Efficient polyaluminum chloride water purifying agent

Abstract

The invention relates to the technical field of water treatment, in particular to an efficient polyaluminum chloride water purifying agent. The preparation method comprises the following steps: firstly, mixing polyaluminum chloride with high alkalization degree, a nanocrystal nucleus inducer, an organic chelating agent, La < 3 + > doped graphene oxide, an alkaline regulator, a heavy metal capturing agent, an auxiliary flocculating agent, ZnO-TiO2 coated SiO2 heterojunction nanoparticles and a modified graphene-based adsorption material according to a proportion by a dry method, and carrying out ball milling for 1 hour until the mixture is uniform, so as to obtain a component A; then mixing carbon black and active silica gel according to a ratio, drying at 150 DEG C for 2 hours, then adding boron gel and anionic polyacrylamide step by step: firstly dissolving PAM, then slowly adding the boron gel, and finally obtaining a component B; finally, the component A and the component B are mixed for 20 min under low-speed stirring, the efficient polyaluminum chloride water purifying agent can be obtained, and in this way, the technical problems that in the prior art, when a polyaluminum chloride water purifying agent is used for treating wastewater with complex water quality, the flocculation efficiency is low, the precipitation speed is low, and the treatment cost is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and particularly to a high-efficiency polyaluminum chloride water purifying agent. Background Art

[0002] With the acceleration of the industrialization and urbanization processes, the problem of water resource pollution has become increasingly severe, and water treatment has become a key link in ensuring the sustainable development of human health and the ecological environment. Water treatment not only involves the purification of drinking water, but also covers the treatment and reuse of industrial wastewater and domestic sewage, which is of great significance for alleviating water resource shortages and reducing water pollution. Among many water treatment technologies, the chemical flocculation method is widely used due to its high efficiency and economy. Among them, polyaluminum chloride (PAC), as an important inorganic polymer flocculant, shows broad application prospects in the water treatment field due to its good charge neutralization and bridging adsorption properties.

[0003] However, the existing polyaluminum chloride water purifying agents have low flocculation efficiency, slow sedimentation speed, and high treatment costs when treating wastewater with complex water quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-efficiency polyaluminum chloride water purifying agent, aiming to solve the technical problems of low flocculation efficiency, slow sedimentation speed, and high treatment costs of polyaluminum chloride water purifying agents in the prior art when treating wastewater with complex water quality.

[0005] To achieve the above purpose, a high-efficiency polyaluminum chloride water purifying agent adopted by the present invention includes 75 - 80 parts of component A and 20 - 25 parts of component B. The component A includes 50 - 60 parts of high-alkalinity polyaluminum chloride, 5 - 10 parts of nanocrystalline nucleus inducer, 3 - 8 parts of organic chelating agent, 0.5 - 1.5 parts of La 3+ doped graphene oxide, 2 - 4 parts of alkaline regulator, 1 part of heavy metal scavenger, 10 - 20 parts of modified graphene-based adsorbent material;

[0006] The component B includes 6 - 10 parts of carbon black, 9 - 12 parts of silica gel, and 3 - 5 parts of boron glue.

[0007] Among them, the alkalinity of the high-alkalinity polyaluminum chloride is 88 - 92%;

[0008] The specific preparation method of the high-alkalinity polyaluminum chloride is as follows:

[0009] Mix industrial-grade aluminum chloride and deionized water at a mass ratio of 1:3 - 5, stir and dissolve at 40 - 60 °C until clear to obtain an aluminum chloride solution;

[0010] Slowly drop the alkalizing agent into the aluminum chloride solution at a concentration of 0.5 - 1.0 mol / L, and react for 1 - 2 hours;

[0011] Continuously add the alkalizing agent until the pH of the system rises to 6.0 - 7.0, and react for 2 - 3 hours;

[0012] Transfer the reaction solution to a sealed container, and dynamically cure it at 80 - 90 °C for 4 - 6 hours. Meanwhile, introduce nitrogen for protection to prevent oxidation, so that the molecular chains of polyaluminum chloride are arranged directionally to form a stable structure with a high degree of alkalinity;

[0013] Quickly cool the product to room temperature, and obtain a solid powder with a degree of alkalinity of 88 - 92% through spray drying or vacuum drying.

