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

A cationic chitosan and ultraviolet light technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of chitosan flocculant structure and performance impact, so as to increase the positive charge density and active sites, and reduce costs , the effect of mild reaction conditions

Inactive Publication Date: 2021-06-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the advantages of simple preparation process, etc., but it needs to be stirred and mixed at 70-90°C during the preparation process. High temperature may affect the structure and performance of chitosan flocculant, and medium-strong acid is used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This implementation provides a cationic chitosan-based flocculant initiated by low-pressure ultraviolet light and a preparation method thereof, which comprises the following steps:

[0030] 1) Add 0.9g of chitosan powder into 30ml of 1% acetic acid solution, stir and dissolve evenly after magnetic stirring at a speed of 1500r / min, then add 3.6g of acrylamide monomer, stir again to dissolve , while preparing 10ml of 0.06g / ml potassium persulfate solution.

[0031] 2) Into the chitosan / acetic acid solution obtained in step 1), feed nitrogen (purity is 99.99%) to drive away oxygen, after 10min, continue to feed nitrogen (purity is 99.99%), and add 3ml acryloyl oxygen Ethyltrimethylammonium chloride monomer (the ratio of its mass to chitosan is 10:3, the ratio of acrylamide to its mass is 3:2.5) and 2ml 0.06g / ml initiator potassium persulfate solution ( It accounts for 0.9% by mass of the acryloyloxyethyltrimethylammonium chloride monomer), and it is shaken for 5 minutes t...

Embodiment 2

[0037] This implementation provides a cationic chitosan-based flocculant initiated by low-pressure ultraviolet light and a preparation method thereof, which comprises the following steps:

[0038] 1) Add 1.2g of chitosan powder into 30ml of 1% acetic acid solution, stir and dissolve evenly after magnetic stirring at a speed of 1500r / min, then add 3.6g of acrylamide monomer, stir again to dissolve , while preparing 10ml of 0.06g / ml potassium persulfate solution.

[0039]2) Into the chitosan / acetic acid solution obtained in step 1), feed nitrogen (purity is 99.99%) to drive away oxygen, after 10min, continue to feed nitrogen (purity is 99.99%), and add 3ml acryloyl oxygen Ethyltrimethylammonium chloride monomer (its mass ratio to chitosan is 10:4, acrylamide to its mass ratio is 3:2.5) and 2ml 0.06g / ml initiator potassium persulfate solution ( It accounts for 0.9% by mass of the acryloyloxyethyltrimethylammonium chloride monomer), and it is shaken for 5 minutes to make it fully...

Embodiment 3

[0045] This implementation provides a cationic chitosan-based flocculant initiated by low-pressure ultraviolet light and a preparation method thereof, which comprises the following steps:

[0046] 1) Add 1.5g of chitosan powder into 30ml of 1% acetic acid solution, stir and dissolve evenly after magnetic stirring at a speed of 1500r / min, then add 3.6g of acrylamide monomer, stir again to dissolve , while preparing 10ml of 0.06g / ml potassium persulfate solution.

[0047] 2) Into the chitosan / acetic acid solution obtained in step 1), feed nitrogen (purity is 99.99%) to drive away oxygen, after 10min, continue to feed nitrogen (purity is 99.99%), and add 3ml acryloyl oxygen Ethyltrimethylammonium chloride monomer (its mass ratio to chitosan is 10:5, acrylamide to its mass ratio is 3:2.5) and 2ml 0.06g / ml initiator potassium persulfate solution ( It accounts for 0.9% by mass of the acryloyloxyethyltrimethylammonium chloride monomer), and it is shaken for 5 minutes to make it full...

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PUM

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Abstract

The invention discloses a preparation method of a cationic chitosan-based flocculant initiated by low-pressure ultraviolet light and an application thereof, and the preparation method comprises the following steps: 1) completely dissolving chitosan with an acetic acid solution, and dissolving potassium persulfate with deionized water; 2) adding an acrylamide (AM) monomer into the chitosan solution, stirring and dissolving, introducing nitrogen for protection, and sequentially adding an acryloyloxyethyl trimethyl ammonium chloride (DAC) monomer and an initiator potassium persulfate solution; 3) in a nitrogen atmosphere, initiating a free radical graft copolymerization reaction through irradiation of low-pressure ultraviolet light; and 4) curing the reacted product, dissolving the product in deionized water, purifying the product with absolute ethyl alcohol, and drying the purified product to obtain the cationic chitosan-based flocculant. The cationic chitosan-based flocculant prepared by the preparation method disclosed by the invention is high in relative molecular weight, good in stability and good in turbidity removal effect.

Description

technical field [0001] The invention belongs to the technical field of flocculants, and in particular relates to a low-pressure ultraviolet-induced cationic chitosan-based flocculant and its preparation method and application. 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 poor, and the cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/34C08F2/48C02F1/56
CPCC08F251/00C08F2/48C02F1/56C08F220/56C08F220/34
Inventor 王宇轩钟政冮沁彦郑怀礼赵瑞万鑫源蒋君怡
Owner CHONGQING UNIV
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