Preparation method of surface hydrophilic anti-scale nitrogen adsorption and degradation material

Abstract

The invention discloses a preparation method of a nitrogen and phosphorus adsorption material with a hydrophilic and anti-scale surface. The preparation method comprises the following steps: S1, weighing ceramsite and super-hydrophilic coating modified liquid according to the solid-to-liquid ratio of ceramsite to super-hydrophilic coating modified liquid being 50: (10-1); s2, spraying the super-hydrophilic coating modified liquid to the surface of the mixed and stirred ceramsite in an ultrasonic atomization spraying manner, and continuously stirring and mixing for 20-60 minutes until the surface of the ceramsite is fully wetted and coated by the modified liquid; and S3, drying the ceramsite with the surface coated with the modified liquid at 150-200 DEG C for 5-10 minutes, and sintering at 450-950 DEG C for 20-25 minutes to form a compact self-cleaning coating with a nano-microporous structure on the surface of the ceramsite, thereby obtaining the modified ceramsite with long-acting capability of photocatalytic degradation of nitrate nitrogen and efficient nitrogen and phosphorus adsorption. The composite material can be used for sewage nitrogen and phosphorus adsorption treatment, the outer surface has hydrophilic self-cleaning performance, and nitrate nitrogen can be subjected to photocatalytic degradation.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a method for preparing a nitrogen adsorption and degradation material with hydrophilic and anti-scaling properties. Background Art

[0002] With the continuous development of industry and agriculture, the amount of generated and domestic sewage discharged is increasing, resulting in a continuous increase in the amount of sewage treatment and pushing up the cost of sewage treatment. The excessive nitrogen and phosphorus content in domestic and industrial sewage, in addition to polluting the water body itself, will further cause the rapid reproduction of microorganisms in the water body, aggravating the biological pollution of the water body. At the same time, with the improvement of living standards, residents' awareness of drinking water safety is constantly improving, and we need to reduce the nitrogen and phosphorus content in the surrounding water bodies as much as possible. Reducing the concentration of phosphate and ammonia nitrogen in water bodies and adding low-cost adsorption materials, such as ceramsite, is considered to be one of the most effective methods. However, ordinary nitrogen and phosphorus adsorption materials, such as diatomaceous earth, are limited by the surface adsorption capacity and specific surface area of silica. Therefore, before modification, the adsorption and depollution effect is limited.

[0003] It should be noted that, in addition to ammonia nitrogen, a large part of the nitrogen pollutants in water are nitrate nitrogen. There are two types of nitrogen pollutants, one is anionic and the other is cationic. Therefore, it is difficult for a single adsorption material to simultaneously and efficiently remove two types of nitrogen pollution sources. Photocatalysts represented by titanium dioxide can achieve the photoreduction of nitrate nitrogen and convert it into N2 gas, which is a way to degrade nitrate nitrogen. However, in order to make nitrogen and phosphorus adsorption materials have photocatalytic degradation capabilities, researchers tend to load nano-titanium dioxide directly into ceramsite. However, the specific surface area inside the adsorption material is much larger than the external surface, and it cannot receive light. Therefore, most of the titanium dioxide loaded in the ceramsite cannot play a role in catalytic degradation of nitrate nitrogen, but instead increases the cost of the adsorption material.

[0004] On the other hand, the titanium dioxide on the outer surface of the adsorption material is easily adsorbed by pollutants and organic degradation products in the water during use. It is also easily adsorbed by water molecules and oxygen, resulting in the complete occupation of the active sites of the catalytic reaction. Therefore, whether nano-titanium dioxide is used alone or loaded onto the outer surface of the adsorption material for use, it will gradually lose its photocatalytic activity after a period of time during actual use and will no longer be able to degrade nitrate nitrogen and other pollutants. Therefore, in actual applications, directly loading nano-titanium dioxide to modify the adsorption ceramsite is difficult to apply to actual sewage treatment scenarios.