[0014] Among them, the nanocrystalline nucleus inducer is a composite nanoparticle made of iron sulfide (FeS) and titanium dioxide (TiO2);

[0015] The particle size of the composite nanoparticle is 15 - 25 nm;

[0016] The molar ratio of iron sulfide (FeS) to titanium dioxide (TiO2): 1:0.8 - 1.2.

[0017] Among them, the preparation method of the modified graphene-based adsorbent is as follows:

[0018] Add 8 g of graphene oxide to 100 g of deionized water, stir and mix evenly to obtain a graphene oxide dispersion liquid. Under stirring conditions, ultrasonically treat it for 3 h, heat up to 60 °C, stop ultrasonic treatment, and then slowly dropwise add 10 mL of an aqueous solution containing 0.5 g of dicyandiamide formaldehyde condensate under continuous stirring conditions, and continue the heat preservation reaction for 5 h to obtain the modified graphene-based adsorbent.

[0019] Among them, the alkaline regulator is industrial waste alkali.

[0020] Among them, the component B also includes 1 - 2 parts of an auxiliary agent, and the auxiliary agent is an aqueous solution of anionic polyacrylamide with a concentration of 0.01 - 0.05% and a molecular weight greater than 8 million daltons.

[0021] Among them, the carbon black is in powder form, its specific surface area is 1500 - 2500 square meters per gram, and the silica gel is activated silica gel; its pore volume V (the total volume of pores inside each gram of silica gel) is 1.8 - 2.8 mL / g.

[0022] Among them, the component A also includes 5 - 8 parts of ZnO-TiO2 heterojunction nanoparticles with a particle size of 20 - 40 nm, and the surface of ZnO-TiO2 is coated with an SiO2 layer with a thickness of 2 - 5 nm.

[0023] Among them, the component A also includes 3 - 5 parts of an auxiliary flocculant, and the auxiliary flocculant is carboxymethyl chitosan.

[0024] Among them, the preparation method of the high-efficiency polyaluminum chloride water purifying agent is as follows:

[0025] Preparation of component A: Mix high-basicity polyaluminum chloride, nanocrystalline nucleus inducer, organic chelating agent, La 3+ doped graphene oxide, alkaline regulator, heavy metal scavenger, auxiliary flocculant, ZnO-TiO2@SiO2 heterojunction nanoparticles, and modified graphene-based adsorbent materials by dry mixing in proportion, and ball mill for 1 h until uniform to obtain component A;

[0026] Preparation of component B: Mix carbon black and activated silica gel in proportion, dry at 150 °C for 2 h, and then add boron glue and anionic polyacrylamide step by step: first dissolve PAM, and then slowly add boron glue to finally obtain component B;

[0027] Mixing of component A and component B: Mix component A and component B under low-speed stirring for 20 min to obtain the high-efficiency polyaluminum chloride water purifying agent.

[0028] For a high-efficiency polyaluminum chloride water purifying agent of the present invention, the present invention first dry mixes high-basicity polyaluminum chloride, nanocrystalline nucleus inducer, organic chelating agent, La 3+ doped graphene oxide, alkaline regulator, heavy metal scavenger, auxiliary flocculant, ZnO-TiO2@SiO2 heterojunction nanoparticles, and modified graphene-based adsorbent materials in proportion, and ball mill for 1 h until uniform to obtain component A; then mix carbon black and activated silica gel in proportion, dry at 150 °C for 2 h, and then add boron glue and anionic polyacrylamide step by step: first dissolve PAM, and then slowly add boron glue to finally obtain component B; finally, mix component A and component B under low-speed stirring for 20 min to obtain the high-efficiency polyaluminum chloride water purifying agent, thereby solving the technical problems of low flocculation efficiency, slow precipitation speed, and high treatment cost in the prior art when the polyaluminum chloride water purifying agent is used to treat wastewater with complex water quality.

[0029] The high-basicity polyaluminum chloride of the present invention compresses the colloidal double layer through strong electro-neutralization to quickly destroy the stability of pollutants;

[0030] The FeS-TiO2 nanocrystalline nucleus inducer and the ZnO-TiO2@SiO2 heterojunction photocatalytic material act synergistically. The former provides active sites for flocs to enhance adsorption, and the latter excites free radicals under ultraviolet light to degrade organic matter, reducing the pollutant load and making the flocculation process more efficient.

