CN114053881B - Preparation method of hydrogel filtering membrane for efficiently loading and catalyzing organic pollutants - Google Patents

Preparation method of hydrogel filtering membrane for efficiently loading and catalyzing organic pollutants Download PDF

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CN114053881B
CN114053881B CN202111495172.7A CN202111495172A CN114053881B CN 114053881 B CN114053881 B CN 114053881B CN 202111495172 A CN202111495172 A CN 202111495172A CN 114053881 B CN114053881 B CN 114053881B
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halloysite
silicon dioxide
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valent iron
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CN114053881A (en
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赵孔银
蒋俊
藺塬聖
丁永娇
栗一帆
张世潮
洪乙丹
唐星锐
程乐天
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Shanghai Yuanyiqing Technology Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D71/00Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06Organic material
    • B01D71/08Polysaccharides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D67/00Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0079Manufacture of membranes comprising organic and inorganic components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D69/00Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/74Iron group metals
    • B01J23/745Iron
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/06Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
    • B01J31/069Hybrid organic-inorganic polymers, e.g. silica derivatized with organic groups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/50Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/58Fabrics or filaments
    • B01J35/59Membranes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02Impregnation, coating or precipitation
    • B01J37/0215Coating
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2323/00Details relating to membrane preparation
    • B01D2323/30Cross-linking
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/308Dyes; Colorants; Fluorescent agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/343Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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  • Manufacturing & Machinery (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Aiming at the problems that the finger-shaped holes of the traditional polymer membrane cause low catalytic efficiency, zero-valent iron is easy to oxidize and catalyst in the hydrogel is easy to run off, the invention reports a preparation method of the hydrogel filtering membrane for catalyzing organic pollutants with high-efficiency load. Firstly, mixing and dispersing purified halloysite and ferric chloride aqueous solution, then adding tetraethoxysilane, regulating and controlling pH value to hydrolyze the tetraethoxysilane to obtain silicon dioxide, then dropwise adding sodium borohydride solution to generate a halloysite/silicon dioxide dispersion liquid loaded with zero-valent iron, washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying to obtain halloysite/silicon dioxide particles loaded with zero-valent iron. Dispersing halloysite/silicon dioxide particles loaded with zero-valent iron into sodium alginate aqueous solution to obtain casting solution, scraping the casting solution into a film, soaking the film into metal ion aqueous solution for crosslinking, and thus obtaining the hydrogel filtering film with high-efficiency load catalytic organic pollutants. The membrane has wide application prospect in the field of sewage treatment and environmental protection.

Description

Preparation method of hydrogel filtering membrane for efficiently loading and catalyzing organic pollutants
Technical Field
The invention relates to a preparation method of a hydrogel filtering membrane for efficiently loading and catalyzing organic pollutants, belonging to the field of functional materials and membrane separation.
The invention relates to the technical fields of zero-valent iron preparation and loading, a filtering membrane, hydrogel and the like. In particular to a preparation method of a hydrogel filtering membrane for efficiently loading and catalyzing organic pollutants.
Background
Water resources are one of the most important material resources indispensable to human survival and development. However, with the continuous development of industry, water pollution is also becoming serious. Organic waste is a main aspect of water pollution, and organic pollutants in water are various in variety, complex in composition and toxic, and have great harm to the environment and human bodies. The traditional wastewater treatment methods comprise a physical adsorption method, a chemical method, a biological method, an electrochemical method and the like, but the treatment difficulty of the organic wastewater which is difficult to degrade is great at present, and the requirements of higher and higher environmental protection and technology are not met. Therefore, there is no way to seek efficient and cost effective treatment of organic pollutants.
Because of the characteristics of strong reducing capability, large specific surface area and the like, the zero-valent iron can effectively remove organic pollutants, and the zero-valent iron is loaded in carriers such as a polymer film and the like, so that the catalytic activity of the zero-valent iron can be enhanced. Sikhwivhilu Keneiloe et al graft polymerized acrylic acid or acrylic acid in situ polymerization onto PVDF membranes. The Fe/Ni bimetallic nanoparticles were then immobilized on PVDF membrane. The catalytic degradation performance of the nanocomposite film on methyl orange dye under acidic and neutral conditions was studied. The nano composite film prepared by in-situ polymerization has higher catalytic activity under both acidic and neutral conditions and lower metal leaching rate under neutral conditions, which is attributed to the uniform dispersion of the metal obtained by the method. The membrane can be used to treat neutral pH water containing organic contaminants.