[0005] Therefore, this paper proposes a preparation method for nitrogen and phosphorus adsorption and degradation materials with hydrophilic and anti-fouling surfaces. Summary of the Invention

[0006] The purpose of the present invention is to design a preparation method of a nitrogen and phosphorus adsorption and degradation material for sewage nitrogen and phosphorus adsorption treatment, with a hydrophilic and anti-scaling outer surface and capable of photocatalytically degrading nitric nitrogen.

[0007] In order to achieve the above technical effects, the present invention is implemented by the following technical solutions: a method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption degradation material, characterized in that it includes the following steps:

[0008] S1. Weigh ceramsite and super-hydrophilic coating modified liquid in a solid-liquid ratio of 50:10-1;

[0009] S2, spraying the super-hydrophilic coating modification liquid onto the surface of the mixed ceramsite by ultrasonic atomization spraying, and continuously stirring and mixing for 20 to 60 minutes until the modification liquid fully wets and coats the surface of the ceramsite;

[0010] S3. The ceramsite with the modified liquid coated on its surface is dried at 150-250° C. for 5-20 min, and then sintered at 450-850° C. for 3-25 min to form a dense self-cleaning coating with a nano-porous structure on the surface of the ceramsite, thereby obtaining modified ceramsite with both long-term photocatalytic degradation of nitrate nitrogen and efficient nitrogen and phosphorus adsorption.

[0011] Furthermore, the ceramsite is one or more of diatomaceous earth, zeolite, fly ash, shale ceramsite, and coal gangue ceramsite.

[0012] Furthermore, the super-hydrophilic coating modification liquid is composed of 100 parts by mass of 10 to 30 parts of nano-titanium dioxide aqueous dispersion, 2 to 5 parts of polyvinyl alcohol resin aqueous solution, 5 to 10 parts of organic solvent, 1 to 10 parts of neutral nano-silica sol, 3 to 10 parts of water-soluble amino resin, and 40 to 66 parts of water.

[0013] Furthermore, the nano-titanium dioxide aqueous dispersion has a solid content of 30% and a particle size of 5 to 20 nm.

[0014] Furthermore, the solid content of the polyvinyl alcohol resin aqueous solution is 5-15%.

[0015] Furthermore, the solid content of the nano neutral silica sol is 10-30% and the particle size is 5-20 nm.

[0016] Furthermore, the water-soluble amino resin is a water-soluble amino resin that can be mixed with water in any proportion, such as Wengkaier W-180 and Wanhua MH-85H.

[0017] Furthermore, the organic solvent is at least one of ethylene glycol monobutyl ether, ethylene glycol monomethyl ether, ethanol, and isopropanol.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention retains the photocatalyst modified layer on the surface of the adsorption ceramsite, which greatly reduces the use of high-cost titanium dioxide photocatalyst, improves the utilization rate of the photocatalyst, and reduces the cost of adsorption materials;

[0020] 2. The present invention utilizes the film-forming and bonding effect of amino water-soluble resin on the outer surface of ceramsite to coat titanium dioxide and nano-silicon dioxide into a film, and sintering forms a self-cleaning coating rich in hydroxyl groups and having nanopores, thereby preventing pollutants in water from forming a stubborn adhesion layer on the titanium dioxide crystals and the surface of ceramsite, resulting in the loss of the adsorption and catalytic ability of the ceramsite;

[0021] 3. The present invention uses nitrogen-containing amino resin to coat titanium dioxide, and then sintering to form nitrogen-doped nano-titanium dioxide with high catalytic activity on the outer surface of the ceramsite. At the same time, the connecting effect of silicon dioxide allows the nano-titanium dioxide and nano-silicon dioxide to form a self-cleaning coating rich in hydroxyl groups and having nanopores;

[0022] 4. The present invention forms a self-cleaning coating with nanopores on the surface of the adsorbent ceramsite. The surface hydroxyl groups rich in the coating are continuously converted into strong oxidizing hydroxyl radicals and reduced electrons under the action of titanium dioxide photocatalyst, and the cycle can prevent water molecules and pollutants from being adsorbed on the titanium dioxide surface, thereby losing the redox ability of the photocatalyst, so that the ceramsite can maintain the ability to reduce nitrate nitrogen in water for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a flow chart for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Example 1

