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A kind of ph, temperature double sensitive chitosan flocculant and its preparation method and application

A dual-sensitivity, chitosan technology, applied in the direction of flocculation/sedimentation water/sewage treatment, can solve problems such as limited application range, achieve no secondary pollution risk, wide application range, good salt resistance and network combined ability effect

Active Publication Date: 2017-10-10
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems that the existing flocculants cannot be sensitive to pH and temperature at the same time, and the scope of application is limited, the present invention provides a chitosan flocculant with dual sensitivity to pH and temperature, its preparation method and application, which consists of carboxymethyl Chitosan is obtained by graft copolymerization with dimethyl diallyl ammonium chloride and N-isopropylacrylamide under acidic conditions. The flocculant of the present invention has both pH sensitivity and temperature sensitivity, which not only improves The molecular weight is increased, the bridging flocculation is enhanced, and it can also meet the requirements of flocculation and removal of water pollutants with different characteristics under different environmental conditions, especially for pollutants with surface charges and hydrophilic / hydrophobic conversions. Flocculation ability

Method used

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  • A kind of ph, temperature double sensitive chitosan flocculant and its preparation method and application
  • A kind of ph, temperature double sensitive chitosan flocculant and its preparation method and application
  • A kind of ph, temperature double sensitive chitosan flocculant and its preparation method and application

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Embodiment 1

[0051] Such as figure 2 As shown, chitosan (viscosity-average molecular weight 800,000, degree of deacetylation 85%) is dispersed in the sodium hydroxide solution (solvent is the mixed solvent of water and isopropanol, wherein water and isopropanol The mass ratio of alcohol is 1:2), wherein the mass ratio of chitosan and sodium hydroxide solution is 1:10, alkalized for 1 hour; after that, adding chloroacetic acid mass percentage concentration is 40% isopropanol solution (wherein solution The mass ratio of chloroacetic acid and chitosan in the solution is 1.5:1), reacted at 50°C for 4 hours, and used ethanol as a precipitating agent after the completion of the reaction (the volume ratio of ethanol to the reaction system solution was 2:1), precipitated and separated, Carboxymethyl chitosan was obtained. Carboxymethyl chitosan is dissolved in the hydrochloric acid aqueous solution that mass percent concentration is 1%, is configured into the solution that carboxymethyl chitosan...

Embodiment 2

[0053] Chitosan (viscosity-average molecular weight 110,000, deacetylation degree 82%) is dispersed in the sodium hydroxide solution (solvent is water and Virahol mixed solvent, wherein the quality of water and Virahol Ratio is 1:10), wherein the mass ratio of chitosan and sodium hydroxide solution is 1:40, alkalized for 1 hour; after that, adding chloroacetic acid mass percentage concentration is 10% isopropanol solution (wherein the chlorine in the solution The mass ratio of acetic acid and chitosan is 0.5:1), reacted at 70°C for 1 hour, and after the reaction was completed, ethanol was used as a precipitating agent (the volume ratio of ethanol to the reaction system solution was 2:1), and precipitation was separated to obtain carboxymethyl base chitosan. Carboxymethyl chitosan is dissolved in the hydrochloric acid aqueous solution that mass percent concentration is 2%, is configured into the solution that carboxymethyl chitosan mass percent concentration is 2%, after the so...

Embodiment 3

[0057] Chitosan (viscosity-average molecular weight 290,000, degree of deacetylation 70%) is dispersed in the sodium hydroxide solution (solvent is the mixed solvent of water and Virahol, wherein the quality of water and Virahol Ratio is 1:10), wherein the mass ratio of chitosan and sodium hydroxide solution is 1:8, alkalized for 2 hours; after that, adding chloroacetic acid mass percent concentration is 30% isopropanol solution (wherein the chlorine in the solution The mass ratio of acetic acid and chitosan is 3:1), reacted at 80°C for 2 hours, and after the reaction was completed, ethanol was used as a precipitating agent (the volume ratio of ethanol to the reaction system solution was 2:1), and precipitation and separation were carried out to obtain carboxymethyl base chitosan. Carboxymethyl chitosan is dissolved in the hydrochloric acid aqueous solution that mass percentage concentration is 1.5%, is configured into the solution that carboxymethyl chitosan mass percentage c...

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Abstract

The invention discloses a chitosan flocculant with dual sensitivity to pH and temperature, a preparation method and application thereof, and belongs to the field of polymer compounds. It is obtained by graft copolymerization of carboxymethyl chitosan with dimethyl diallyl ammonium chloride and N-isopropylacrylamide under acidic conditions. The flocculant of the present invention has pH sensitivity and temperature sensitivity simultaneously. Sensitivity, not only increases the molecular weight, enhances the bridging flocculation, but also meets the requirements for flocculation removal of water pollutants with different characteristics under different environmental conditions, especially for pollution with surface charge and hydrophilic / hydrophobic conversion. It has excellent flocculation ability. The raw material chitosan has a wide range of sources, non-toxic, degradable, and no risk of secondary pollution; it has good characteristics of flocculating heavy metal ions and small molecule organic pollutants, and has many functions such as antibacterial, deodorizing, decolorizing, and effectively reducing COD value. Function.

Description

technical field [0001] The invention belongs to the field of macromolecular compounds, and more specifically relates to a chitosan flocculant with dual sensitivity to pH and temperature and its preparation method and application. Background technique [0002] Water is the source of life. Human survival, life and production are inseparable from water. However, in recent years, my country's water pollution problem has become more and more serious, and it has become one of the important problems that hinder the rapid and healthy development of my country's economy and affect the further improvement of people's living standards. It is imminent to protect water resources and control water pollution. [0003] In June 2008, the state revised and promulgated and implemented the "Water Pollution Prevention and Control Law of the People's Republic of China", which played a huge role in the prevention and control of water pollution; since then, new industries including pulp and paper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F226/02C08F220/54C02F1/56
Inventor 杨朕杨维本贾淑颖卓宁王芳王玉萍
Owner NANJING NORMAL UNIVERSITY
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