Heavy metal trapping agent

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...

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