[0027] A method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption degradation material comprises the following steps:

[0028] 1) 30 parts of an aqueous dispersion of nano-titanium dioxide with a particle size of 20 nm and a solid content of 30%, 5 parts of an aqueous solution of a polyvinyl alcohol resin with a solid content of 15%, 10 parts of ethylene glycol monobutyl ether, 10 parts of a neutral silica sol with a particle size of 5 nm and a solid content of 30%, and 5 parts of an aqueous amino resin Wong Kaier W-180 were sequentially added to 40 parts of water and stirred to obtain a modified solution;

[0029] 2) Weigh diatomaceous earth and modifying liquid at a solid-liquid ratio of diatomaceous earth: modifying liquid = 50:10, then spray the modifying liquid onto the surface of the diatomaceous earth ceramsite, and mix it in a mixer for 20 minutes until the modifying liquid fully wets and coats the surface of the ceramsite;

[0030] 3) The modified ceramsite is dried at 150 degrees Celsius for 20 minutes and then sintered at 850 degrees Celsius for 3 minutes. During the sintering process, the organic components of the external modified coating are burned away at high temperature to form an inorganic nanoporous structure self-cleaning coating, which has the ability to photocatalytically degrade nitrate nitrogen and highly efficient nitrogen and phosphorus adsorption ceramsite.

[0031] The diatomite obtained by the modification method described in this embodiment has a saturated adsorption capacity of ammonia nitrogen in water increased by 45% and a saturated adsorption capacity of phosphorus increased by 50% compared with the unmodified diatomite; at the same time, the surface of the modified diatomite exhibits long-lasting super-hydrophilicity and photocatalytic ability. After one year of use in a wetland water environment, it can still catalytically reduce nitrate nitrogen in water under sunlight conditions; under the condition of one hour of irradiation with a xenon lamp of standard sunlight intensity, the ability to photocatalytically reduce 50 mg / L of ammonia nitrogen aqueous solution still retains 75% compared with the initial stage of use.

[0032] Example 2

[0033] A method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption degradation material comprises the following steps:

[0034] 1) 20 parts of an aqueous dispersion of nano-titanium dioxide with a particle size of 5 nm and a solid content of 10%, 4 parts of an aqueous solution of polyvinyl alcohol resin with a solid content of 5%, 10 parts of ethylene glycol monomethyl ether, 10 parts of a neutral silica sol with a particle size of 20 nm and a solid content of 25%, and 6 parts of an aqueous amino resin Wong Kaier W-180 were added to 50 parts of water in sequence and stirred to obtain a modified solution.

[0035] 2) Weigh fly ash ceramsite and modifying liquid at a solid-liquid ratio of fly ash ceramsite: modifying liquid = 50:8, spray the modifying liquid onto the surface of the ceramsite by ultrasonic spraying, and mix with a mixer for 30 minutes until the modifying liquid fully wets and coats the surface of the ceramsite;

[0036] 3) The modified ceramsite is dried at 180 degrees Celsius for 15 minutes and then sintered at 450 degrees Celsius for 20 minutes. During the sintering process, the organic components of the external modified coating are burned away at high temperature to form an inorganic nanoporous self-cleaning coating, which has the ability to photocatalytically degrade nitrate nitrogen and efficiently adsorb nitrogen and phosphorus.

[0037] The fly ash ceramsite obtained by the modification method described in this embodiment has a 35% increase in the adsorption saturation concentration of ammonia nitrogen in water and a 50% increase in the adsorption saturation concentration of phosphorus compared to the unmodified fly ash ceramsite; at the same time, the surface of the modified ceramsite exhibits long-lasting super-hydrophilicity and photocatalytic ability. After one year of use in a wetland water environment, it can still catalytically reduce nitrate nitrogen in water under sunlight conditions; under the condition of one hour of irradiation with a xenon lamp of standard sunlight intensity, the photocatalytic reduction capacity of a 50 mg / L ammonia nitrogen aqueous solution still retains 60% compared to the initial stage of use.

