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Method for preparing high-adsorption nano-crystalline cellulose polyvinylamine microgel by using biomass

A polyvinylamine microgel and nanocellulose technology, which is applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve problems such as unsatisfactory adsorption effects, achieve large specific surface area, Good development prospects, easy to reuse the effect

Inactive Publication Date: 2015-11-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its adsorption functional groups are hydroxyl and carboxyl groups on the surface, and the adsorption effect on cationic dyes is better, but the adsorption effect on anionic dyes widely used in industry is not satisfactory.

Method used

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  • Method for preparing high-adsorption nano-crystalline cellulose polyvinylamine microgel by using biomass
  • Method for preparing high-adsorption nano-crystalline cellulose polyvinylamine microgel by using biomass
  • Method for preparing high-adsorption nano-crystalline cellulose polyvinylamine microgel by using biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Pulverize the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take as 20 g of dry pulp. Add 170mL of sulfuric acid with a mass concentration of 64% at 45°C and mix, and react under the action of mechanical stirring. After reacting for 30min, the suspension is diluted 10 times with deionized water to terminate the reaction. The product was centrifuged repeatedly with deionized water until the pH value was 5.0. Put the precipitate after centrifugation into a dialysis bag with a molecular weight cut off of 12000-14000, and dialyze with flowing deionized water for 5 days. The dialyzed suspension was treated with an ultrasonic oscillator for 10 minutes. In order to avoid product aggregation due to heat, the ultrasonic treatment was carried out in an ice-water bath to obtain a nanocrystalline cellulose (NCC) suspension.

[0040] (2) Take the NCC suspension containing 1 g of dry material, add 6 mmol of sodium periodate, adjust the pH to 3.5 wit...

Embodiment 2

[0045] (1) Pulverize the bleached hardwood pulp with a pulverizer, pass through a 20-mesh sieve, and take as 20 g of dry pulp. Add 170ml of sulfuric acid with a mass concentration of 64% at 45°C and mix, react under mechanical stirring for 30min, and then dilute the suspension 10 times with deionized water to terminate the reaction. The product was centrifuged repeatedly with deionized water until the pH value was 5.0. Put the precipitate after centrifugation into a dialysis bag with a molecular weight cut off of 12000-14000, and dialyze with flowing deionized water for 5 days. The dialyzed suspension was treated with an ultrasonic oscillator for 10 minutes. In order to avoid product aggregation due to heat, the treatment was carried out in an ice-water bath to obtain a nano-microcrystalline cellulose suspension.

[0046] (2) Take the NCC suspension containing 1 g of dry material, add 9 mmol of sodium periodate, adjust the pH to 3.5 with 0.5 mol / L sulfuric acid, and dilute to...

Embodiment 3

[0049] (1) Pulverize the bleached coniferous wood pulp with a pulverizer, pass through a 20-mesh sieve, and take as 20 g of dry pulp. Add 170ml of sulfuric acid with a mass concentration of 64% at 45°C and mix, and react under the action of mechanical stirring. After reacting for 30 minutes, dilute the suspension 10 times with deionized water to terminate the reaction. The product was centrifuged repeatedly with deionized water until the pH value was 5.0. Put the precipitate after centrifugation into a dialysis bag with a molecular weight cut off of 12000-14000, and dialyze with flowing deionized water for 5 days. The dialyzed suspension was treated with an ultrasonic oscillator for 10 minutes. In order to avoid product aggregation due to heat, the treatment was carried out in an ice-water bath to obtain a nano-microcrystalline cellulose suspension.

[0050] (2) Take the NCC suspension containing 1 g of dry material, add 12 mmol of sodium periodate, adjust the pH to 3.5 with ...

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Abstract

The invention relates to a method for preparing a high-adsorption nano-crystalline cellulose polyvinylamine microgel by using a biomass. The method comprises the steps of acid-treating lignocellulosic materials, and performing ultrasonic treatment to obtain nano microcrystalline cellulose colloidal suspension liquid; adding periodate in the nano microcrystalline cellulose colloidal suspension liquid, adjusting pH to be 3 to 4, and reacting under a dark condition, thus obtaining a dialdehyde nano microcrystalline cellulose; dropwise adding the dialdehyde nano microcrystalline cellulose into polyvinylamine, and stirring for reacting, thus obtaining the nano-crystalline cellulose polyvinylamine microgel. The nano-crystalline cellulose polyvinylamine microgel consists of microsphere particles with the particle size of 200 to 300 nm, has a greater specific surface area, contains a great amount of free amino groups on the surface, is used for adsorbing an anionic dye and heavy metal ions in wastewater, and has higher adsorption capacity.

Description

technical field [0001] The invention relates to a method for preparing high-adsorption nano-cellulose polyvinylamine microgel by utilizing biomass, and belongs to the technical field of adsorption materials. Background technique [0002] In recent years, textile, printing, printing and dyeing, papermaking and other industries have developed rapidly, but the wastewater discharged contains a large amount of dyes and metal ions, which seriously affects the quality of water in nature and human health, and also brings harm to the natural environment. Enormous pressure. Therefore, the treatment of dyes and metal ions in industrial wastewater has become an urgent problem to be solved. Compared with coagulation, ion exchange, oxidation, chemical precipitation, electrodeposition and membrane treatment, adsorption is a superior method for treating dyes and dyes in wastewater with high removal efficiency, easy operation, low cost and no by-products method of heavy metal ions. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F101/22
Inventor 徐清华孙秋存靳丽强陈浩
Owner QILU UNIV OF TECH
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