[0031] Carboxymethyl chitosan and organic chelating agent form a dual chelation mechanism to strengthen the capture ability of heavy metal ions (such as Pb 2+ , Cd 2+ ) and reduce the residual concentration.

[0032] Using industrial waste alkali as an alkaline regulator can reduce the raw material cost by 20%-30% and simultaneously reduce the emission of industrial solid waste.

[0033] By coating a 2-5nm SiO2 passivation layer on the surface of the ZnO-TiO2 heterojunction, while inhibiting the recombination of photo-generated carriers, it endows it with visible light response ability. ZnO-TiO2@SiO2 mainly adsorbs when the light is insufficient and initiates photocatalytic degradation when the light is sufficient, adapting to different environmental conditions and improving the energy utilization efficiency.

[0034] The auxiliary flocculant carboxymethyl chitosan forms multiple hydrogen bonds with the floc surface through amino and hydroxyl groups, significantly enhancing the shear resistance of the flocs. Using carbon black with a high specific surface area (1500-2500m 2 / g) and activated silica with a large pore volume (1.8-2.8 mL / g) to construct a gradient pore structure, through the synergistic effect of physical adsorption and ion exchange, deeply purify the residual micro-polluted organic matter and heavy metal ions in water.

[0035] La 3+ Doped graphene oxide can inhibit the proliferation of microorganisms such as Escherichia coli and cyanobacteria in water, reduce the formation of biofilms, and reduce the subsequent disinfection cost. After the A / B components are premixed, they can be directly added without complex activation steps, simplifying the on-site operation process and saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1 is the flow chart of the preparation method of the high-efficiency polyaluminum chloride water purifying agent of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0039] The first embodiment of the present application is:

[0040] Please refer to Figure 1 , Figure 1 is the flow chart of the preparation method of the high-efficiency polyaluminum chloride water purifying agent of the present invention.

[0041] The present invention provides an efficient polyaluminum chloride water purifying agent, which comprises 75-80 parts of component A and 20-25 parts of component B. Component A includes 50-60 parts of polyaluminum chloride with high basicity, 5-10 parts of nanocrystalline nucleus inducer, 3-8 parts of organic chelating agent, 0.5-1.5 parts of La 3+ doped graphene oxide, 2-4 parts of basic regulator, 1 part of heavy metal scavenger, 10-20 parts of modified graphene-based adsorbent material, 5-8 parts of ZnO-TiO2 heterojunction nanoparticles and 3-5 parts of auxiliary flocculant;

[0042] Component B includes 6-10 parts of carbon black, 9-12 parts of silica gel, 3-5 parts of boron glue and 1-2 parts of auxiliary agent.

[0043] The basicity of the polyaluminum chloride with high basicity is 88-92%;

[0044] The specific preparation method of the polyaluminum chloride with high basicity is as follows:

[0045] Mix industrial-grade aluminum chloride and deionized water in a mass ratio of 1:3-5, stir and dissolve at 40-60 °C until clear to obtain an aluminum chloride solution;

[0046] Slowly drop the basifying agent into the aluminum chloride solution at a concentration of 0.5-1.0 mol / L, and react for 1-2 hours;

[0047] Continue to drop the basifying agent until the pH of the system rises to 6.0-7.0, and react for 2-3 hours;

[0048] Transfer the reaction solution to a closed container, dynamically age at 80-90 °C for 4-6 hours, and introduce nitrogen for protection to prevent oxidation, so that the molecular chain of polyaluminum chloride is arranged in an orderly manner to form a stable high-basicity structure;

[0049] Quickly cool the product to room temperature, and obtain a solid powder with a basicity of 88-92% by spray drying or vacuum drying.

[0050] The nanocrystalline nucleus inducer is a composite nanoparticle made of iron sulfide (FeS) and titanium dioxide (TiO2);

[0051] The particle size of the composite nanoparticle is 15-25 nm;

[0052] The molar ratio of iron sulfide (FeS) to titanium dioxide (TiO2): 1:0.8-1.2.

