 hours;

[0066] The fibers are taken out, washed with deionized water and then dried to obtain fiber materials for antibacterial adsorption and purification of drinking water.

[0067] After testing, the diameter of the antibacterial ring of the fiber material of this embodiment is 6.4 mm.

[0068] In the above embodiments, the carbon fiber can be but is not limited to being obtained by heat treating at 500-1000°C for 1-3 hours any one of polyaramid fiber, polyacrylonitrile fiber, asphalt fiber, phenolic fiber, cellulose fiber, flax fiber, jute fiber, palm fiber, cotton fiber, oil palm fiber, silkworm cocoon waste, sisal fiber, and plant pulp fiber in an oxygen-free environment.

[0069] In Example 6, the diameter of the antibacterial ring of the carbon fiber obtained by carbonizing the polyaramid fiber is 0.9 mm, the diameter of the antibacterial ring of the first modified fiber is 1.3 mm, and the diameter of the antibacterial ring of the second modified fiber is 2.8 mm. If no pretreatment is performed, the antibacterial ring diameter of the fiber material for antibacterial adsorption and purification of drinking water obtained directly is only 4.1 mm.

[0070] Figure 1 This is a low-magnification SEM photograph of the fiber material for antibacterial adsorption and purification of drinking water according to Example 6 of the present invention. Figure 2 This is a high-magnification SEM photo of the fiber material for antibacterial adsorption and purification of drinking water according to Example 6 of the present invention. Figure 1-2 It can be seen that the modified groups were successfully grafted onto the surface of the fiber material, and the modified groups were distributed relatively evenly.

[0071] Figure 3 This is the XPS spectrum of the fiber material for antibacterial adsorption and purification of drinking water according to Example 6 of the present invention. Figure 3 As shown, the fiber material has Cl 2p peak, N 1s peak, and Si 2p peak, indicating that the modified groups have been successfully introduced.

[0072] The antibacterial properties of the above fiber materials were tested by the Kirby-Bauer disk diffusion method:

[0073] 1) Take a colony of E. coli and place it in 10 mL of LB culture medium and culture it at 36°C for 16 hours;

[0074] 2) Take out the bacterial solution and use a spectrophotometer to adjust the concentration of the bacterial solution to meet the McFarland turbidity value of 0.5;

[0075] 3) Dilute the bacterial solution to a concentration of 10 using 0.9% saline. 6 CFU / mL;

[0076] 4) Use a pipette to transfer 0.5 mL of bacterial solution into the MH medium and spread it evenly with a spreading rod.

[0077] 5) Take a certain amount of fiber material and place it in MH medium, culture it at 36℃ for 16 hours, and finally measure the diameter of the antibacterial ring with a vernier caliper; perform three parallel tests on each fiber material, and take the average value of the antibacterial ring diameter.

[0078] An embodiment of the drinking water purification element of the present invention is a fiber material for antibacterial adsorption and purification of drinking water prepared by the preparation method of any of the above embodiments. The water purification element can be but is not limited to any one of a filter membrane structure, a filling column structure, a roll structure, and a pleated structure.

[0079] The above is a description of the relevant contents of the embodiments of the inventions provided in this specification. Based on these descriptions, a person of ordinary skill in the art will be able to implement the embodiments of the inventions provided in this specification. Based on the above contents of the embodiments of the inventions provided in this specification, all other preferred implementations and embodiments obtained by a person of ordinary skill in the art without making any creative work shall fall within the scope of protection of the embodiments of the inventions provided in this specification.

Claims

1. A method for preparing a fiber material for antibacterial adsorption and purification of drinking water, characterized in that: The following steps are involved: (1) introducing acidic groups on the surface of carbon fiber to obtain a first modified fiber; (2) introducing amino groups on the surface of the first modified fiber to obtain a second modified fiber; (3) introducing halogen amino groups on the surface of the second modified fiber to obtain a fiber material for antibacterial adsorption and purification of drinking water; Wherein, in step (1), the carbon fibers are soaked in a weakly acidic solution having a pH of 5.5 to 6.5, and after soaking, the fibers are collected and washed with pure water until they are neutral, thereby obtaining a first modified fiber having an acidic group; In step (2), the first modified fiber is soaked in a modification solution having a pH of 10.5 to 11.5, a solvent of water and ethanol, and a solute of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, to obtain a second modified fiber having an amino group. In step (3), the pH of the modified solution is adjusted to 7-8 with pure water, and then NaClO solution is added dropwise to the modified solution. Then, the fibers are collected and washed with pure water until they are neutral, thereby obtaining a fiber material for antibacterial adsorption and purification of drinking water.

2. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 1, characterized in that: The method also includes pre-treating the carbon fiber, including the steps of: The carbon fiber is soaked once with an organic solvent; The carbon fiber is immersed twice in a weak alkaline solution with a pH of 8 to 8.5; The carbon fiber is immersed three times in a strong acid solution with a pH of 2 to 2.

5.

3. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 2, characterized in that: Ultrasound is used for auxiliary treatment during each immersion; The solid-liquid ratio for each soaking is 1g:(30-50)mL; After each soaking, the fibers are collected and washed with pure water until neutral; At least one of acetone, ethyl acetate and n-hexane is used for a soaking time of 30 to 150 minutes; The soaking time of the second soaking is 15 to 30 minutes; The soaking time for three soakings is 3 to 6 minutes.

4. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 1, characterized in that: In step (1), the solid-liquid ratio of the carbon fiber to the weakly acidic solution is 1 g: (30-50) mL, and the immersion time is 30-60 min.

5. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 1, characterized in that: In step (2), the first modified fiber is soaked for 60 to 120 minutes.

6. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 5, characterized in that: In step (3), after the NaClO solution is added, the reaction is continued for 30 to 240 minutes to allow the amino groups to react with the ClO - The reaction generates a haloamino group.

7. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 6, characterized in that: The volume ratio of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, water and ethanol in the modified solution is 1:5:15, and equal volume immersion is adopted; the solid-liquid ratio of the second modified fiber to the NaClO solution is 1g:(0.2-4)mL, and the mass fraction of the NaClO solution is 8-12%.

8. The method for preparing a fiber material for antibacterial adsorption and purification of drinking water according to claim 1, characterized in that: In step (3), after the introduction of the halogen amino group, titanium dioxide is further introduced and / or ultraviolet irradiation is adopted to obtain a fiber material for antibacterial adsorption and purification of drinking water.

9. A fiber material for antibacterial adsorption and purification of drinking water, characterized in that: The preparation method is described in any one of claims 1 to 8.

10. Drinking water purification element, characterized in that: A fiber material for antibacterial adsorption and purification of drinking water prepared by the preparation method according to any one of claims 1 to 8.

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