[0038] Example 3

[0039] A method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption degradation material comprises the following steps:

[0040] 1) 10 parts of an aqueous dispersion of nano-titanium dioxide with a particle size of 15 nm and a solid content of 25%, 3 parts of an aqueous solution of a polyvinyl alcohol resin with a solid content of 15%, 5 parts of an aqueous amino resin Wanhua MH-85H, 10 parts of ethanol, and 1 part of a neutral silica sol with a particle size of 10 nm and a solid content of 30% were added sequentially to 66 parts of water and stirred uniformly to obtain a modified solution;

[0041] 2) Weighing the gangue ceramsite and the modifying liquid in a solid-liquid ratio of 50:6, spraying the modifying liquid onto the surface of the ceramsite, and mixing for 40 minutes using a mixer until the modifying liquid fully wets and coats the surface of the ceramsite;

[0042] 3) The modified ceramsite is dried at 200 degrees Celsius for 5 minutes and then sintered at 500 degrees Celsius for 10 minutes. During the sintering process, the organic components in the external modified coating are burned away at high temperature to form an inorganic nanoporous structure self-cleaning coating, which has the ability to photocatalytically degrade nitrate nitrogen and highly efficient nitrogen and phosphorus adsorption ceramsite.

[0043] The gangue ceramsite obtained by the modification method described in this embodiment has a 40% increase in the adsorption saturation concentration of ammonia nitrogen and a 35% increase in the adsorption saturation concentration of phosphorus compared to the unmodified slag ceramsite; at the same time, the surface of the modified ceramsite exhibits long-lasting super-hydrophilicity and photocatalytic ability, so that after one year of use in a wetland water environment, it can still catalytically reduce nitrate nitrogen in water. Under the condition of one hour of irradiation with a xenon lamp of standard solar intensity, the photocatalytic reduction capacity of a 50 mg / L ammonia nitrogen aqueous solution still retains 65% compared to the initial stage of administration.

[0044] Example 4

[0045] A method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption degradation material comprises the following steps:

[0046] 1) 30 parts of an aqueous dispersion of nano-titanium dioxide with a particle size of 10 nm and a solid content of 30%, 2 parts of an aqueous solution of a polyvinyl alcohol resin with a solid content of 15%, 10 parts of an aqueous amino resin Wanhua MH-85H, 10 parts of isopropyl alcohol, and 10 parts of a neutral silica sol with a particle size of 20 nm and a solid content of 25% were added sequentially to 58 parts of water and stirred uniformly to obtain a modified solution;

[0047] 2) Weigh the powdered shale ceramsite and the modifying liquid in a solid-liquid ratio of 50:3, spray the modifying liquid onto the surface of the ceramsite by ultrasonic spraying, and mix them in a mixer for 50 minutes until the modifying liquid fully wets and coats the surface of the ceramsite;

[0048] 3) The modified ceramsite is dried at 200 degrees Celsius for 10 minutes and then sintered at 600 degrees Celsius for 8 minutes. During the sintering process, the organic components of the surface modified coating are burned away at high temperature to form a self-cleaning coating with an inorganic nanoporous structure, which has the ability to photocatalytically degrade nitrate nitrogen and efficiently adsorb nitrogen and phosphorus.

[0049] The shale ceramsite obtained by the modification method described in this embodiment has a 40% higher adsorption saturation concentration of ammonia nitrogen in water and a 35% higher adsorption saturation concentration of phosphorus than the unmodified ceramsite; at the same time, the surface of the modified ceramsite exhibits long-lasting super-hydrophilicity and photocatalytic ability. After one year of use in a wetland water environment, it can still catalytically reduce nitrate nitrogen in water under sunlight conditions. Under the irradiation conditions of a xenon lamp with standard sunlight, it can still catalytically reduce nitrate nitrogen in water. Under the irradiation conditions of a xenon lamp with standard sunlight intensity for one hour, the photocatalytic reduction capacity of an aqueous solution of 50 mg / L of ammonia nitrogen is still retained by 68% compared with the initial stage of use.