However, the finger-shaped holes of the traditional polymer membrane can cause the problems of low catalytic efficiency, easy oxidation of zero-valent iron, easy loss of catalyst and the like. The polymer gel is a multi-element system composed of a polymer three-dimensional network and a solvent, the hydrogel film is a homogeneous film, has no finger-shaped holes, and can be used as an effective carrier to load zero-valent iron. Liu et al synthesized FeNPs-CaAlg hydrogel films. The result shows that the FeNPs-CaAlg membrane has good filtering performance on dye, the filtering flux is basically the same as that of pure water, and the filtering flux is hardly reduced with the filtering time. The initial removal rate of the FeNPs-CaAlg composite film on crystal violet can reach 96.4 percent. After 3 hours of filtration, the removal rate can still reach 78.4%.
Aiming at the problems that the finger-shaped holes of the traditional polymer membrane cause low catalytic efficiency, zero-valent iron is easy to oxidize and catalyst in the hydrogel is easy to run off, the invention reports a preparation method of the hydrogel filtering membrane for catalyzing organic pollutants with high-efficiency load. Firstly, mixing and dispersing purified halloysite and ferric chloride aqueous solution, then adding tetraethoxysilane, regulating and controlling pH value to hydrolyze the tetraethoxysilane to obtain silicon dioxide, then dropwise adding sodium borohydride solution to generate a halloysite/silicon dioxide dispersion liquid loaded with zero-valent iron, washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying to obtain halloysite/silicon dioxide particles loaded with zero-valent iron. Dispersing halloysite/silicon dioxide particles loaded with zero-valent iron into sodium alginate aqueous solution to obtain casting solution, scraping the casting solution into a film, soaking the film into metal ion aqueous solution for crosslinking, and thus obtaining the hydrogel filtering film with high-efficiency load catalytic organic pollutants. The membrane has wide application prospect in the field of sewage treatment and environmental protection.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problems that the catalytic efficiency is low, zero-valent iron is easy to oxidize, the catalyst in the hydrogel is easy to run off and the like caused by finger-shaped holes of the traditional polymer membrane.
The invention solves the problems of low catalytic efficiency, easy oxidation of zero-valent iron, easy loss of catalyst in hydrogel and the like caused by finger-shaped holes of the traditional polymer membrane, and provides a preparation method of a hydrogel filtering membrane for efficiently loading and catalyzing organic pollutants.
The invention provides a preparation method of a hydrogel filtering membrane for catalyzing organic pollutants with high-efficiency load, which is characterized by comprising the following steps:
a) Firstly, purifying halloysite by using a hydrochloric acid leaching method, uniformly dispersing the purified halloysite in a mixed solution of ethanol and water, adding an aqueous solution of ferric chloride, and fully adsorbing ferric ions on the surface of the halloysite under stirring; then adding ethyl orthosilicate into the mixed solution, regulating the pH value to hydrolyze the ethyl orthosilicate, and generating a layer of silicon dioxide on the surface of halloysite adsorbing ferric ions; then dropwise adding the prepared aqueous solution of the reducing agent to excessive amount, and fully reducing ferric ions into zero-valent iron under the condition of fully stirring and mixing; then washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying under the protection of nitrogen to obtain the zero-valent iron loaded halloysite nanotube coated with silicon dioxide;
b) Ultrasonically dispersing the zero-valent iron-loaded halloysite nanotube coated with the silicon dioxide obtained in the step a) into deionized water, then selecting sodium alginate with the guluronic acid chain segment content of 50% -80%, preparing a mixture aqueous solution with the mass percentage concentration of 0.1% -5% of the sodium alginate as a casting solution, and defoaming for later use;
c) Preparing a metal ion aqueous solution as a coagulation bath;
d) Pouring the casting solution obtained in the step b) after standing and defoaming on a clean glass plate, scraping the glass plate with glass rods with copper wires wound at the two ends and with diameters of 50-1000 mu m, immediately soaking the glass plate and the scraped film in the coagulating bath obtained in the step c) for ionic crosslinking, taking out the film, washing unreacted ions with deionized water, and obtaining a hydrogel filtering film with high-efficiency load for catalyzing organic pollutants;
e) The loading amount of iron ions is controlled by changing the concentration and the adsorption time of the ferric trichloride aqueous solution, and the zero-valent iron stability of the coated silicon dioxide is improved by controlling the concentration of tetraethoxysilane and the amount of the generated silicon dioxide through hydrolysis regulation; the hydrogel filtering membrane obtained by selecting sodium alginate with high guluronic acid chain segment content has better strength and stability.
