Water purifying agent and preparation method thereof

Abstract

The invention relates to the technical field of water purification, in particular to a water purifying agent and a preparation method thereof.The water purifying agent is prepared from, by weight, 50-60 parts of modified zeolite powder, 20-30 parts of activated carbon, 8-10 parts of alum, 3-5 parts of quartz sand and 0.1-0.5 part of potassium hydrogen persulfate. The modified zeolite powder is subjected to acid pickling reaming and surface functional modification, and a multistage pore channel and active site synergistic effect system is constructed. Inherent micropore channels of zeolite are dredged through acid pickling, and the ion exchange capacity is improved. Strong chelating groups are introduced through grafting of the phosphonic acid-based copolymer, so that obligate capture of heavy metal ions is realized. Amino groups are protonized to form a positive potential interface, so that anion pollutants such as phosphate are effectively adsorbed. And through a synergistic mechanism of physical adsorption, chemical chelation and electrostatic interaction, the removal spectrum of pollutants is obviously expanded.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to a water purification agent and its preparation method. Background Technology

[0002] Modern water pollution presents a complex situation of multiple sources and overlapping pollution. Persistent organic pollutants (POPs) in industrial wastewater are co-emitted with heavy metals; nitrogen and phosphorus nutrients from agricultural non-point source pollution migrate synergistically with pesticides; and urban runoff contains the cumulative effects of emerging pollutants such as microplastics and antibiotics, collectively forming a complex pollution system. This complex pollution, through food chain transmission and biomagnification, produces synergistic toxic effects on aquatic ecosystems, significantly increasing the difficulty of environmental risk assessment and remediation. Simultaneously, the interaction mechanisms between pollutants are becoming increasingly complex. Heavy metal ions can enhance the environmental persistence of organic pollutants through complexation, while eutrophication-induced algal blooms alter the redox potential of water bodies, affecting pollutant speciation. For example, microcystins produced by cyanobacterial blooms, when coexisting with the heavy metal cadmium, significantly enhance the genotoxicity of aquatic organisms. Furthermore, acidic substances and heavy metals carried by atmospheric deposition enter water bodies through dry and wet deposition; groundwater pollution affects surface water quality through rock infiltration; and pollutants undergo transformation during river transport, collectively constituting a three-dimensional pollution pattern. Therefore, treatment technologies must be environmentally adaptable. For example, water purification agents must maintain stable efficacy in different scenarios such as deep water layers and flowing water bodies in order to achieve pollution control throughout the entire watershed.

[0003] In existing technologies, most purifying agents (such as flocculants and adsorbents) experience a sharp decline in effectiveness in deep water layers and flowing water bodies due to hydraulic disturbances or mismatched settling velocities, making it difficult to achieve simultaneous purification across the entire water layer. Changes in pH, temperature, and salinity (such as dilution during the rainy season or the mixing of fresh and brackish water) can easily lead to the deactivation or decomposition of the agents. Furthermore, traditional agents such as aluminum salt flocculants mainly target suspended solids or phosphorus, with low removal rates for dissolved organic pollutants. Activated carbon can adsorb organic matter, but its ability to capture heavy metal ions is weak. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a water purification agent and its preparation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A water purification agent comprises the following raw materials by weight: 50-60 parts modified zeolite powder, 20-30 parts activated carbon, 8-10 parts alum, 3-5 parts quartz sand, and 0.1-0.5 parts potassium persulfate.

[0006] Preferably, the raw materials include the following by weight: 52-58 parts modified zeolite powder, 24-39 parts activated carbon, 8-9 parts alum, 4 parts quartz sand and 0.2 parts potassium persulfate.

