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Composite flocculating agent and preparation method thereof

A composite flocculant, chitosan technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as chemical bond linkage, and achieve the effect of simple operation, wide application range and wide pH value range

Inactive Publication Date: 2011-04-20
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since chitosan and the above-mentioned other flocculant materials cannot be linked by chemical bonds, its practical application effect is limited.

Method used

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  • Composite flocculating agent and preparation method thereof
  • Composite flocculating agent and preparation method thereof
  • Composite flocculating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] [embodiment 1]: chitosan is dissolved in 0.5% hydrochloric acid aqueous solution, is mixed with the solution of chitosan 2%, after the solution is uniform, adds cerium ammonium nitrate as initiator (add-on is chitosan unit mole number 3%), then add acrylamide (mass ratio to chitosan: 5:1), and react for 2 hours at 45°C to obtain the chitosan grafted polyacrylamide product; then add 100% of the original solution volume Isopropanol, and 20% of the volume of the original solution with a 40% NaOH aqueous solution by weight were reacted at 65°C for 3 hours to prepare a chitosan-hydrolyzed polyacrylamide composite flocculant. Through titration analysis, the content of carboxylic acid groups is 15%, and the content of polyacrylamide is 40% (by mass).

[0036] The infrared spectra of chitosan, chitosan-grafted polyacrylamide and chitosan-hydrolyzed polyacrylamide composite flocculant are shown in figure 1 ,from figure 1 see wavenumber 3400nm -1 , 3200nm -1 O-H, N-H characte...

Embodiment 2

[0038][embodiment 2]: chitosan is dissolved in 1.0% hydrochloric acid aqueous solution, is mixed with the solution of chitosan 3%, after the solution is uniform, adds cerium ammonium nitrate as initiator (add-on is chitosan unit mole number 2%), and acrylamide (mass ratio with chitosan: 5: 1), reacted for 2 hours at 45°C to obtain chitosan grafted polyacrylamide product; Alcohol, and 50% of the volume of the original solution with a 10% NaOH aqueous solution by weight were reacted at 85° C. for 4 hours to prepare a chitosan-hydrolyzed polyacrylamide composite flocculant. After analysis, the content of carboxylic acid groups is 10%, and the content of polyacrylamide is 30% (by mass). Its performance is similar to embodiment 1.

Embodiment 3

[0039] [embodiment 3]: chitosan is dissolved in 0.5% acetic acid aqueous solution, is mixed with the solution of chitosan 2%, after the solution is uniform, adds cerium ammonium nitrate as initiator (add-on is chitosan unit mole number 3%), and acrylamide (mass ratio with chitosan: 8: 1), reacted for 2 hours at 45°C to obtain chitosan grafted polyacrylamide; then add 200% isopropanol of the original solution volume , and 50% NaOH aqueous solution with a weight percentage concentration of 5% of the volume of the original solution, and reacted at 55° C. for 1 hour to prepare a chitosan-hydrolyzed polyacrylamide composite flocculant. After analysis, the carboxylic acid group content is 20%, and the polyacrylamide content is 45% (mass). Its performance is similar to embodiment 1.

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PUM

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Abstract

The invention discloses a composite flocculating agent and a preparation method thereof. The composite flocculating agent is a chitosan-hydrolyzed polyacrylamide composite flocculating agent. The preparation method comprises the following steps of: 1, fully dissolving chitosan in acid aqueous solution to obtain chitosan-containing solution; 2, adding a cerium ammonirm nitrate or ammonium persulfate initiator into chitosan solution obtained in the step 1, adding acrylamide and reacting at the temperature of between 45 and 65 DEG C for 1 to 4 hours so as to obtain a chitosan grafted polyacrylamide material; and 3, adding isopropanol into solution of chitosan grafted polyacrylamide obtained in the step 2, adding aqueous solution of sodium hydroxide (NaOH) and reacting at the temperature of between 55 and 80 DEG C for 0.5 to 4 hours so as to obtain the chitosan-hydrolyzed polyacrylamide composite flocculating agent.

Description

technical field [0001] The invention belongs to the technical field of flocculants, and relates to a composite flocculant and a preparation method thereof, in particular to a chitosan-hydrolyzed polyacrylamide composite flocculant and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of industry, the problem of water pollution has become increasingly prominent. At the same time, the continuous improvement of people's material living standards has also put forward higher requirements for water quality. The safety and security of water sources has long attracted the attention of the environmental protection departments of governments in various countries, and has adopted a series of strong safeguard measures including legislation. [0003] However, judging from the current situation of water source pollution and water purification treatment methods, we still face opportunities and challenges. Therefore, effective control o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08B37/08C02F1/56
Inventor 杨琥尚亚波卢耀柏蒋玉祥张文轩秦祖群程镕时王广智
Owner NANJING UNIV
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