Novel chelating heavy metal capturing agent, and synthesis method and application thereof

Abstract

The invention relates to a novel chelating heavy metal capturing agent, and a synthesis method and application thereof. The technical scheme is characterized in that a polymer main chain polyhydroxyethyl acrylamide, a functional polymer side chain precursor polymer carboxyl-terminated poly(N-vinylformamide), water, a catalyst N-hydroxysuccinimide, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide methiodide, potassium hydroxide, ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid dianhydride and carbon disulfide are employed for prepare the novel chelating heavy metal capturing agent, and the novel chelating heavy metal capturing agent is used to treat heavy metal wastewater discharged from electroplating, smelting, mining, beneficiation, chemical engineering and machinery. The functional group of the capturing agent can adsorb complexed heavy metal ions, and each basic unit can provide six coordination atoms for strong chelation and adsorption. Further, a chemical precipitation reaction between sodium dithiocarbamate at the side chain and a sedimentation aid is facilitated through a polymer brush, and a large aggregate is generated in seconds, so that rapid settling is realized and the operation is simple.

Description

technical field [0001] The invention belongs to the field of water treatment technology and polymer functional materials, and in particular relates to a novel chelated heavy metal scavenger and a synthesis method and application thereof; the invention mainly discharges heavy metals in electroplating, smelting, mining, mineral processing, chemical industry and machinery, etc. Wastewater industry applications. Background technique [0002] Heavy metal wastewater mainly comes from electroplating, smelting, mining, mineral processing, chemical and machinery industries. After the wastewater containing heavy metals produced by these industries is discharged into natural water bodies, it not only poses a threat to aquatic organisms, but also may be continuously enriched in organisms through the food chain, and ultimately endanger human health. The traditional methods of heavy metal wastewater treatment mainly include chemical precipitation method, heavy metal scavenger precipitati...

AI Technical Summary

Problems solved by technology

The Chinese patent discloses the invention patent application of "a polymer of polyethylene diamine tetraacetic acid unit". ; but there are some technical defects: (1) Most complex electroplating wastewater is acidic wastewater, which cannot be added directly, and the pH value needs to be adjusted to neutral to alkaline to effectively settle; (2) Under alkaline conditions , the feeding ratio of the new heavy metal scavenger is difficult to control, and excessive feeding will easily lead to slow precipitation or no precipitation and anti-dissolution; (3) The chelating ability of the new heavy metal scavenger is average, and each unit chemical structure can only provide 3 ingredients. Bit atoms participate in the chelation reaction, which is not effective for the treatment of highly complexed heavy metal wastewater

[0005] In short, the sedimentation rate of existing heavy metal scavenger is usually affected by factors such as functional groups, feed ratio, pH, etc.

The factor of feeding ratio is the most difficult to control. Excessive feeding will easily lead to slow sedimentation rate, and less feeding will easily lead to incomplete precipitation of heavy metals.