The reducing agent is any one or two or more of sodium borohydride, potassium borohydride and vitamin C, and the metal ions are any one or two or more of calcium ions, barium ions, lanthanum ions and aluminum ions.
The membrane obtained by the preparation method has wide application prospect in sewage treatment, dye decolorization, antibiotics and other organic pollutants removal.
Detailed Description
Specific embodiments of the present invention are described below, but the present invention is not limited by the embodiments.
Example 1.
a) Firstly, purifying halloysite by using a hydrochloric acid leaching method, uniformly dispersing the purified halloysite in a mixed solution of ethanol and water, adding an aqueous solution of ferric chloride, and fully adsorbing ferric ions on the surface of the halloysite under stirring; then adding ethyl orthosilicate into the mixed solution, regulating the pH value to hydrolyze the ethyl orthosilicate, and generating a layer of silicon dioxide on the surface of halloysite adsorbing ferric ions; then dropwise adding the prepared sodium borohydride aqueous solution to an excessive amount, and fully reducing ferric ions into zero-valent iron under the condition of fully stirring and mixing; then washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying under the protection of nitrogen to obtain the zero-valent iron loaded halloysite nanotube coated with silicon dioxide;
b) Ultrasonically dispersing the zero-valent iron-loaded halloysite nanotube coated with the silicon dioxide obtained in the step a) into deionized water, then selecting sodium alginate with the guluronic acid chain segment content of 50%, preparing a mixture aqueous solution with the mass percent concentration of 2% of sodium alginate as a casting solution, and defoaming for later use;
c) Preparing a calcium ion aqueous solution as a coagulation bath;
d) Pouring the casting solution obtained in the step b) after standing and defoaming on a clean glass plate, scraping the glass plate with glass rods with both ends wound with copper wires with the diameter of 100 mu m, immediately soaking the glass plate and the scraped film in the coagulation bath obtained in the step c) for ionic crosslinking, taking out the film, washing out unreacted ions with deionized water, and obtaining a hydrogel filtering film with high-efficiency load for catalyzing organic pollutants;
e) The loading amount of iron ions is controlled by changing the concentration and the adsorption time of the ferric trichloride aqueous solution, and the zero-valent iron stability of the coated silicon dioxide is improved by controlling the concentration of tetraethoxysilane and the amount of the generated silicon dioxide through hydrolysis regulation; the hydrogel filtering membrane obtained by selecting sodium alginate with high guluronic acid chain segment content has better strength and stability.
Example 2.