[0053] The preparation method of the modified graphene-based adsorbent material is as follows:

[0054] 8 g of graphene oxide was added to 100 g of deionized water. After stirring and mixing evenly, a graphene oxide dispersion was obtained. Under stirring conditions, it was ultrasonically treated for 3 h, heated to 60 °C, and the ultrasonic treatment was stopped. Then, under continuous stirring conditions, 10 mL of an aqueous solution containing 0.5 g of dicyandiamide-formaldehyde condensate was slowly added dropwise, and the reaction was continued under heat preservation for 5 h to obtain a modified graphene-based adsorbent material.

[0055] The basic regulator is industrial waste alkali.

[0056] The auxiliary agent is an aqueous solution of anionic polyacrylamide with a concentration of 0.01 - 0.05% and a molecular weight greater than 8 million Daltons.

[0057] The carbon black is in powder form, with a specific surface area of 1500 - 2500 square meters per gram. The silica gel is activated silica gel; its pore volume V (the total volume of the internal pores of each gram of silica gel) is 1.8 - 2.8 mL / g.

[0058] The auxiliary flocculant is carboxymethyl chitosan.

[0059] In the present invention, first, high-basicity polyaluminum chloride, nanocrystalline nucleus inducer, organic chelating agent, La 3+ -doped graphene oxide, basic regulator, heavy metal scavenger, auxiliary flocculant, ZnO-TiO2@SiO2 heterojunction nanoparticles, and modified graphene-based adsorbent material were dry-mixed in proportion and ball-milled for 1 h until uniform to obtain component A; then, carbon black and activated silica gel were mixed in proportion, dried at 150 °C for 2 h, and subsequently, boron glue and anionic polyacrylamide were added step by step: first, PAM was dissolved, and then boron glue was slowly added, and finally component B was obtained; finally, component A and component B were mixed under low-speed stirring for 20 min to obtain a high-efficiency polyaluminum chloride water purifying agent, thus solving the technical problems of low flocculation efficiency, slow sedimentation speed, and high treatment cost in the prior art when polyaluminum chloride water purifying agents are used to treat wastewater with complex water quality.

[0060] The high-basicity polyaluminum chloride of the present invention compresses the colloidal double layer through strong electro-neutralization to quickly destroy the stability of pollutants;

[0061] The FeS-TiO2 nanocrystalline nucleus inducer and the ZnO-TiO2@SiO2 heterojunction photocatalytic material act synergistically. The former provides active sites for flocs to enhance adsorption, and the latter excites free radicals under ultraviolet light to degrade organic substances, reducing the pollutant load and making the flocculation process more efficient.

[0062] Carboxymethyl chitosan and the organic chelating agent form a dual chelating mechanism to strengthen the capture ability for heavy metal ions (such as Pb 2+ , Cd 2+ ) and reduce the residual concentration.

[0063] Using industrial waste alkali as an alkaline regulator can reduce the raw material cost by 20%-30%, while reducing the emission of industrial solid waste.

[0064] By coating a 2-5 nm SiO2 passivation layer on the surface of the ZnO-TiO2 heterojunction, while inhibiting the recombination of photo-generated carriers, it endows it with visible light response ability. ZnO-TiO2@SiO2 mainly adsorbs when the light is insufficient and starts photocatalytic degradation when the light is sufficient, adapting to different environmental conditions and improving the energy utilization efficiency.

[0065] The auxiliary flocculant carboxymethyl chitosan forms multiple hydrogen bonds with the surface of the flocs through amino and hydroxyl groups, significantly enhancing the shear resistance of the flocs. Using carbon black with a high specific surface area (1500-2500 m 2 / g) and activated silica gel with a large pore volume (1.8-2.8 mL / g) to construct a gradient pore structure, through the synergistic effect of physical adsorption and ion exchange, deeply purify the residual micro-polluted organic matter and heavy metal ions in water.

[0066] La 3 La+-doped graphene oxide can inhibit the proliferation of microorganisms such as Escherichia coli and cyanobacteria in water, reduce the formation of biofilms, and reduce the subsequent disinfection cost. After the A / B components are premixed, they can be directly added without complex activation steps, simplifying the on-site operation process and saving labor costs.

