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Composite type mercury ion adsorbent and preparation method thereof

An adsorbent, composite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc. Effect

Inactive Publication Date: 2012-05-02
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of adsorbent has a high adsorption capacity and strong adsorption selectivity for mercury ions, but the price of this kind of adsorbent is greatly restricted by the price of chitosan, and the cost is relatively high, so it is difficult to apply and promote in practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of chitosan-polyvinyl alcohol / 5% acidified bentonite mercury ion adsorbent:

[0031] a. The degree of deacetylation is 75%, and the molecular weight is 3×10 5 The chitosan with concentration is that the acetic acid solution of 1% is dissolved, is mixed with the chitosan solution that concentration is 2%;

[0032] b. Dissolving polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 99% with deionized water to prepare a 10% polyvinyl alcohol solution;

[0033] c, measure 700mL concentration of 2% chitosan solution and 60mL concentration of 10% polyvinyl alcohol solution, at room temperature, after high-speed mechanical stirring for 1h, add 1.00g of bentonite (particle diameter≤400mm) through sulfuric acid acidification treatment order), continue to stir at high speed for 3h, after fully mixing, slowly add 5.74mL of glutaraldehyde solution with a concentration of 25%, and continue to stir at room temperature for 4h;

[0034] ...

Embodiment 2

[0038] Preparation of chitosan-polyvinyl alcohol / 10% acidified bentonite mercury ion adsorbent:

[0039] a. The degree of deacetylation is 75%, and the molecular weight is 3×10 5 The chitosan with concentration is that the acetic acid solution of 1% is dissolved, is mixed with the chitosan solution that concentration is 2%;

[0040] b. Dissolving polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 99% with deionized water to prepare a 10% polyvinyl alcohol solution;

[0041] c, measure 700mL concentration of 2% chitosan solution and 60mL concentration of 10% polyvinyl alcohol solution, at room temperature, after high-speed mechanical stirring for 1h, add 2.00g of bentonite (particle diameter≤400mm) through sulfuric acid acidification treatment order), continue to stir at high speed for 3h, after fully mixing, slowly add 5.74mL of glutaraldehyde solution with a concentration of 25%, and continue to stir at room temperature for 4h;

[0042]...

Embodiment 3

[0046] Preparation of chitosan-polyvinyl alcohol / 15% acidified bentonite mercury ion adsorbent:

[0047] a. The degree of deacetylation is 75%, and the molecular weight is 3×10 5 The chitosan with concentration is that the acetic acid solution of 1% is dissolved, is mixed with the chitosan solution that concentration is 2%;

[0048] b. Dissolving polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 99% with deionized water to prepare a 10% polyvinyl alcohol solution;

[0049] c, measure 700mL concentration of 2% chitosan solution and 60mL concentration of 10% polyvinyl alcohol solution, at room temperature, after high-speed mechanical stirring for 1h, add 3.00g of bentonite (particle diameter≤400mm) through sulfuric acid acidification treatment order), continue to stir at high speed for 3h, after fully mixing, slowly add 5.74mL of glutaraldehyde solution with a concentration of 25%, and continue to stir at room temperature for 4h;

[0050]...

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Abstract

The invention relates to a composite type mercury ion adsorbent and a preparation method thereof. The adsorbent consists of chitosan, polyvinyl alcohol and clay. A polyvinyl alcohol macromolecular chain and a chitosan macromolecular chain are penetrated and wound mutually by high-speed stirring, so that the inorganic clay is dispersed fully; and the release of the chitosan and the polyvinyl alcohol in the process of using the adsorbent is avoided effectively by a method of combining cross linking agent cross linking and freezing crossing linking of glutaraldehyde. The adsorbent has high adsorption capacity and high adsorptive selectivity on Hg(II) ions, hardly adsorbs Cd(II) and Pb(II) ions, and adsorbs a small amount of Cu(II) ions, and can be recycled, and adsorbability of the adsorbentis slightly influenced by the pH value of a solution. The integral preparation process is performed in an aqueous solution, the preparation method is simple and convenient, low in energy consumption,low in production cost, environment-friendly, and easy to industrialize, and special process equipment is avoided.

Description

technical field [0001] The invention relates to a low-cost, high-efficiency, high-selectivity composite mercury ion adsorbent and a preparation method thereof, in particular to a chitosan-polyvinyl alcohol formed by copolymerizing polyvinyl alcohol, chitosan and clay The preparation method of / clay composite mercury ion adsorbent. Background technique [0002] Mercury and its derivatives have the characteristics of persistence, easy migration, bioaccumulation, and biotoxicity. They are important environmental toxic and harmful substances, which pose a huge threat to human health and the ecological environment. Mercury and its compounds can spread globally through the atmosphere, water, soil, and biological chains. Therefore, it has been listed as a global pollutant by the United Nations Environment Program and has become one of the priority pollutants in China and the world. [0003] Combustion of fossil fuels and waste gas, waste water and waste emissions from mercury-using...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 王晓焕王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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