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Dendritic cellulose-based amphoteric flocculating-decolorizing agent and preparation method thereof

A cellulose-based, decolorizing agent technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor treatment effect, small application range, environmental and human hazards, etc., and achieve high flocculation decolorization efficiency and large capacity decolorization In addition, there is no effect of secondary pollution

Active Publication Date: 2016-05-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of narrow application range, poor treatment effect, and potential harm to the environment and human body in the prior art, the present invention provides a dendritic cellulose-based amphoteric flocculation decolorizer and a preparation method thereof, which have high flocculation efficiency and effective It is stable and environmentally friendly, and at the same time provides a new way for the high-value comprehensive utilization of cellulose renewable resources

Method used

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  • Dendritic cellulose-based amphoteric flocculating-decolorizing agent and preparation method thereof
  • Dendritic cellulose-based amphoteric flocculating-decolorizing agent and preparation method thereof
  • Dendritic cellulose-based amphoteric flocculating-decolorizing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Add 0.5 g of sodium carboxymethyl cellulose to 40 mL of distilled water, and stir magnetically at room temperature to obtain a uniform and transparent sodium carboxymethyl cellulose solution;

[0031] (2) Add 0.25 g of sodium periodate to the sodium carboxymethyl cellulose solution obtained in step (1) under magnetic stirring, and oxidize it at 35°C for 120 min; The mass ratio of sodium is 0.5:1, polyethyleneimine with a molecular weight of 600 is added, and the grafting reaction takes 120 minutes to obtain a uniform and transparent solution;

[0032] (3) The solution obtained in step (2) was added to 5 times the volume of absolute ethanol, and the mixture was centrifuged at 8000 rpm for 5 minutes to collect the precipitate, which was washed and dried by centrifugation to obtain a dendritic cellulose-based amphoteric flocculant.

[0033] The flocculation decolorizing agent prepared in this example forms a solution with a concentration of 2g / L, and presents different...

Embodiment 2

[0035] (1) Add 0.5 g of pulp pulp into 50 mL of distilled water, and stir magnetically at room temperature to obtain a uniformly dispersed cellulose suspension;

[0036] (2) Add 0.5g of sodium periodate to the cellulose suspension obtained in step (1) under magnetic stirring, and oxidize it for 120min at 50°C; then the mass ratio of polyethyleneimine to pulp is 1: 1. Add polyethyleneimine with a molecular weight of 3000 and graft for 150 minutes to obtain a uniform and transparent solution;

[0037] (3) The solution obtained in step (2) was added to 5 times the volume of absolute ethanol, and the mixture was centrifuged at 8000 rpm for 5 minutes to collect the precipitate, which was washed and dried by centrifugation to obtain a dendritic cellulose-based amphoteric flocculant.

[0038] The flocculation decolorizing agent prepared in this example forms a solution with a concentration of 2g / L, and presents different surface charge characteristics at different pHs, such as imag...

Embodiment 3

[0040] (1) Add 0.5 g of wood pulp into 60 mL of distilled water, and stir magnetically at room temperature to obtain a uniformly dispersed cellulose suspension;

[0041] (2) Add 0.5 g of sodium periodate into the cellulose suspension obtained in step (1) under the action of magnetic stirring, and oxidize it for 180 min at 50° C.; : 1, adding molecular weight is the polyethylenimine of 3500, grafting reaction 180min, obtains uniform cellulose suspension;

[0042] (3) The solution obtained in step (2) was added to 5 times the volume of absolute ethanol, and the mixture was centrifuged at 8000 rpm for 5 minutes to collect the precipitate, which was washed and dried by centrifugation to obtain a dendritic cellulose-based amphoteric flocculant.

[0043] The flocculation decolorizing agent prepared in this example forms a solution with a concentration of 2g / L, and presents different surface charge characteristics at different pHs, such as image 3 As shown, its Zeta potential range...

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Abstract

The invention discloses a dendritic cellulose-based amphoteric flocculating-decolorizing agent and a preparation method of the dendritic cellulose-based amphoteric flocculating-decolorizing agent. The dendritic cellulose-based amphoteric flocculating-decolorizing agent is characterized in that a cellulosic material is mainly taken as a molecular framework; the cellulosic material is oxidized into dialdehyde cellulose by utilization of sodium periodate; then an aldehyde group and an amino group are used to form a Schiff-base structure; the flocculating-decolorizing agent is formed by means of bonding and grafting polyethyleneimine; the cellulosic material, the sodium periodate and the polyethyleneimine are sequentially added for preparation by means of taking water as a solvent; the surface charge characteristic and active site of the flocculating-decolorizing agent are regulated by means of changing a mass ratio of the cellulosic material to the polyethyleneimine. The dendritic cellulose-based amphoteric flocculating-decolorizing agent has the advantages of high flocculation efficiency, stable effect, environmental friendliness, and efficient application in purification treatment of complex water body, such as papermaking, printing and dyeing, heavy metal containment and the like.

Description

technical field [0001] The invention relates to the technical field of water treatment engineering, in particular to a dendritic cellulose-based amphoteric flocculation decolorizer and a preparation method thereof. Background technique [0002] In recent years, with people's increasing attention to environmental issues, new technologies for environmental pollution treatment have been developed rapidly. Among them, the flocculation decolorization technology has the advantages of economy and high efficiency, especially in the removal of particulate matter, dyes, and heavy metals. [0003] At present, the commonly used flocculating decolorizing agents mainly include inorganic polymer flocculating decolorizing agents represented by aluminum salts and iron salts and organic polymer flocculating decolorizing agents represented by artificial chemically synthesized polyacrylamide. Although the price of inorganic flocculants is low, the flocs formed by them are small, the treatment ...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08G83/00
CPCC02F1/56C08G83/003
Inventor 姚菊明朱文静刘琳陈选
Owner ZHEJIANG SCI-TECH UNIV
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