[0007] Furthermore, the modified zeolite powder includes the following steps: S1. Add zeolite to hydrochloric acid, stir for 4-6 hours, wash until neutral, dry at 110℃ for 2-4 hours to obtain acid-washed zeolite. Immerse the acid-washed zeolite in a mixture of anhydrous ethanol and 3-aminopropyltriethoxysilane, reflux for 12-14 hours. After the reaction is complete, filter, wash 3 times with ethanol, and vacuum dry at 60℃ to constant weight to obtain aminated zeolite. S2. Under nitrogen protection, N-vinylformamide and vinylphosphonic acid were added to deionized water, ammonium persulfate was added, the pH value was adjusted, and the reaction was stirred at a constant temperature for 6-8 hours. After the reaction was completed, the reaction solution was poured into 3 times the volume of acetone to precipitate, filtered, and vacuum dried at 40°C to constant weight to obtain the copolymer. S3. Add the copolymer to MES buffer, add EDC hydrochloride and N-hydroxysuccinimide, stir at room temperature for 30-40 min, add aminated zeolite, shake and react for 24-36 h. After the reaction is complete, filter, wash 3 times with saturated NaCl solution, dry under vacuum at 60 °C to constant weight, immerse the product in glutaraldehyde aqueous solution for crosslinking treatment for 2-4 h, wash with deionized water until neutral, dry under vacuum at 60 °C to constant weight, pulverize and pass through an 80-120 mesh sieve to obtain modified zeolite powder.

[0008] Furthermore, in step S1, the concentration of hydrochloric acid is 1-1.5 mol / L, the temperature during acid washing is 70-80℃, the stirring speed is 100-200 rpm, and the temperature during reflux is 70-80℃.

[0009] Further, in step S1, the mass ratio of zeolite, hydrochloric acid, anhydrous ethanol and 3-aminopropyltriethoxysilane is (100-105):(36-38):(157-160):(18-19).

[0010] Furthermore, in step S2, the pH value is adjusted to 5.0-6.0, the constant temperature reaction temperature is 70-75℃, and the stirring speed is 200-300 rpm.

[0011] Further, in step S2, the mass ratio of N-vinylformamide, vinylphosphonic acid, deionized water and ammonium persulfate is (42-45):(54-56):(200-220):(1-1.5).

[0012] Further, in step S3, the mass ratio of copolymer, MES buffer, EDC hydrochloride, N-hydroxysuccinimide and amino zeolite is (20-28):(100-110):(1.8-2):(1-1.3):(30-35), and the pH of the MES buffer is 5.0-6.0.

[0013] Furthermore, in step S3, the temperature during the oscillation reaction is 35-45℃, the speed is 600-700rpm, the mass concentration of the glutaraldehyde aqueous solution is 3-8%, the pH value during the crosslinking treatment is 7.5-8.5, and the temperature is 45-55℃.

[0014] According to another aspect of the present invention, a method for preparing the above-mentioned water purification agent is provided, comprising the following steps: Weigh the modified zeolite powder, activated carbon, alum, and quartz sand according to the specified weight proportions and add them to the mixer. Mix at 200-300 rpm for 20-30 minutes until the material has a uniform color. Continue to add potassium persulfate, reduce the speed to 100-150 rpm, and continue mixing for 5-10 minutes. Pass the mixture through an 80-120 mesh vibrating screen to remove lumps and obtain the water purification agent.

[0015] The beneficial effects of this invention are: 1. In the technical solution of this invention, modified zeolite powder, through acid washing to expand pores and surface functionalization, constructs a multi-level pore and active site synergistic system. Acid washing unblocks the inherent microporous channels of zeolite, improving ion exchange capacity. Phosphonic acid-based copolymers are grafted to introduce strong chelating groups, achieving specific capture of heavy metal ions. Amination protonation forms a positive potential interface, effectively adsorbing anionic pollutants such as phosphates. Through the synergistic mechanism of physical adsorption, chemical chelation, and electrostatic interaction, the removal spectrum of pollutants is significantly expanded.

[0016] 2. In the technical solution of this invention, surface functional groups and residual metal elements constitute catalytic active centers, which can activate potassium persulfate to continuously generate free radicals. Zeolite micropores, acting as nanoreactors, enhance the concentration and lifetime of free radicals through spatial confinement, gradually oxidizing and degrading organic pollutants into small molecule products, which are then adsorbed secondary through multi-level channels. This adsorption-oxidation cycle system effectively avoids the performance degradation caused by adsorption saturation in traditional materials.

