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Preparation method and application of cationic chitosan-based magnetic flocculant initiated by low-pressure ultraviolet light

A cationic chitosan and magnetic flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that the effect and active site are not as good as organic flocculants To achieve the effect of increasing positive charge density and active sites, mild reaction conditions, and reducing implosion phenomenon

Inactive Publication Date: 2021-08-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite flocculant is stable in quality, high in basicity, and has certain reducing properties, but it is an inorganic flocculant, and its effect and active sites are not as good as organic flocculants, and strong acid and strong alkali are used in the preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This implementation provides a cationic chitosan-based magnetic flocculant initiated by low pressure ultraviolet light and a preparation method thereof, which comprises the following steps:

[0039] 1) Add 1.2g Fe 3 o 4 Disperse evenly in a mixed solution of 400ml alcohol and 200ml deionized water, inject 6ml of ammonia solution with a mass fraction of 25% after ultrasonication for 10 minutes;

[0040] 2) Slowly add 18ml TEOS to the solution obtained in step 1) under continuous stirring, and react for 8 hours under stirring at room temperature;

[0041] 3) Wash the solution obtained in step 2) with alcohol and deionized water several times, and dry it in vacuum at 60°C to obtain Fe 3 o 4 @SiO 2 nanoparticles;

[0042] 4) Evenly disperse 0.9 g of the product obtained in step 3) in 200 ml of alcohol, sonicate for 10 minutes, then pass nitrogen gas (99.99% purity) for 10 minutes, and heat in a water bath at 78 ° C. When heated to 62 ° C, stir and add 9 ml 3-(methacry...

Embodiment 2

[0051] This implementation provides a cationic chitosan-based magnetic flocculant initiated by low pressure ultraviolet light and a preparation method thereof, which comprises the following steps:

[0052] 1) Add 1.2g Fe 3 o 4 Disperse evenly in a mixed solution of 400ml alcohol and 200ml deionized water, inject 6ml of ammonia solution with a mass fraction of 25% after ultrasonication for 10 minutes;

[0053] 2) Slowly add 18ml TEOS (tetraethyl orthosilicate) to the solution obtained in step 1) under continuous stirring, and react for 8 hours under stirring at room temperature;

[0054] 3) Wash the solution obtained in step 2) with alcohol and deionized water several times, and dry it in vacuum at 60°C to obtain Fe 3 o 4 @SiO 2 nanoparticles;

[0055] 4) Evenly disperse 0.9 g of the product obtained in step 3) in 200 ml of alcohol, sonicate for 10 minutes, then pass nitrogen gas (99.99% purity) for 10 minutes, and heat in a water bath at 78 ° C. When heated to 62 ° C, sti...

Embodiment 3

[0064] This implementation provides a cationic chitosan-based magnetic flocculant initiated by low pressure ultraviolet light and a preparation method thereof, which comprises the following steps:

[0065] 1) Add 1.2g Fe 3 o 4 Disperse evenly in a mixed solution of 400ml alcohol and 200ml deionized water, inject 6ml of ammonia solution with a mass fraction of 25% after ultrasonication for 10 minutes;

[0066] 2) Slowly add 18ml TEOS (tetraethyl orthosilicate) to the solution obtained in step 1) under continuous stirring, and react for 8 hours under stirring at room temperature;

[0067] 3) Wash the solution obtained in step 2) with alcohol and deionized water several times, and dry it in vacuum at 60°C to obtain Fe 3 o 4 @SiO 2 nanoparticles;

[0068] 4) Evenly disperse 0.9 g of the product obtained in step 3) in 200 ml of alcohol, sonicate for 10 minutes, then pass nitrogen gas (99.99% purity) for 10 minutes, and heat in a water bath at 78 ° C. When heated to 62 ° C, sti...

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Abstract

The invention discloses a preparation method and application of a cationic chitosan-based magnetic flocculant initiated by low-pressure ultraviolet light. The preparation method comprises the steps of dispersing Fe3O4 nanoparticles in a mixed solution of alcohol and deionized water, adding ammonia water and tetraethyl orthosilicate, and reacting to obtain Fe3O4@SiO2 nanoparticles; dispersing Fe3O4@SiO2 in alcohol, adding an alcohol solution of 3-(methacryloyloxy) propyltrimethoxysilane under the condition of nitrogen, and reacting to obtain Fe3O4@SiO2-MPS nanoparticles; and adding an acrylamide monomer and the Fe3O4@SiO2-MPS nanoparticles into an acetic acid solution of chitosan, introducing nitrogen for protection, sequentially adding a potassium persulfate solution and an acryloyloxyethyl trimethyl ammonium chloride monomer, carrying out low-pressure ultraviolet irradiation to initiate a graft copolymerization reaction, and curing, purifying and drying the reacted product to obtain the cationic chitosan-based magnetic flocculant. The cationic chitosan-based magnetic flocculant prepared by the preparation method disclosed by the invention is high in relative molecular weight, good in stability and good in chromium ion removal effect.

Description

technical field [0001] The invention belongs to the technical field of flocculants, and in particular relates to a preparation method and application of a cationic chitosan-based magnetic flocculant induced by low-pressure ultraviolet light. Background technique [0002] Water is the source of life and the material basis for the survival of all living things on earth. However, with the rapid development of economic globalization and human society, the problem of water resources is becoming more and more serious. About 1.2 billion people around the world do not have access to safe drinking water, and millions of people die every year due to drinking unsafe water. Therefore, how to efficiently treat and utilize sewage is a common problem faced by the whole world today. Flocculation is an efficient method for sewage treatment, and flocculant and its application are the core of this technology. However, the dosage of inorganic flocculants is large, the treatment effect is poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F101/22
CPCC02F1/56C02F2101/22
Inventor 冮沁彦章晨王宇轩赵瑞郑怀礼江欣承黄瑶瑶
Owner CHONGQING UNIV
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