[0050] Example 5

[0051] A method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption degradation material comprises the following steps:

[0052] 1) 27 parts of an aqueous dispersion of nano-titanium dioxide with a particle size of 20 nm and a solid content of 30%, 3 parts of an aqueous solution of polyvinyl alcohol resin with a solid content of 15%, 10 parts of ethylene glycol monobutyl ether, 10 parts of a neutral silica sol with a particle size of 10 nm and a solid content of 30%, and 8 parts of an aqueous amino resin Wanhua MH-85H were added sequentially to 41 parts of water and stirred to obtain a modified solution.

[0053] 2) Weighing zeolite ceramsite and modifying liquid at a solid-liquid ratio of zeolite ceramsite: modifying liquid = 50:1, spraying the modifying liquid onto the surface of the zeolite ceramsite, and spraying the modified liquid onto the surface of the ceramsite using ultrasonic spraying, while mixing in a mixer for 60 minutes until the modifying liquid fully wets and coats the surface of the ceramsite;

[0054] 3) The modified ceramsite is dried at 250 degrees Celsius for 5 minutes and then sintered at 850 degrees Celsius for 3 minutes. During the sintering process, the organic components in the external modified coating are burned away to form an inorganic porous structure self-cleaning coating, which has the ability to photocatalytically degrade nitrate nitrogen and highly efficient nitrogen and phosphorus adsorption ceramsite.

[0055] The zeolite ceramsite obtained by the modification method described in this embodiment has a 35% higher saturated adsorption capacity of ammonia nitrogen in water and a 40% higher saturated adsorption capacity of phosphorus than the unmodified zeolite ceramsite; at the same time, the surface of the modified ceramsite exhibits long-lasting super-hydrophilicity and photocatalytic ability. After one year of use in a wetland water environment, it can still catalytically reduce nitrate nitrogen in water. Under the irradiation conditions of a xenon lamp with standard sunlight, it can still catalytically reduce nitrate nitrogen in water. Under the irradiation conditions of a xenon lamp with standard sunlight intensity for one hour, the photocatalytic reduction capacity of an aqueous solution of 50 mg / L of ammonia nitrogen is still retained by 65% compared with the initial stage of use.

[0056] Example 6

[0057] This embodiment is Comparative Example 1, and its details are as follows:

[0058] Add 50 parts of diatomite ceramsite to 100 parts of nano-titanium dioxide aqueous dispersion with a particle size of 20 nm and a solid content of 30%, stir thoroughly, and soak for 24 hours;

[0059] The obtained ceramsite is subjected to solid-liquid separation, and the total amount of the remaining titanium dioxide dispersion is about 70% of that before soaking and modification. The ceramsite is then dried at 200 degrees Celsius for 20 minutes;

[0060] The obtained ceramsite was sintered at 950 degrees Celsius for 2 hours to obtain titanium dioxide loaded modified ceramsite.

[0061] Compared with unmodified ceramsite, the adsorption saturation concentration of ammonia nitrogen in water of the modified ceramsite is increased by 60%, and the adsorption saturation concentration of phosphorus is increased by 50%; however, during the production process, compared with Example 1), for the same 50 parts of diatomaceous earth, the nano-titanium dioxide solution used in Example 1 is only 3 parts, while in Example 6, the amount of nano-titanium dioxide solution used is 30 parts, and the amount of titanium dioxide used is increased by 9 times; in addition, after being used in a wetland water environment for 2 months, the ceramsite basically loses the ability to catalytically reduce nitrate nitrogen in water under sunlight conditions. Under the conditions of one hour of irradiation with a xenon lamp of standard sunlight intensity, the ability to photocatalytically reduce 50 mg / L of ammonia nitrogen aqueous solution is only retained by 5% compared with the initial stage of administration.