[0017] 3. In the technical solution of this invention, the phosphonic acid copolymer is covalently anchored to the zeolite substrate via amide bonds, and the glutaraldehyde crosslinking further forms a three-dimensional network structure, significantly enhancing the interfacial bonding force and anti-swelling ability. This enables it to resist water flow shear and acid-base fluctuations, inhibit the enzymatic erosion of functional groups by microorganisms, and ensure long-term operational stability. Simultaneously, the high-density positive charge and hydrophobic properties on the surface synergistically inhibit biofilm formation, reducing the risk of clogging at the source. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Preparation Example 1 Modified zeolite powder includes the following steps: S1. Add 100g of zeolite to 36g of 1mol / L hydrochloric acid, stir at 100rpm for 4h at 70℃, wash until neutral, and dry at 110℃ for 2h to obtain acid-washed zeolite. Immerse the acid-washed zeolite in a mixture of 157g of anhydrous ethanol and 18g of 3-aminopropyltriethoxysilane, reflux at 70℃ for 12h. After the reaction is complete, filter, wash 3 times with ethanol, and vacuum dry at 60℃ to constant weight to obtain aminated zeolite. S2. Under nitrogen protection, 42g of N-vinylformamide and 54g of vinylphosphonic acid were added to 200g of deionized water, and 1g of ammonium persulfate was added to adjust the pH to 5.0. The mixture was stirred at 70℃ for 6 hours at a stirring speed of 200rpm. After the reaction was completed, the reaction solution was poured into 3 times its volume of acetone to precipitate, filtered, and dried under vacuum at 40℃ to constant weight to obtain the copolymer. S3. Add 20g of copolymer to 100g of MES buffer solution with pH 5.0, add 1.8g of EDC hydrochloride and 1g of N-hydroxysuccinimide, stir at room temperature for 30min, add 30g of aminated zeolite, and shake at 35℃ for 24h at a speed of 600rpm. After the reaction is complete, filter, wash three times with saturated NaCl solution, and vacuum dry at 60℃ to constant weight. Immerse the product in a 3% glutaraldehyde aqueous solution for crosslinking treatment for 2h at pH 7.5 and temperature 45℃. Wash with deionized water until neutral, vacuum dry at 60℃ to constant weight, and pulverize through an 80-mesh sieve to obtain modified zeolite powder.

[0020] Preparation Example 2 Modified zeolite powder includes the following steps: S1. Add 102.1g of zeolite to 37.4g of 1-1.5mol / L hydrochloric acid, stir at 150rpm for 5h at 75℃, wash until neutral, and dry at 110℃ for 3h to obtain acid-washed zeolite. Immerse the acid-washed zeolite in a mixture of 158.9g of anhydrous ethanol and 18.5g of 3-aminopropyltriethoxysilane, reflux at 75℃ for 13h. After the reaction is complete, filter, wash three times with ethanol, and vacuum dry at 60℃ to constant weight to obtain aminated zeolite. S2. Under nitrogen protection, 43.8g of N-vinylformamide and 55.4g of vinylphosphonic acid were added to 210g of deionized water, and 1.2g of ammonium persulfate was added to adjust the pH to 5.5. The mixture was stirred at 72℃ for 7h at a stirring speed of 250rpm. After the reaction was completed, the reaction solution was poured into 3 times its volume of acetone to precipitate the product. The product was then filtered and dried under vacuum at 40℃ to constant weight to obtain the copolymer. S3. Add 25g of copolymer to 105g of MES buffer solution with pH 5.5, add 1.9g of EDC hydrochloride and 1.1g of N-hydroxysuccinimide, stir at room temperature for 35min, add 32.6g of aminated zeolite, and shake at 40℃ for 30h at a speed of 650rpm. After the reaction is complete, filter, wash three times with saturated NaCl solution, and vacuum dry at 60℃ to constant weight. Immerse the product in a 6% glutaraldehyde aqueous solution for crosslinking treatment for 3h at pH 8.0 and temperature 50℃. Wash with deionized water until neutral, vacuum dry at 60℃ to constant weight, and pulverize through a 100-mesh sieve to obtain modified zeolite powder.