[0067] Example 1:

[0068] In this example, the preparation method of the high-efficiency polyaluminum chloride water purifier is as follows:

[0069] Preparation of component A: Dry mix 50 parts of high-alkalinity polyaluminum chloride, 5 parts of nanocrystalline nucleus inducer, 3 parts of organic chelating agent, 0.5 part of La 3+ -doped graphene oxide, 2 parts of alkaline regulator, 1 part of heavy metal scavenger, 10 parts of modified graphene-based adsorbent material, 5 parts of ZnO-TiO2 heterojunction nanoparticles and 3 parts of auxiliary flocculant, and ball mill for 1 h until uniform to obtain component A;

[0070] Preparation of component B: Mix 6 parts of carbon black and 9 parts of activated silica gel in proportion, dry at 150 °C for 2 h, and then add 3 parts of boron glue and 1 part of anionic polyacrylamide step by step: first dissolve PAM, and then slowly add boron glue to finally obtain component B;

[0071] Mixing of component A and component B: Mix 75 parts of component A and 25 parts of component B under low-speed stirring for 20 min to obtain the high-efficiency polyaluminum chloride water purifier.

[0072] Example 2:

[0073] In this example, the preparation method of the high-efficiency polyaluminum chloride water purifier is as follows:

[0074] Preparation of Component A: Dry-mix 55 parts of highly basic polyaluminum chloride, 7.5 parts of nanocrystalline nucleus inducer, 5.5 parts of organic chelating agent, 1 part of La 3+ doped graphene oxide, 3 parts of basic regulator, 1 part of heavy metal scavenger, 15 parts of modified graphene-based adsorbent material, 6.5 parts of ZnO-TiO2 heterojunction nanoparticles and 4 parts of auxiliary flocculant, and ball-mill for 1 h until uniform to obtain Component A;

[0075] Preparation of Component B: Mix 8 parts of carbon black and 10.5 parts of activated silica gel in proportion, dry at 150 °C for 2 h, and then add 4 parts of boron glue and 1.5 parts of anionic polyacrylamide step by step: dissolve PAM first, and then slowly add boron glue to finally obtain Component B;

[0076] Mixing of Component A and Component B: Mix 77.5 parts of Component A and 22.5 parts of Component B under low-speed stirring for 20 min to obtain the highly efficient polyaluminum chloride water purifying agent.

[0077] Example 3:

[0078] In this example, the preparation method of the highly efficient polyaluminum chloride water purifying agent is as follows:

[0079] Preparation of Component A: Dry-mix 60 parts of highly basic polyaluminum chloride, 10 parts of nanocrystalline nucleus inducer, 8 parts of organic chelating agent, 1.5 parts of La 3+ doped graphene oxide, 4 parts of basic regulator, 1 part of heavy metal scavenger, 20 parts of modified graphene-based adsorbent material, 8 parts of ZnO-TiO2 heterojunction nanoparticles and 5 parts of auxiliary flocculant, and ball-mill for 1 h until uniform to obtain Component A;

[0080] Preparation of Component B: Mix 10 parts of carbon black and 12 parts of activated silica gel in proportion, dry at 150 °C for 2 h, and then add 5 parts of boron glue and 2 parts of anionic polyacrylamide step by step: dissolve PAM first, and then slowly add boron glue to finally obtain Component B;

[0081] Mixing of Component A and Component B: Mix 75 parts of Component A and 25 parts of Component B under low-speed stirring for 20 min to obtain the highly efficient polyaluminum chloride water purifying agent.

[0082] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand the whole or part of the process of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. An efficient polyaluminum chloride water purifying agent, characterized in that It includes 75 - 80 parts of component A and 20 - 25 parts of component B. The component A includes 50 - 60 parts of highly alkalized polyaluminum chloride, 5 - 10 parts of nanocrystalline nucleus inducer, 3 - 8 parts of organic chelating agent, 0.5 - 1.5 parts of La 3 + doped graphene oxide, 2 - 4 parts of alkaline regulator, 1 part of heavy metal scavenger, 10 - 20 parts of modified graphene-based adsorbent material; The B component includes 6-10 parts of carbon black, 9-12 parts of silica gel and 3-5 parts of boron gel.

