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Method using plasma to induce synthesis of chitosan-based flocculant

A plasma and chitosan technology, applied in the direction of flocculation/precipitation water/sewage treatment, etc., can solve the problems of destroying the molecular structure of polymers, reagent pollution, high energy consumption, and achieve enhanced water solubility, strong hydration ability, and performance. excellent effect

Inactive Publication Date: 2018-12-18
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for synthesizing chitosan-based flocculants using plasma, which solves the problems of high energy consumption, easy contamination of reagents and damage to the molecular structure of polymers in existing preparation methods. The problem

Method used

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  • Method using plasma to induce synthesis of chitosan-based flocculant

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Effect test

Embodiment 1

[0028] The preparation method of present embodiment chitosan-based flocculant comprises the steps:

[0029] 1) Add 2g of chitosan powder into 25mL of dilute acetic acid solution with a mass fraction of 1.0%, and stir slowly until dissolved to obtain an aqueous solution of chitosan;

[0030] 2) Weigh 8.2g of acrylamide and 3.8g of methacryloyloxyethyltrimethylammonium chloride in turn, put them into the reactor, add 28g of deionized water, stir evenly, and prepare a total concentration of 30%. Monomer solution;

[0031] 3) Add chitosan aqueous solution to the above-mentioned total monomer solution, stir evenly, then add sodium hydroxide solution or hydrogen chloride solution, and adjust the pH value of the above-mentioned mixed solution to 4.5;

[0032] 4) Place the above-mentioned mixed solution in a glow discharge electrolysis device, and use plasma to initiate a polymerization reaction. First fill the reaction device with high-purity nitrogen to remove oxygen for 15 minute...

Embodiment 2

[0036] The preparation method of present embodiment chitosan-based flocculant comprises the steps:

[0037] 1) Add 2g of chitosan powder into 25mL of dilute acetic acid solution with a mass fraction of 1.0%, and stir slowly until dissolved to obtain an aqueous solution of chitosan;

[0038] 2) Weigh 9.5g of acrylamide and 4.5g of methacryloyloxyethyltrimethylammonium chloride in turn, put them into the reactor, add 26g of deionized water, stir evenly, and prepare a total concentration of 35%. Monomer solution;

[0039] 3) Add chitosan aqueous solution to the above-mentioned total monomer solution, stir evenly, then add sodium hydroxide solution or hydrogen chloride solution, and adjust the pH value of the above-mentioned mixed solution to 5;

[0040]4) Place the above-mentioned mixed solution in a glow discharge electrolysis device, and use plasma to initiate a polymerization reaction. First fill the reaction device with high-purity nitrogen to remove oxygen for 20 minutes, ...

Embodiment 3

[0044] The preparation method of present embodiment chitosan-based flocculant comprises the steps:

[0045] 1) Add 1.5g of chitosan powder into 20mL of dilute acetic acid solution with a mass fraction of 1.0%, and stir slowly until dissolved to obtain an aqueous solution of chitosan;

[0046] 2) Weigh 6.8g of acrylamide and 2.7g of methacryloyloxyethyltrimethylammonium chloride in turn, put them into the reactor, add 36g of deionized water, stir evenly, and prepare a total concentration of 20.9%. Monomer solution;

[0047] 3) Add chitosan aqueous solution to the above-mentioned total monomer solution, stir evenly, then add sodium hydroxide solution or hydrogen chloride solution, and adjust the pH value of the above-mentioned mixed solution to 5;

[0048] 4) Place the above-mentioned mixed solution in a glow discharge electrolysis device, and use plasma to initiate a polymerization reaction. First fill the reaction device with high-purity nitrogen to remove oxygen for 25 minu...

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Abstract

The invention discloses a method using plasma to induce synthesis of a chitosan-based flocculant, and the method is as follows: sequentially adding an acrylamide monomer, a methacryloxyethyltrimethylammonium chloride monomer, deionized water and a chitosan aqueous solution in a reaction device, stirring evenly, adjusting pH value, deoxidizing with nitrogen, putting the system in a glow dischargeelectrolysis device for polymerization reaction induced by the plasma at a certain voltage, and finally carrying out post-polymerization at a certain temperature, washing, purifying, drying in a vacuum drying oven and grinding to obtain a polymerization product. The chitosan-based flocculant prepared by the method has large molecular weight, strong positive polarity and good solubility, and greatly enhances the flocculation performance of the flocculant. The method does not need an initiator, the product is pure, the operation is simple, the reaction condition is mild, the operation is simplified, the energy consumption is reduced, the production cost is reduced, and the method is green and environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of flocculant preparation, in particular to a method for synthesizing a chitosan-based flocculant by using plasma. Background technique [0002] Flocculation refers to a method of adding a certain amount of flocculant to make suspended particles in water collide, gather and form larger flocs, thereby accelerating the settlement of particles to achieve solid-liquid separation. Flocculation is the most critical link in water treatment, and its effect directly affects the operation of subsequent processes and the final water quality. Flocculation is mainly used for the removal of suspended solids and colloids in water. In addition, it can also be used to remove water pollutants such as algae, organic matter, heavy metals, and pathogenic microorganisms. [0003] There are many kinds of traditional flocculants, which can be roughly divided into three types: inorganic flocculants, organic flocculants and microbial floccula...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/34C08F2/46C02F1/56
CPCC02F1/56C08F2/46C08F251/00C08F220/56C08F220/34
Inventor 郑怀礼王莫茜刘永芝刘鸿霞李俊孙强
Owner CHONGQING UNIV
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