[0021] Preparation Example 3 Modified zeolite powder includes the following steps: S1. Add 105g of zeolite to 38g of 1.5mol / L hydrochloric acid, stir at 200rpm for 6h at 80℃, wash until neutral, dry at 110℃ for 4h to obtain acid-washed zeolite, immerse the acid-washed zeolite in a mixture of 160g of anhydrous ethanol and 19g of 3-aminopropyltriethoxysilane, reflux at 80℃ for 14h, after the reaction is complete, filter, wash 3 times with ethanol, and vacuum dry at 60℃ to constant weight to obtain aminated zeolite; S2. Under nitrogen protection, 45g of N-vinylformamide and 56g of vinylphosphonic acid were added to 220g of deionized water, and 1.5g of ammonium persulfate was added to adjust the pH to 6.0. The mixture was stirred at 75℃ for 8 hours at a stirring speed of 300rpm. After the reaction was completed, the reaction solution was poured into 3 times its volume of acetone to precipitate, filtered, and dried under vacuum at 40℃ to constant weight to obtain the copolymer. S3. Add 28g of copolymer to 110g of MES buffer solution with pH 6.0, add 2g of EDC hydrochloride and 1.3g of N-hydroxysuccinimide, stir at room temperature for 40min, add 35g of aminated zeolite, and shake at 45℃ for 36h at a speed of 700rpm. After the reaction is complete, filter, wash three times with saturated NaCl solution, and vacuum dry at 60℃ to constant weight. Immerse the product in an 8% glutaraldehyde aqueous solution for crosslinking treatment for 4h at pH 8.5 and temperature 55℃. Wash with deionized water until neutral, vacuum dry at 60℃ to constant weight, and pulverize through a 120-mesh sieve to obtain modified zeolite powder.

[0022] Example 1 A method for preparing a water purification agent includes the following steps: Weigh out 50 parts by weight of the modified zeolite powder, 20 parts by weight of activated carbon, 8 parts by weight of alum and 3 parts by weight of quartz sand and put them into a mixer. Mix at 200 rpm for 20 minutes until the material is uniform in color. Then add 0.1 parts by weight of potassium persulfate, reduce the speed to 100 rpm and continue mixing for 5 minutes. Pass the mixture through an 80-mesh vibrating screen to remove lumps and obtain a water purification agent.

[0023] Example 2 A method for preparing a water purification agent includes the following steps: Weigh out 56 parts by weight of the modified zeolite powder, 23 parts by weight of activated carbon, 9 parts by weight of alum and 4 parts by weight of quartz sand and add them to a mixer. Mix at 250 rpm for 25 minutes until the material is uniform in color. Then add 0.3 parts by weight of potassium persulfate, reduce the speed to 100 rpm and continue mixing for 8 minutes. Pass the mixture through a 100-mesh vibrating screen to remove lumps and obtain the water purification agent.

[0024] Example 3 A method for preparing a water purification agent includes the following steps: Weigh 60 parts by weight of the modified zeolite powder, 30 parts by weight of activated carbon, 10 parts by weight of alum and 5 parts by weight of quartz sand, and add them to a mixer. Mix at 300 rpm for 30 minutes until the material is uniform in color. Then add 0.5 parts by weight of potassium persulfate, reduce the speed to 150 rpm, and continue mixing for 10 minutes. Pass the mixture through a 120-mesh vibrating screen to remove lumps and obtain the water purification agent.

[0025] Comparative Example 1 The difference between this comparative example and Example 1 is that the aminated zeolite obtained in step S1 of Preparation Example 1 is used instead of the modified zeolite powder, while the remaining steps are the same as in Example 1.

[0026] Comparative Example 2 The difference between this comparative example and Example 2 is that commercially available zeolite powder is used instead of modified zeolite powder, while the remaining steps are the same as in Example 2.

[0027] Comparative Example 3 The difference between this comparative example and Example 3 is that commercially available zeolite powder is used instead of modified zeolite powder, while the remaining steps are the same as in Example 3.

[0028] The simulated wastewater working solution is prepared by the following steps: Weigh 1.599g Pb(NO3)2 and dissolve it in 1L of 1% HNO3 solution, and take 5mL for later use; weigh 1.142g Cd(NO3)2·4H2O and dissolve it in 1L of 1% HNO3 solution, and take 2.5mL for later use; weigh 0.500g methylene blue and sonicate it to dissolve in PBS buffer with a pH of 7.0 and bring the volume to 1L, and take 50mL for later use; weigh 0.500g phenol and sonicate it to dissolve in PBS buffer with a pH of 7.0 and bring the volume to 1L, and take 30mL for later use; weigh 0.358g KH2PO4 and sonicate it to dissolve in PBS buffer and bring the volume to 1L, and take 20mL for later use; weigh 5.0g kaolin and sonicate it for 30min and then sonicate it to dissolve in PBS buffer and bring the volume to 1L, and take 10mL for later use. Collect all the mother liquor, add PBS buffer with pH 7.0 to a total volume of 450 mL, stir magnetically at 100 rpm for 15 min, adjust the pH to 7.0 ± 0.1 with 0.1 mol / L NaOH or HNO3, and bring the volume to 500 mL with PBS buffer to obtain the simulated wastewater working solution. Pour the solution into conical flasks for batching and use.

