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Composite hydrogel for adsorption of heavy metal ions and preparation method thereof

A technology of composite hydrogel and heavy metal adsorption, which is applied in the directions of alkali metal compounds, adsorption water/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult advanced treatment of low-concentration heavy metal wastewater, low adsorption capacity, poor selectivity, etc. , to achieve the effect of excellent heavy metal adsorption capacity, large adsorption capacity and stable performance

Active Publication Date: 2014-12-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used adsorbents have problems such as low adsorption capacity, poor selectivity, and low efficiency.
It is difficult to achieve advanced treatment of low-concentration heavy metal wastewater

Method used

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  • Composite hydrogel for adsorption of heavy metal ions and preparation method thereof
  • Composite hydrogel for adsorption of heavy metal ions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method for a composite hydrogel adsorbing heavy metal ions, comprising the steps of:

[0043] (1) Add 2 g of polyvinyl alcohol (Sinopec Sichuan Vinylon Factory, 1799), 0.26 g of sodium alginate (Qingdao Xiangyu Seaweed Co., Ltd.) and 5 mL of deionized water into a three-necked flask, heat in a boiling water bath, and mechanically stir for 2 h mix it completely;

[0044] (2) Heat the mixed solution obtained in step (1) in a water bath at 80° C., then add 2 g of chitosan (Hangzhou Fuli Biotechnology Co., Ltd.), and mechanically stir for 6 hours to make the mixed solution evenly mixed;

[0045] (3) After the mixed solution obtained in step (2) is cooled to room temperature, a modified graphene oxide aqueous solution containing 0.01 g of modified graphene oxide is added to the mixed solution, ultrasonically dispersed for 0.2 h, and then mechanically stirred for 2 h to make the modified Graphene oxide is evenly dispersed;

[0046] (4) Use a syringe to drop th...

Embodiment 2

[0049] A preparation method for a composite hydrogel adsorbing heavy metal ions, comprising the steps of:

[0050] (1) Add 2 g of polyvinyl alcohol (Sinopec Sichuan Vinylon Factory, 1799), 0.26 g of sodium alginate (Qingdao Xiangyu Seaweed Co., Ltd.) and 5 mL of deionized water into a three-necked flask, heat in a boiling water bath, and mechanically stir for 2 h mix it completely;

[0051] (2) Heat the mixed solution obtained in step (1) in a water bath at 80° C., then add 2 g of chitosan (Hangzhou Fuli Biotechnology Co., Ltd.), and mechanically stir for 6 hours to make the mixed solution evenly mixed;

[0052] (3) After the mixed solution obtained in step (2) is cooled to room temperature, a modified graphene oxide aqueous solution containing 0.01 g of modified graphene oxide is added to the mixed solution, ultrasonically dispersed for 0.2 h, and then mechanically stirred for 2 h to make the modified Graphene oxide is evenly dispersed;

[0053] (4) Use a syringe to drop th...

Embodiment 3

[0056] A preparation method for a composite hydrogel adsorbing heavy metal ions, comprising the steps of:

[0057] (1) Add 2 g of polyvinyl alcohol (Sinopec Sichuan Vinylon Factory, 1799), 0.26 g of sodium alginate (Qingdao Xiangyu Seaweed Co., Ltd.) and 5 mL of deionized water into a three-necked flask, heat in a boiling water bath, and mechanically stir for 2 h mix it completely;

[0058] (2) Heat the mixed solution obtained in step (1) in a water bath at 80° C., then add 2 g of chitosan (Hangzhou Fuli Biotechnology Co., Ltd.), and mechanically stir for 6 hours to make the mixed solution evenly mixed;

[0059] (3) After the mixed solution obtained in step (2) is cooled to room temperature, a modified graphene oxide aqueous solution containing 0.01 g of modified graphene oxide is added to the mixed solution, ultrasonically dispersed for 0.2 h, and then mechanically stirred for 2 h to make the modified Graphene oxide is evenly dispersed;

[0060] (4) Use a syringe to drop th...

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Abstract

The invention discloses composite hydrogel for adsorption of metal ions and a preparation method thereof. The hydrogel comprises, by weight, 5-95 parts of polyvinyl alcohol, 5-95 parts of chitosan, 0.1-20 parts of modified graphene oxide and 2-6 parts of sodium alginate, the weight ratio between the polyvinyl alcohol and the chitosan is (5: 95)-(95: 5), modified graphite oxide includes modified graphene oxide modified by dopamine and / or modified graphene oxide modified by ferroferric oxide, all components are uniformly mixed in a certain sequence, and the composite hydrogel is obtained under special conditions. The composite hydrogel for adsorption of the heavy metal ions and the preparation method thereof have the advantages that high speed, high efficiency, high adsorption capacity and high selectivity are achieved, the adsorption effect on the heavy metal ions is remarkable, meanwhile, the preparation process is simple, and the operability is high.

Description

technical field [0001] The invention relates to the technical field of composite hydrogel for industrial heavy metal sewage treatment, in particular to a composite hydrogel prepared by using modified graphene oxide as a raw material and its application in the field of heavy metal adsorption. Background technique [0002] Heavy metals can cause harm to the water environment and the entire ecosystem through water accumulation and other ways, and can endanger human health through direct contact or through the food chain. In recent years, the problem of heavy metal pollution has become increasingly serious, such as the cadmium pollution incident in Guangxi, the blood lead incident in Jiangsu, and the lead poisoning incident in Shaanxi. Therefore, the removal of heavy metals in water is very important. How to quickly and efficiently remove heavy metal ions in water has become a research field for water pollution control. major issues. [0003] At present, the treatment methods o...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 东为富李鲁中陈明清马丕明李开武黄玉豪金剑秋胡砚磊傅梦婕
Owner JIANGNAN UNIV
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