[0062] Example 7

[0063] This embodiment is Comparative Example 2, which is as follows:

[0064] 1) 30 parts of an aqueous dispersion of nano-titanium dioxide with a particle size of 20 nm and a solid content of 30%, 5 parts of an aqueous solution of polyvinyl alcohol resin with a solid content of 15%, 10 parts of ethylene glycol monobutyl ether, and 10 parts of a neutral silica sol with a particle size of 5 nm and a solid content of 30% were added to 55 parts of water in sequence and stirred to obtain a modified solution;

[0065] 2) Weigh diatomaceous earth and modifying liquid at a solid-liquid ratio of diatomaceous earth: modifying liquid = 50:10, then spray the modifying liquid onto the surface of the diatomaceous earth ceramsite, and mix it in a mixer for 20 minutes until the modifying liquid fully wets and coats the surface of the ceramsite;

[0066] 3) The modified ceramsite is dried at 150 degrees Celsius for 20 minutes and then sintered at 850 degrees Celsius for 3 minutes. During the sintering process, the organic components of the external modified coating are burned away at high temperature to form an inorganic nanoporous structure self-cleaning coating, which has the ability to photocatalytically degrade nitrate nitrogen and highly efficient nitrogen and phosphorus adsorption ceramsite.

[0067] The diatomite obtained by the modification method described in this embodiment has a saturated adsorption capacity of ammonia nitrogen in water increased by 45% and a saturated adsorption capacity of phosphorus increased by 50% compared with the unmodified diatomite. However, due to the lack of the use of water-based amino resin, the nano-titanium dioxide in the coating layer has insufficient photodegradation ability and cannot effectively decompose the pollutants adsorbed on the surface of the ceramsite. Therefore, the surface of the modified ceramsite only exhibits long-term super-hydrophilicity and photocatalytic ability in the initial stage. After one year of use in a wetland water environment, the ceramsite basically loses its ability to catalytically reduce nitrate nitrogen in water under sunlight conditions. Under the condition of one hour of irradiation with a xenon lamp of standard sunlight intensity, the ability to photocatalytically reduce a 50 mg / L ammonia nitrogen aqueous solution is only 8% compared to the initial stage of use.

Claims

1. A method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material, characterized in that: The following steps are involved: S1. Weigh ceramsite and super-hydrophilic coating modifying liquid in a solid-liquid ratio of ceramsite: super-hydrophilic coating modifying liquid = 50:10-1; S2, spraying the super-hydrophilic coating modification liquid onto the surface of the mixed ceramsite by ultrasonic atomization spraying, and continuously stirring and mixing for 20 to 60 minutes until the modification liquid fully wets and coats the surface of the ceramsite; S3. The ceramsite with the modified liquid coated on its surface is dried at 150-200° C. for 5-10 min, and then sintered at 450-950° C. for 20-25 min to form a dense self-cleaning coating with a nano-porous structure on the surface of the ceramsite, thereby obtaining modified ceramsite with both long-term photocatalytic degradation of nitrate nitrogen and efficient nitrogen and phosphorus adsorption.

2. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 1, characterized in that: The ceramsite is one or more of diatomite, zeolite, fly ash, shale ceramsite and coal gangue ceramsite.

3. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 1, characterized in that: The super-hydrophilic coating modification liquid is prepared by mixing 100 parts by mass of 10 to 30 parts of nano-titanium dioxide aqueous dispersion, 2 to 5 parts of polyvinyl alcohol resin aqueous solution, 5 to 10 parts of organic solvent, 1 to 10 parts of neutral nano-silica sol, 3 to 10 parts of water-soluble amino resin, and 40 to 66 parts of water.

4. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 3, characterized in that: The nano titanium dioxide aqueous dispersion has a solid content of 30% and a particle size of 5 to 20 nm.

5. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 3, characterized in that: The solid content of the polyvinyl alcohol resin aqueous solution is 5-15%.

6. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 3, characterized in that: The solid content of the nano neutral silica sol is 10-30% and the particle size is 5-20nm.

7. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 3, characterized in that: The water-soluble amino silicone oligomer has a polymerization degree of 5 to 200.

8. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 3, characterized in that: The water-soluble amino resin is Wongkaier W-180 or Wanhua MH-85H.

9. The method for preparing a surface hydrophilic and anti-fouling nitrogen and phosphorus adsorption material according to claim 1, characterized in that: The organic solvent is any one or more of ethylene glycol monobutyl ether, ethylene glycol monomethyl ether, ethanol and isopropanol.

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