[0029] Take 0.5g of the purifying agent prepared in Examples 1-3 and Comparative Examples 1-3 and add it to each simulated sewage conical flask. Place the flask in a constant temperature shaker and shake at 25°C and 150rpm. Take 10mL of sample at 2cm below the liquid surface at time point t=120min.

[0030] (I) Turbidity: The untreated sample was directly measured. The removal rate = (blank turbidity - sample turbidity) / blank turbidity × 100%.

[0031] (II) Heavy metals: The sample was filtered through a 0.45 μm filter membrane, and the filtrate was diluted with 1% HNO3 to the linear range. Using AAS, the wavelength for Pb detection was 283.3 nm, the lamp current was 10 mA, the slit width was 0.7 nm, and the detection limit was 0.01 mg / L; the wavelength for Cd detection was 228.8 nm, the lamp current was 8 mA, the slit width was 0.5 nm, and the detection limit was 0.005 mg / L.

[0032] (III) Phosphate: Prepare molybdenum antimony reagent according to GB / T11893-1989 "Determination of total phosphorus in water by ammonium molybdate spectrophotometric method". Take 2 mL of filtrate and 1 mL of molybdenum antimony reagent, develop color in the dark for 15 min, and measure absorbance at 700 nm.

[0033] (IV) Methylene blue: Continue to centrifuge the sample at 10,000 rpm for 5 min, take the supernatant, and measure the absorbance at 664 nm.

[0034] (V) Phenol: Measure the absorbance of the supernatant at 270 nm after centrifugation.

[0035] Calculate the adsorption amount q t The formula is as follows:

[0036] Where C0 is the initial concentration (mg / L), C t The concentration at time t (mg / L) is given. The results are shown in Table 1. Table 1. Adsorption capacity and turbidity removal rate of each purifying agent at 120 min:

[0037] As can be seen from the data in Table 1, the water purification agents prepared in Examples 1-3 have a significant effect on Pb. 2+ Cd 2+ PO4 3- The adsorption capacity of the examples of methylene blue and phenol, as well as the turbidity removal rate, were significantly higher than those of Comparative Examples 1-3. Examples 1-3 used modified zeolite powder, while Comparative Example 1 used the aminated zeolite obtained in step S1 of Preparation Example 1. The examples showed significantly better adsorption performance than Comparative Example 1, indicating that further reaction between the copolymer and the aminated zeolite, as well as the crosslinking treatment of glutaraldehyde, played a crucial role in improving the purification effect.

[0038] In step S2 of preparing modified zeolite powder, N-vinylformamide and vinylphosphonic acid copolymerize under ammonium persulfate initiation to form a copolymer. This copolymer contains various functional groups, such as formamide groups and phosphonic acid groups, which can bind with heavy metal ions and phosphates in water through electrostatic interactions and complexation, thereby enhancing the adsorption capacity for pollutants. In step S3, after the copolymer reacts with aminated zeolite, it undergoes glutaraldehyde crosslinking treatment. Glutaraldehyde can react with amino groups on the copolymer and aminated zeolite to form a more stable three-dimensional network structure. This not only increases the specific surface area of ​​the purifier and provides more adsorption sites, but also makes the adsorbed pollutants more firmly fixed on the surface of the purifier, reducing desorption and thus improving the adsorption capacity and turbidity removal rate of various pollutants.

[0039] Examples 1-3 used self-made modified zeolite powder, while Comparative Examples 2 and 3 used commercially available zeolite powder. The purification effect of the examples was far superior to that of Comparative Examples 2 and 3, indicating that the self-made modified zeolite powder, after a series of special chemical treatments, was endowed with superior adsorption performance. In step S1 of preparing the modified zeolite powder, the zeolite was first acid-washed with hydrochloric acid. Acid washing can remove impurities on the surface of the zeolite and blockages in the pores, clear the pores, increase the specific surface area and pore volume of the zeolite, and expose more active sites, which is beneficial for subsequent adsorption of pollutants. The acid-washed zeolite reacted with 3-aminopropyltriethoxysilane for amination. Amino groups are basic groups that can electrostatically attract acidic pollutants in water; at the same time, amino groups can also act as bonding points, further reacting with copolymers to introduce more adsorption-functional groups. As mentioned above, the modification of the copolymer and the crosslinking treatment of glutaraldehyde further enhanced the adsorption capacity of the purifier for various pollutants. Commercially available zeolite powder has not undergone these special chemical modification treatments. Its surface properties and pore structure are relatively simple, and its adsorption of pollutants mainly relies on its own physical adsorption. Therefore, its adsorption capacity and purification effect are far inferior to those of self-made modified zeolite powder.