a) Firstly, purifying halloysite by using a hydrochloric acid leaching method, uniformly dispersing the purified halloysite in a mixed solution of ethanol and water, adding an aqueous solution of ferric chloride, and fully adsorbing ferric ions on the surface of the halloysite under stirring; then adding ethyl orthosilicate into the mixed solution, regulating the pH value to hydrolyze the ethyl orthosilicate, and generating a layer of silicon dioxide on the surface of halloysite adsorbing ferric ions; then dropwise adding the prepared potassium borohydride aqueous solution to an excessive amount, and fully reducing ferric ions into zero-valent iron under the condition of fully stirring and mixing; then washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying under the protection of nitrogen to obtain the zero-valent iron loaded halloysite nanotube coated with silicon dioxide;
b) Ultrasonically dispersing the zero-valent iron-loaded halloysite nanotube coated with the silicon dioxide obtained in the step a) into deionized water, then selecting sodium alginate with 60% of guluronic acid chain segment content, preparing a mixture aqueous solution with 3% of sodium alginate by mass percentage concentration as a casting solution, and defoaming for later use;
c) Preparing barium ion water solution as coagulating bath;
d) Pouring the casting solution obtained in the step b) after standing and defoaming on a clean glass plate, scraping the glass plate with a glass rod with two ends wound with copper wires with the diameter of 300 mu m, immediately soaking the glass plate and the scraped film in the coagulating bath obtained in the step c) for ionic crosslinking, taking out the film, washing unreacted ions with deionized water, and obtaining a hydrogel filtering film with high-efficiency load for catalyzing organic pollutants;
e) The loading amount of iron ions is controlled by changing the concentration and the adsorption time of the ferric trichloride aqueous solution, and the zero-valent iron stability of the coated silicon dioxide is improved by controlling the concentration of tetraethoxysilane and the amount of the generated silicon dioxide through hydrolysis regulation; the hydrogel filtering membrane obtained by selecting sodium alginate with high guluronic acid chain segment content has better strength and stability.
Example 3.
a) Firstly, purifying halloysite by using a hydrochloric acid leaching method, uniformly dispersing the purified halloysite in a mixed solution of ethanol and water, adding an aqueous solution of ferric chloride, and fully adsorbing ferric ions on the surface of the halloysite under stirring; then adding ethyl orthosilicate into the mixed solution, regulating the pH value to hydrolyze the ethyl orthosilicate, and generating a layer of silicon dioxide on the surface of halloysite adsorbing ferric ions; then dropwise adding the prepared vitamin C aqueous solution to an excessive amount, and fully reducing ferric ions into zero-valent iron under the condition of fully stirring and mixing; then washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying under the protection of nitrogen to obtain the zero-valent iron loaded halloysite nanotube coated with silicon dioxide;
b) Ultrasonically dispersing the zero-valent iron-loaded halloysite nanotube coated with the silicon dioxide obtained in the step a) into deionized water, then selecting sodium alginate with the content of guluronic acid chain segments of 70%, preparing a mixture aqueous solution with the mass percent concentration of 4% of sodium alginate as a casting solution, and defoaming for later use;
c) Preparing lanthanum ion water solution as coagulating bath;
d) Pouring the casting solution obtained in the step b) after standing and defoaming on a clean glass plate, scraping the glass plate with a glass rod with two ends wound with copper wires with the diameter of 500 mu m, immediately soaking the glass plate and the scraped film in the coagulating bath obtained in the step c) for ionic crosslinking, taking out the film, washing unreacted ions with deionized water, and obtaining a hydrogel filtering film with high-efficiency load for catalyzing organic pollutants;
e) The loading amount of iron ions is controlled by changing the concentration and the adsorption time of the ferric trichloride aqueous solution, and the zero-valent iron stability of the coated silicon dioxide is improved by controlling the concentration of tetraethoxysilane and the amount of the generated silicon dioxide through hydrolysis regulation; the hydrogel filtering membrane obtained by selecting sodium alginate with high guluronic acid chain segment content has better strength and stability.
Example 4.
a) Firstly, purifying halloysite by using a hydrochloric acid leaching method, uniformly dispersing the purified halloysite in a mixed solution of ethanol and water, adding an aqueous solution of ferric chloride, and fully adsorbing ferric ions on the surface of the halloysite under stirring; then adding ethyl orthosilicate into the mixed solution, regulating the pH value to hydrolyze the ethyl orthosilicate, and generating a layer of silicon dioxide on the surface of halloysite adsorbing ferric ions; then dropwise adding the prepared sodium borohydride aqueous solution to an excessive amount, and fully reducing ferric ions into zero-valent iron under the condition of fully stirring and mixing; then washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying under the protection of nitrogen to obtain the zero-valent iron loaded halloysite nanotube coated with silicon dioxide;
b) Ultrasonically dispersing the zero-valent iron-loaded halloysite nanotube coated with the silicon dioxide obtained in the step a) into deionized water, then selecting sodium alginate with the guluronic acid chain segment content of 80%, preparing a mixture aqueous solution with the mass percent concentration of 1% of the sodium alginate as a casting solution, and defoaming for later use;
c) Preparing an aluminum ion aqueous solution as a coagulation bath;
d) Pouring the casting solution obtained in the step b) after standing and defoaming on a clean glass plate, scraping the glass plate with a glass rod with two ends wound with copper wires with the diameter of 600 mu m, immediately soaking the glass plate and the scraped film in the coagulating bath obtained in the step c) for ionic crosslinking, taking out the film, washing unreacted ions with deionized water, and obtaining a hydrogel filtering film with high-efficiency load for catalyzing organic pollutants;
e) The loading amount of iron ions is controlled by changing the concentration and the adsorption time of the ferric trichloride aqueous solution, and the zero-valent iron stability of the coated silicon dioxide is improved by controlling the concentration of tetraethoxysilane and the amount of the generated silicon dioxide through hydrolysis regulation; the hydrogel filtering membrane obtained by selecting sodium alginate with high guluronic acid chain segment content has better strength and stability.

