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Method for preparing nanometer composite gel for removing bivalent cadmium in wastewater

A nanocomposite, waste water technology, applied in the direction of gel preparation, chemical instruments and methods, water pollutants, etc., can solve the problem that environmentally friendly selective adsorption gels are not used and developed by large-scale industries, and there is not enough foundation and technology Support and other issues

Active Publication Date: 2018-04-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since heavy metal adsorption gels mainly rely on synthetic or semi-synthetic polymers, there is not enough foundation and technical support for the development of gels based on all-natural materials. Therefore, environmentally friendly and selective adsorption gels are still Unscaled industrial utilization and development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: prepare the method for removing the nanocomposite gel of divalent cadmium in waste water, concrete operation is as follows:

[0019] (1) Dispersion process of clinoptilolite

[0020] Weigh 0.1 mg of clinoptilolite powder, add 1 mL of deionized water to prepare a clinoptilolite dispersion with a concentration of 0.1 mg / mL, put it in an ice-water bath, and use an ultrasonic generator to sonicate at a power of 500 W for 0.5 h to make Clinoptilolite is uniformly dispersed in deionized water;

[0021] (2) Realization process of composite hydrogel

[0022] Dissolve 1 g of hydroxyethyl chitosan in 100 mL of deionized water to prepare a hydroxyethyl chitosan solution with a concentration of 0.01 g / mL, then add clinoptilolite dispersion to the hydroxyethyl chitosan solution successively, and pass Potassium sulfate 0.05g and N,N-methylene bisacrylamide 0.03g, dissolve and mix well, then pass through nitrogen, after 10min, add 0.5g acrylamide, carry out graft copol...

Embodiment 2

[0029] Embodiment 2: prepare the method for removing the nanocomposite gel of divalent cadmium in waste water, concrete operation is as follows:

[0030] (1) Dispersion process of clinoptilolite

[0031] Weigh 10 mg of clinoptilolite powder, add 1 mL of deionized water to prepare a clinoptilolite dispersion with a concentration of 10 mg / mL, put it in an ice-water bath, and use an ultrasonic generator to ultrasonicate for 5 h at a power of 2000 W to make the clinoptilolite Uniformly dispersed in deionized water;

[0032] (2) Realization process of composite hydrogel

[0033] Dissolve 1 g of hydroxyethyl chitosan in 10 mL of deionized water to prepare a hydroxyethyl chitosan solution with a concentration of 0.1 g / mL, then add clinoptilolite dispersion, Potassium sulfate 0.5g and N,N-methylenebisacrylamide 0.1g, dissolve and mix well, then pass through nitrogen, after 30min, add 5g of acrylamide, carry out graft copolymerization reaction at 60°C for 10h , wherein the volume ra...

Embodiment 3

[0040] Embodiment 3: prepare the method for removing the nanocomposite gel of divalent cadmium in waste water, concrete operation is as follows:

[0041] (1) Dispersion process of clinoptilolite

[0042] Weigh 5 mg of clinoptilolite powder, add 1 mL of deionized water to prepare a clinoptilolite dispersion with a concentration of 5 mg / mL, put it in an ice-water bath, and use an ultrasonic generator to ultrasonicate for 2.5 h at a power of 1500 W to make the clinoptilolite dispersion Zeolite is evenly dispersed in deionized water;

[0043] (2) Realization process of composite hydrogel

[0044] Dissolve 1 g of hydroxyethyl chitosan in 20 mL of deionized water to prepare a hydroxyethyl chitosan solution with a concentration of 0.05 g / mL, then add 1 mL of clinoptilolite dispersion to the hydroxyethyl chitosan solution successively, Potassium persulfate 0.25g and N,N-methylenebisacrylamide 0.05g, dissolve and mix well, then pass through nitrogen, after nitrogen flow for 15min, ad...

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Abstract

The invention discloses a method for preparing a nanometer composite gel for removing bivalent cadmium in wastewater. The method comprises the following steps of using hydroxyethyl chitosan and clinoptilolite as raw materials; grafting acrylamide onto macromolecules of the hydroxyethyl chitosan through free radical grafting polymerizing reaction, and mixing with the clinoptilolite; cleaning a product, and drying; performing ball milling and grinding, so as to obtain the nanometer-level clinoptilolite / hydroxyethyl chitosan-grafted copolymer composite gel. A nanometer composite gel absorbent prepared by the method has the advantages that the nanometer composite gel absorbent is a grey white powder, the bivalent cadmium ion in the wastewater can be removed at high efficiency, the pollution toenvironment is avoided, and the green and environment-friendly effects are realized; the comprehensive utilization efficiency of natural macromolecules of chitosan derivative, clinoptilolite and thelike can be improved, a feasible program is provided for the high-efficiency adsorption and removal of the Cd<2+> in heavy metal wastewater, and the application prospect is broader.

Description

technical field [0001] The invention relates to a method for preparing selective adsorption of divalent cadmium ions (Cr 2+ ) The method of clinoptilolite / hydroxyethyl chitosan graft copolymer nanocomposite gel belongs to the technical field of natural polymer modified materials. Background technique [0002] With the rapid development of industry, a large amount of wastewater containing many potentially toxic metals is released into the surface and groundwater, and the problem of water pollution has attracted increasing attention. Among these industries, the mining and metallurgical industries play a major role in water pollution. They not only directly discharge waste liquid containing heavy metal ions into the river system, but also discard untreated solid waste containing residual metals into the environment. thing. Solid waste such as slag is dumped in the environment, and heavy metal ions will continue to migrate to surface water and groundwater over time. Some heav...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F2/44C08K7/26B01J13/00C02F1/28
CPCB01J13/0065B01J13/0069C02F1/281C02F1/285C08F2/44C08F251/00C08K7/26C02F2101/20C08K2201/011C08F220/56
Inventor 韩全青高欣
Owner KUNMING UNIV OF SCI & TECH
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