2. The efficient polyaluminum chloride water purifying agent according to claim 1, characterized in that The basicity of the highly basic polyaluminum chloride is 88-92%; The specific preparation method of the highly basic polyaluminum chloride is as follows: Mix industrial-grade aluminum chloride and deionized water at a mass ratio of 1:3-5, stir and dissolve at 40-60 °C until clear to obtain an aluminum chloride solution; Slowly add the basifying agent to the aluminum chloride solution at a concentration of 0.5-1.0 mol / L and react for 1-2 hours; Continue to add the basifying agent until the pH of the system rises to 6.0-7.0 and react for 2-3 hours; Transfer the reaction solution to a closed container, dynamically age at 80-90 °C for 4-6 hours, and simultaneously introduce nitrogen protection to prevent oxidation, so that the polyaluminum chloride molecular chains are arranged in an orderly manner to form a stable highly basic structure; Quickly cool the product to room temperature and obtain a solid powder with a basicity of 88-92% by spray drying or vacuum drying.

3. The efficient polyaluminum chloride water purifying agent according to claim 2, characterized in that The nanocrystalline nucleus inducer is a composite nanoparticle made of iron sulfide (FeS) and titanium dioxide (TiO2); The particle size of the composite nanoparticle is 15-25 nm; The molar ratio of iron sulfide (FeS) to titanium dioxide (TiO2): 1:0.8-1.

2.

4. The efficient polyaluminum chloride water purifying agent according to claim 3, characterized in that The preparation method of the modified graphene-based adsorbent is as follows: Add 8 g of graphene oxide to 100 g of deionized water, stir and mix evenly to obtain a graphene oxide dispersion, ultrasonically treat for 3 h under stirring conditions, heat up to 60 °C, stop ultrasonic treatment, and then slowly add 10 mL of an aqueous solution containing 0.5 g of dicyandiamide formaldehyde condensate dropwise under continuous stirring conditions, and continue to keep warm and react for 5 h to obtain the modified graphene-based adsorbent.

5. The efficient polyaluminum chloride water purifying agent according to claim 4, characterized in that The basicity regulator is industrial waste alkali.

6. The efficient polyaluminum chloride water purifying agent according to claim 5, characterized in that The B component further includes 1-2 parts of an auxiliary agent, and the auxiliary agent is an anionic polyacrylamide aqueous solution with a concentration of 0.01-0.05% and a molecular weight greater than 8 million Daltons.

7. The efficient polyaluminum chloride water purifying agent according to claim 6, characterized in that The carbon black is in powder form, its specific surface area is 1500-2500 square meters per gram, and the silica gel is activated silica gel; its pore volume V (the total volume of the internal pores of each gram of silica gel) is 1.8-2.8 mL / g.

8. The efficient polyaluminum chloride water purifying agent according to claim 7, characterized in that The A component further includes 5-8 parts of ZnO-TiO2 heterojunction nanoparticles with a particle size of 20-40 nm, and the ZnO-TiO2 surface is coated with a SiO2 layer with a thickness of 2-5 nm.

9. The efficient polyaluminum chloride water purifying agent according to claim 8, characterized in that The component A further includes 3 - 5 parts of auxiliary flocculant, and the auxiliary flocculant is carboxymethyl chitosan.

10. The high - efficiency polyaluminum chloride water purifying agent according to claim 9, characterized in that The preparation method of the high - efficiency polyaluminum chloride water purifying agent is as follows: Preparation of Component A: Mix highly basic polyaluminum chloride, nanocrystalline nucleus inducer, organic chelating agent, La 3+ -doped graphene oxide, alkaline regulator, heavy metal scavenger, auxiliary flocculant, ZnO-TiO2@SiO2 heterojunction nanoparticles, and modified graphene-based adsorbent materials in proportion by dry mixing, and ball mill for 1 h until uniform to obtain Component A; Preparation of component B: Mix carbon black and active silica gel in proportion, dry at 150 °C for 2 h, and then add boron glue and anionic polyacrylamide step by step: dissolve PAM first, then slowly add boron glue, and finally obtain component B; Mixing of component A and component B: Mix component A and component B under low - speed stirring for 20 min to obtain the high - efficiency polyaluminum chloride water purifying agent.

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