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Straw modified into amphiprotic adsorbent and preparation method thereof

An amphoteric and adsorbent technology, applied in other chemical processes, chemical instruments and methods, etc., can solve problems such as complex components, and achieve the effects of simple operation, good adsorption and complexation performance, and a wide range of applications

Inactive Publication Date: 2012-08-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of sewage water is extremely complex, often containing pollutants of different electrical properties

Method used

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  • Straw modified into amphiprotic adsorbent and preparation method thereof
  • Straw modified into amphiprotic adsorbent and preparation method thereof
  • Straw modified into amphiprotic adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The straw is dispersed in the mixed solution of isopropanol and sodium hydroxide, wherein the mass percent concentration of the sodium hydroxide aqueous solution is 40%, the mass ratio of the isopropanol to the sodium hydroxide solution is 65:35, and the mass percent of the straw The content is 5%, after stirring for 4 hours of alkalization reaction, dissolve CTA in isopropanol aqueous solution, wherein the mass ratio of isopropanol to water is 80:20, and the mass ratio of CTA to straw is 3:1, slowly drop Put it into the alkalized straw solution, and react for 12 hours at 35°C. Wash and dry. Take the above CTA modified straw product and disperse it in ethanol and sodium hydroxide mixed solution, wherein the concentration of sodium hydroxide aqueous solution is 5%, the mass ratio of ethanol and sodium hydroxide solution is 55:45, the mass percentage of CTA modified straw content of 5%, after stirring for 2 hours of alkalization reaction, dissolve chloroacetic acid in aq...

Embodiment 2

[0025]Disperse the straw in a mixed solution of isopropanol and sodium hydroxide, wherein the concentration of the aqueous sodium hydroxide solution is 10%, the mass ratio of isopropanol to the sodium hydroxide solution is 85:15, and the mass percentage of the straw is 20% , after stirring and alkalizing for 8 hours, CTA was dissolved in isopropanol aqueous solution, wherein the mass ratio of isopropanol to water was 85:15, and the mass ratio of CTA to straw was 5:1, and slowly added dropwise to the alkalized straw In the solution, react at 45°C for 1h. Wash and dry. Take the above CTA modified straw product and disperse it in ethanol and sodium hydroxide mixed solution, wherein the concentration of sodium hydroxide aqueous solution is 30%, the mass ratio of ethanol and sodium hydroxide solution is 15:85, the mass percentage of CTA modified straw content of 10%, after stirring and alkalizing for 9 hours, dissolve chloroacetic acid in aqueous ethanol solution, wherein the mass...

Embodiment 3

[0027] The straw is dispersed in a mixed solution of isopropanol and sodium hydroxide, wherein the concentration of the aqueous sodium hydroxide solution is 30%, the mass ratio of isopropanol to the sodium hydroxide solution is 45:55, and the mass percentage of the straw is 30%. , after stirring the alkalization reaction for 1 h, dissolve CTA in isopropanol aqueous solution, wherein the mass ratio of isopropanol to water is 45:55, and the mass ratio of CTA to straw is 0.1:1, and slowly add it dropwise to the alkalized straw In the solution, react at 60°C for 24h. Wash and dry. Take the above CTA modified straw product and disperse it in ethanol and sodium hydroxide mixed solution, wherein the concentration of sodium hydroxide aqueous solution is 20%, the mass ratio of ethanol and sodium hydroxide solution is 80:20, the mass percentage of CTA modified straw content of 1%, after stirring and alkalizing for 6 hours, dissolve chloroacetic acid in aqueous ethanol solution, wherein...

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Abstract

The invention discloses straw modified into an anionic and cationic amphiprotic adsorbent. A preparation method of the straw comprises the following steps of: reacting straw with 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride in an alkaline solution; grafting a straw containing 2-hydroxypropyl trimethyl ammonium chloride on a cellulose or lignin molecular chain of straw; reacting with chloroactic acid in an ethanol-water mixed solvent; and grafting an acetic acid group on the straw to form the straw modified into the anionic and cationic amphiprotic adsorbent. The straw modified into the anionic and cationic amphiprotic adsorbent is a biodegradable material, has the characteristics of low toxicity, freeness from secondary pollution and the like, and is an environmentally-friendly material; and the straw has the characteristics of anionic and cationic adsorbents, has high adsorbing and complexing performance on impurities in water bodies since a natural high molecular chain which is rich in a large amount of natural high molecular cellulose, lignin and the like is provided with a large quantity of active groups such as hydroxyl and the like, and has a wide sewage treatment application range. The invention discloses a preparation method of the straw.

Description

technical field [0001] The present invention relates to utilization of straw and anionic and cationic amphoteric adsorbents. Background technique [0002] Straw is a common agricultural waste in rural areas of our country, which has the characteristics of wide distribution and large resources. According to its chemical composition, straw is mainly composed of cellulose, hemicellulose and lignin, and also contains a small amount of ash that can be extracted by neutral solvents such as water, ethanol, benzene, or dilute acid and alkaline solutions, and extractable organic matter, etc. . Straw is not only an important by-product of crops, but also an important production resource for industrial and agricultural production. However, at present, the treatment of straw is still mainly in the traditional aspects of burning, returning to the field, and feeding. Among them, straw burning has attracted more and more attention in recent years. According to statistics, the world's a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30
Inventor 杨琥张文轩杨朕严涵李爱民
Owner NANJING UNIV