Heavy metal trapping agent

A heavy metal scavenger, polymer technology, used in flocculation/sedimentation water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. and soil cannot pass the leaching experiment and other problems to achieve the effect of strengthening synergy, improving treatment effect and reducing treatment cost.

Active Publication Date: 2017-07-28
ZEROWASTE ASIA PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although EDTA can form stable chelates with heavy metals, the obtained chelates are usually soluble and cannot be removed from wastewater by precipitation
And in the treatment of solid waste and soil, although ethylenediaminetetraacetic acid can chelate heavy metals, the formed chelate is soluble, so that the treated waste and soil cannot pass the leaching test, and it is difficult to reach landfill or land. use standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The heavy metal scavenger of this example is mainly composed of polymers containing polyethylenediaminetetraacetic acid units. The content of polyethylenediaminetetraacetic acid units is 80% to 100% of the polymer in terms of mass percentage. The structural formula of the acetic acid unit is as follows:

[0030]

[0031] In the formula, n is 10-100; it is a polymer of small molecules; it can be a homopolymer or a copolymer.

[0032] Its preparation method of the polymer containing polyethylene diamine tetraacetic acid unit is as follows:

[0033] Based on the polymer containing polyethylene diamine units, the amine group is diacetated through functional group reaction to prepare the polymer containing polyethylene diamine tetraacetic acid units.

[0034] Specifically: dissolve the polymer containing polyethylene diamine units in dilute hydrochloric acid solution, then drop excess sodium chloroacetate solution into the polymer solution containing polyethylene diamine...

Embodiment 2

[0039] The heavy metal scavenger of this example is a polymer of medium molecular weight, except that n is 100-1000, the others are the same as the first embodiment.

Embodiment 3

[0041] The heavy metal scavenger of this example is a macromolecular polymer, n is 1000~10000, and the specific preparation method is:

[0042] Dissolve the polymer containing polyethylene diamine units in water, then add sodium hydroxide that is 2 to 5 times the molar number of amino groups in the polymer containing polyethylene diamine units, stir and mix, then heat up to 65 to 95 degrees Celsius, Then slowly add excess hydroxyacetonitrile solution under stirring, after the addition, raise the temperature to 100-120 degrees Celsius, and keep it warm for 0.5-2 hours; after the reaction, add an appropriate amount of hydrogen peroxide solution to remove the remaining hydroxyacetonitrile, and then add activated carbon for decolorization; Acidify the decolorized reaction solution with hydrochloric acid to precipitate a white solid, filter, wash with water, and dry to obtain a polymer containing polyethylenediaminetetraacetic acid units.

[0043] The reaction equation is as follow...

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PUM

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Abstract

The invention relates to a heavy metal trapping agent in the field of environment protection. The heavy metal trapping agent is prepared from polymer containing a polyethylene diamine tetra-acetic acid unit, wherein by weight percentage, the content of the polyethylene diamine tetra-acetic acid unit is 45-100% of polymer; the polymer is homopolymer or copolymer; the polyethylene diamine tetra-acetic acid unit is a form of sodium salt, potassium salt or ammonium salt. The defect that a chelate compound of existing ethylenediamine tetra-acetic acid and the heavy metal is generally soluble is overcome, and the provided heavy metal trapping agent has strong heavy metal chelating power, and the solubility can be controlled by pH of the solution; moreover, the trapping agent is free of toxicity.

Description

[0001] Technical field [0002] The invention relates to the field of environmental protection, in particular to a heavy metal scavenger. Background technique [0003] Ethylenediaminetetraacetic acid, often abbreviated as EDTA, is a very effective heavy metal chelating agent. The four acid and two amine parts of ethylenediaminetetraacetic acid can be used as the teeth of the ligand. It is a hexadentate ligand that can be combined with mercury (II), lead (II), cadmium (II), nickel (II ), Zinc (II), Chromium (III), Manganese (II), Copper (II), Iron (III), Cobalt (II) and Silver (I) and other heavy metal ions to form a stable chelation thing. However, although EDTA can form stable chelates with heavy metals, the obtained chelates are usually soluble and cannot be removed from wastewater by precipitation. And in the treatment of solid waste and soil, although ethylenediaminetetraacetic acid can chelate heavy metals, the formed chelate is soluble, so that the treated waste and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08F126/02C08F8/00C02F101/20
CPCC02F1/56C02F2101/20C08F8/00C08F126/02
Inventor 葛利丫孙晓龙杨为中
Owner ZEROWASTE ASIA PTE LTD
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