Hyperbranched polyamide modified chitosan quaternary ammonium salt microsphere for wastewater treatment and preparation method and application thereof

A technology of hyperbranched polyamide, chitosan quaternary ammonium salt, applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc. problem, to achieve the effect of good removal capacity, good adsorption removal, and good adsorption effect

Active Publication Date: 2016-06-15
ZHANJIANG JIALI GLOVE PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic flocculants commonly used in water treatment are usually iron salts and aluminum salts. However, such flocculants have low effectiveness and large dosage, which may easily cause secondary pollution. For example, the residue of iron-based inorganic flocculants directly deteriorates water quality. ; senile dementia is related to aluminum-containing inorganic flocculants widely used now; while the monomer (acrylamide) of organic polymer flocculants is a direct carcinogen, teratogenic and mutagenic agent, and has strong neurotoxicity. Carryover during polymerization is a serious concern
In addition, polyacrylamide is difficult to be degraded by microorganisms in the natural environment, which has formed long-term or even permanent potential harm to humans.

Method used

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  • Hyperbranched polyamide modified chitosan quaternary ammonium salt microsphere for wastewater treatment and preparation method and application thereof
  • Hyperbranched polyamide modified chitosan quaternary ammonium salt microsphere for wastewater treatment and preparation method and application thereof
  • Hyperbranched polyamide modified chitosan quaternary ammonium salt microsphere for wastewater treatment and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1: the preparation of hyperbranched polyamide modified chitosan quaternary ammonium salt of the present invention is as follows:

[0057] Add 1g chitosan into 10mL N,N-dimethylacetamide, stir and swell at room temperature for 24h.

[0058] Dissolve 1.65g of trimesoyl chloride and 0.1875g of lithium chloride in 15mL of dry solvent N,N-dimethylacetamide in a three-necked flask equipped with an ice-water bath, a nitrogen inlet and outlet, and a magnet, and stir to make Fully dissolve for 0.5h, then add 0.5mL of acid-binding agent pyridine and 0.186g of ethylenediamine under ice bath conditions, stir the heterogeneous solution for 2h, remove from the ice bath and place in 35 o C conditions for 14h. After the reaction is over, add the hyperbranched polyamide generated by the reaction into the swollen chitosan at room temperature, react at room temperature for 24 hours, then add excess methyl iodide for reaction, react in the dark for 24 hours, discharge the mater...

Embodiment 2

[0063] Acetic acid aqueous solution: 2% (v / v, volume percentage concentration)

[0064] 0.8% (w / v%) hyperbranched polyamide modified chitosan quaternary ammonium salt solution: 10mL

[0065] Xylene 60mL

[0066] Tween85 (emulsifier) ​​3.6mL (6% of the volume of liquid paraffin)

[0067] Succindialdehyde (crosslinking agent) 0.4g

[0068] Emulsification time 4h

[0069] Cross-linking time 4h

[0070] temperature 50°C

[0071] Preparation Process:

[0072] In a 250mL three-necked flask, add 60mL of xylene, add 3mL of Tween85 to it while stirring, stir for 5min, heat up to 50°C, add dropwise 10mL of 0.8% (w / v%) to the three-necked flask prepared in Example 1 The hyperbranched polyamide-modified chitosan solution was emulsified at 400rpm for 4 hours to prepare a W / O type inverse microemulsion. Then 0.4 g of succinaldehyde was added dropwise, and the cross-linking solidified for 4 hours, and then cooled to room temperature. The product was divided into a centrifuge tube and...

Embodiment 3

[0074] Acetic acid aqueous solution: 4.1% (v / v, ratio of acetic acid to water)

[0075] 1.3% (w / v) hyperbranched polyamide modified chitosan quaternary ammonium salt solution: 10mL

[0076] Cyclohexane: 60mL

[0077] Acrolein F-98 (emulsifier): 1.8mL (3% by volume of cyclohexane)

[0078] 2,7-Dimethyl-3-formyl-suberaldehyde (crosslinking agent): 0.8g

[0079] Emulsification time: 4h

[0080] Cross-linking time: 5h

[0081] Temperature: 50°C

[0082] Preparation Process:

[0083] In a 250mL three-necked flask, add 60mL of cyclohexane, add 1.8mL of emulsifier F-98 to it while stirring, stir for 5min, raise the temperature to 50°C, add dropwise 10mL of 1.3% (w / v ) Modified chitosan quaternary ammonium salt solution, emulsified at 400rpm for 4h to prepare a W / O type inverse microemulsion. Then 0.8 g of 2,7-dimethyl-3-formyl-suberaldehyde was added dropwise, cross-linked and solidified for 5 hours, and then cooled to room temperature. The product was placed in a centrifuge ...

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Abstract

The invention provides hyperbranched polyamide modified chitosan quaternary ammonium salt which is obtained through the reaction of hyperbranched polyamide, chitosan and alkyl halide.The hyperbranched polyamide is prepared from trimesoyl chloride and ethylenediamine through a solution polymerization method.The alkyl halide comprises methyl iodide, ethyl iodide, methyl bromide or ethyl bromide.The microsphere prepared from the quaternary ammonium salt is applied to treatment of methyl orange wastewater, the final dye removal rate can reach 99.67%, the microsphere is renewable, and the preparation process is simple and free of pollution.

Description

technical field [0001] The invention belongs to the technical field of modification and preparation of chitosan, and more specifically relates to hyperbranched polyamide modified chitosan quaternary ammonium salt microspheres for wastewater treatment and a preparation method and application thereof. Background technique [0002] At present, my country's water environment pollution is increasing, and the situation is very serious; surface water has entered the eutrophication stage, drinking water safety is threatened, water pollution and water source crisis have become important issues related to the national economy and people's livelihood. With the enhancement of people's awareness of environmental protection and the implementation of my country's sustainable development strategy, focusing on the prevention and control of water pollution, strengthening the work of industrial sewage and urban domestic sewage treatment has attracted great attention from governments at all leve...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G69/26C08G69/28C08J3/24C08J3/16C08L87/00B01J20/26B01J20/28C02F1/28
CPCB01J20/267B01J20/28019C02F1/288C02F2101/308C08G69/26C08G69/28C08G81/00C08J3/16C08J3/24C08J2387/00
Inventor 冯宗财汪德凤宋秀美何大民
Owner ZHANJIANG JIALI GLOVE PRODS
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