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A kind of method using titanium dioxide as initiator to prepare chitosan-based flocculant

A technology of titanium dioxide and maleylated chitosan is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc. The effect of high production efficiency and low production cost

Active Publication Date: 2022-04-19
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is more complicated to operate, and needs to use strong acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh a certain amount of chitosan and maleic anhydride in pure water according to the mass ratio of 1.5:1 to make a solution with a total concentration of 15%, slowly add glacial acetic acid dropwise and continue in a 30°C water bath Give it a quick stir. After reacting for 4h, dry in vacuum at 50°C to obtain maleylated chitosan.

[0029] 2) According to the mass ratio of 3-(2-thienyl)acrylic acid and maleylated chitosan 3:1, weigh a certain amount of 3-(2-thienyl)acrylic acid and maleylated chitosan and completely dissolve in In pure water, make a solution with a total concentration of 20%, and then add a certain amount of urea into the reactor according to the ratio of urea to maleylated chitosan mass ratio of 2:1 and stir quickly until the two are completely dissolved .

[0030] 3) After passing nitrogen to drive oxygen, add initiator titanium dioxide into the reactor at a mass ratio of titanium dioxide to maleylated chitosan of 0.03:1 and stir evenly; the init...

Embodiment 2

[0033] 1) Weigh a certain amount of chitosan and maleic anhydride in pure water according to the mass ratio of 2:1 to make a solution with a total concentration of 20%, slowly add glacial acetic acid dropwise and continue in a 40°C water bath Give it a quick stir. After reacting for 5 hours, dry in vacuum at 60°C to obtain maleylated chitosan.

[0034] 2) According to the mass ratio of 3-(2-thienyl)acrylic acid and maleylated chitosan 4:1, weigh a certain amount of 3-(2-thienyl)acrylic acid and maleylated chitosan and completely dissolve in In pure water, make a solution with a total concentration of 30%, and then add a certain amount of urea into the reactor according to the ratio of urea to maleylated chitosan mass ratio of 2.5:1 and stir quickly until the two are completely dissolved .

[0035] 3) After passing nitrogen to drive oxygen, add initiator titanium dioxide into the reactor according to the ratio of titanium dioxide to maleylated chitosan mass ratio of 0.06:1 an...

Embodiment 3

[0038] 1) Weigh a certain amount of chitosan and maleic anhydride in pure water according to the mass ratio of 1.7:1 to make a solution with a total concentration of 17%, slowly add glacial acetic acid dropwise and continue in a 35°C water bath Give it a quick stir. After reacting for 4.5h, dry in vacuum at 55°C to obtain maleylated chitosan.

[0039] 2) According to the mass ratio of 3-(2-thienyl)acrylic acid and maleylated chitosan 3.5:1, weigh a certain amount of 3-(2-thienyl)acrylic acid and maleylated chitosan and completely dissolve in In pure water, make a solution with a total concentration of 25%, then add a certain amount of urea into the reactor at a ratio of 2.2:1 by mass ratio of urea to maleylated chitosan and stir quickly until the two are completely dissolved .

[0040] 3) After passing nitrogen to drive oxygen, add initiator titanium dioxide into the reactor at a mass ratio of titanium dioxide to maleylated chitosan of 0.04:1 and stir evenly; the initiator t...

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PUM

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Abstract

The invention discloses a method for preparing a chitosan-based flocculant by using titanium dioxide as an initiator. The method is to take chitosan, maleic anhydride, 3-(2-thienyl) acrylic acid as raw materials, and urea as cosolvent; prepare maleylated chitosan earlier, then maleylated chitosan and 3 Dissolve ‑(2‑thienyl)acrylic acid in pure water, stir until it is completely dissolved; pass nitrogen to drive oxygen, and add titanium dioxide initiator; then react under low-pressure ultraviolet mercury lamp irradiation for 6~8h; wait for the product to age Finally, the product is extracted and purified to obtain the modified chitosan flocculant. The preparation method of the present invention has the advantages of simple process, stable reaction, easy control and low energy consumption, and the obtained modified chitosan flocculant has good stability and is easy to dissolve; and has a good treatment effect on surface water containing heavy metals and landfill leachate, There are good social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for preparing a chitosan-based flocculant by using titanium dioxide as an initiator. Background technique [0002] With the development of society and economy, my country pays more and more attention to the protection of water environment. There are many methods of water treatment. Compared with other water treatment methods, coagulation has been widely valued and applied due to its advantages of simplicity, high efficiency and low investment. With the development of science and technology, the types of flocculants are also increasing. For sewage treatment, the ability to properly select and use a flocculant with excellent performance is the key to meeting the treatment requirements. Flocculants are mainly divided into inorganic flocculants, organic flocculants and microbial flocculants. Compared with inorganic flocculants, organic polymer flocculants have t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F228/06C08F2/48C08B37/08C02F1/52C02F101/20
CPCC08F251/00C08F2/48C08B37/003C02F1/5263C02F2101/20C08F228/06
Inventor 黄静唐晓旻张世欣王韬向靖
Owner CHONGQING TECH & BUSINESS UNIV