Efficient composite heavy metal chelating agent

Abstract

The invention relates to an efficient composite heavy metal chelating agent and a preparation method thereof. The efficient composite heavy metal chelating agent comprises the components in percentage by mass as follows: 35%-40% of nanometer aluminum oxide, 15%-20% of ethylene diamine tetraacetic acid and 40%-60% of sodium carboxymethyl starch. The efficient composite heavy metal chelating agent is non-toxic and has no harm to aquatic lives, pH value is not required to be adjusted when heavy metal wastewater is treated, and the treatment effect is superior to that of a traditional heavy metal treatment method.

Description

technical field [0001] The invention belongs to the technical field of removing, purifying or trapping heavy metal ions in water bodies, and in particular relates to a heavy metal chelating agent and a preparation method thereof. Background technique [0002] Heavy metal pollution refers to the environmental pollution caused by elements with significant biological toxicity such as Hg, Cd, Pb, Cr and As, and general heavy metals with certain toxicity, such as Zn, Cu, Co, Ni, Sn and their compounds. It has the following characteristics: ① A small amount can produce significant toxic effects. Generally, heavy metals can produce toxic effects in the range of 1.0-10 mg / L, and the range of significant toxicity is 0.001-0.1 mg / L; ② cannot be degraded by microorganisms. On the contrary, some heavy metals Under the action of microorganisms, it will be transformed into more toxic metal-organic substances, such as mercury into alkylmercury; ③ After being ingested by organisms, it will ...

AI Technical Summary

Problems solved by technology

However, in practical application, this type of heavy metal trapping agent has the following disadvantages: First, it is toxic and harmful to aquatic organisms

Second, due to the partial vacancy of the chelating group and other reasons, it is necessary to use an excessive amount of heavy metal scavenger several times to make the heavy metal ions in the wastewater reach the standard, resulting in the treated wastewater containing a certain concentration of heavy metal scavenger, causing damage to the environment and causing The water color is yellowish