Claims (3)

1. The preparation method of the hydrogel filtering membrane for catalyzing organic pollutants with high-efficiency load is characterized by comprising the following steps of:
a) Firstly, purifying halloysite by using a hydrochloric acid leaching method, uniformly dispersing the purified halloysite in a mixed solution of ethanol and water, adding an aqueous solution of ferric chloride, and fully adsorbing ferric ions on the surface of the halloysite under stirring; then adding ethyl orthosilicate into the mixed solution, regulating the pH value to hydrolyze the ethyl orthosilicate, and generating a layer of silicon dioxide on the surface of halloysite adsorbing ferric ions; the prepared aqueous reducing agent solution is then added dropwise to an excess,
reducing ferric ions into zero-valent iron under the condition of fully stirring and mixing; then washing with ethanol to remove unreacted substances, and carrying out suction filtration and drying under the protection of nitrogen to obtain the zero-valent iron loaded halloysite nanotube coated with silicon dioxide;
b) Ultrasonically dispersing the zero-valent iron-loaded halloysite nanotube coated with the silicon dioxide obtained in the step a) into deionized water, then selecting sodium alginate with the guluronic acid chain segment content of 50% -80%, preparing a mixture aqueous solution with the mass percentage concentration of 0.1% -5% of the sodium alginate as a casting solution, and defoaming for later use;
c) Preparing a metal ion aqueous solution as a coagulation bath; the metal ions are any one or a mixture of two or more of calcium ions, barium ions, lanthanum ions and aluminum ions;
d) Pouring the casting solution obtained in the step b) after standing and defoaming on a clean glass plate, scraping the glass plate with glass rods with copper wires wound at the two ends and with diameters of 50-1000 mu m, immediately soaking the glass plate and the scraped film in the coagulating bath obtained in the step c) for ionic crosslinking, taking out the film, washing unreacted ions with deionized water, and obtaining a hydrogel filtering film with high-efficiency load for catalyzing organic pollutants;
e) The loading amount of iron ions is controlled by changing the concentration and the adsorption time of the ferric trichloride aqueous solution, and the zero-valent iron stability of the coated silicon dioxide is improved by controlling the concentration of tetraethoxysilane and the amount of the generated silicon dioxide through hydrolysis regulation; the hydrogel filtering membrane obtained by selecting sodium alginate with high guluronic acid chain segment content has better strength and stability.
2. The method for preparing a hydrogel filtering membrane for catalyzing organic pollutants with high-efficiency load as claimed in claim 1, wherein the reducing agent is any one or a mixture of two or more of sodium borohydride, potassium borohydride and vitamin C.
3. The use of a membrane obtained by the method for preparing a hydrogel filtration membrane for high-efficiency loading catalytic organic pollutants according to claim 1 in oil-water separation, dye decolorization and antibiotic removal.
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CN104759635A (en) * 2015-03-12 2015-07-08 中国科学院福建物质结构研究所 Preparation method of load type nanometer zero-valent iron composite material
CN111111607A (en) * 2018-10-31 2020-05-08 中国地质大学(北京) Preparation method and application of modified kaolinite and nano zero-valent iron/modified kaolinite composite material
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