[0040] In summary, through a series of modification steps such as acid washing, amination, copolymer modification, and crosslinking treatment, the adsorption capacity of zeolite powder for various pollutants (heavy metal ions, phosphates, organic dyes, phenols, etc.) in water and the turbidity removal rate were significantly improved, resulting in the water purification agent prepared in the examples having superior purification performance.

[0041] In the description of this specification, the terms "preparation example," "example," "various examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that example or preparation example, which are included in at least one example or preparation example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same example or preparation example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more examples or preparation examples.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water purification agent, characterized in that, The raw materials include the following by weight: 50-60 parts modified zeolite powder, 20-30 parts activated carbon, 8-10 parts alum, 3-5 parts quartz sand and 0.1-0.5 parts potassium persulfate.

2. The water purification agent according to claim 1, characterized in that, Modified zeolite powder includes the following steps: S1. Add zeolite to hydrochloric acid, stir for 4-6 hours, wash until neutral, dry to obtain acid-washed zeolite, immerse the acid-washed zeolite in a mixture of anhydrous ethanol and 3-aminopropyltriethoxysilane, reflux for 12-14 hours, wash and dry to obtain aminated zeolite. S2. Under nitrogen protection, N-vinylformamide and vinylphosphonic acid were added to deionized water, ammonium persulfate was added, the pH value was adjusted, and the reaction was carried out at a constant temperature with stirring for 6-8 hours. After filtration and drying, the copolymer was obtained. S3. Add the copolymer to MES buffer, add EDC hydrochloride and N-hydroxysuccinimide, stir at room temperature for 30-40 min, add aminated zeolite, shake and react for 24-36 h, wash and dry, immerse the product in glutaraldehyde aqueous solution for crosslinking treatment for 2-4 h, wash with water until neutral, dry, pulverize through an 80-120 mesh sieve to obtain modified zeolite powder.

3. The water purification agent according to claim 2, characterized in that, In step S1, the concentration of hydrochloric acid is 1-1.5 mol / L, the temperature during acid washing is 70-80℃, the stirring speed is 100-200 rpm, and the temperature during reflux is 70-80℃.

4. The water purification agent according to claim 2, characterized in that, In step S1, the mass ratio of zeolite, hydrochloric acid, anhydrous ethanol and 3-aminopropyltriethoxysilane is (100-105): (36-38): (157-160): (18-19).

5. A water purification agent according to claim 2, characterized in that, In step S2, adjust the pH value to 5.0-6.0, maintain the constant temperature of the reaction at 70-75℃, and stir at 200-300 rpm.

6. The water purification agent according to claim 2, characterized in that, In step S2, the mass ratio of N-vinylformamide, vinylphosphonic acid, deionized water and ammonium persulfate is (42-45):(54-56):(200-220):(1-1.5).

7. The water purification agent according to claim 2, characterized in that, In step S3, the mass ratio of copolymer, MES buffer, EDC hydrochloride, N-hydroxysuccinimide and amino zeolite is (20-28):(100-110):(1.8-2):(1-1.3):(30-35), and the pH of the MES buffer is 5.0-6.

0.

8. A water purification agent according to claim 2, characterized in that, In step S3, the temperature during the oscillation reaction is 35-45℃, the speed is 600-700rpm, the mass concentration of the glutaraldehyde aqueous solution is 3-8%, the pH value during the crosslinking treatment is 7.5-8.5, and the temperature is 45-55℃.

9. A method for preparing a water purification agent as described in any one of claims 1-8, characterized in that, Includes the following steps: Weigh the modified zeolite powder, activated carbon, alum, and quartz sand according to the specified weight proportions and add them to the mixer. Mix at 200-300 rpm for 20-30 minutes. Continue to add potassium persulfate, reduce the speed to 100-150 rpm, and continue mixing for 5-10 minutes. Pass the mixture through an 80-120 mesh vibrating screen to obtain the water purification agent.

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