Ultrafast sedimentation type molecular brush structure heavy metal scavenger and its preparation method and application

Abstract

The invention relates to an ultra-fast sedimentation type molecular brush structure heavy metal scavenger and a preparation method and application thereof. The ultra-fast sedimentation type molecularbrush structure heavy metal scavenger is characterized by being prepared from poly hydroxyethyl acrylamide as a polymer main chain, poly N-vinylformamide as a functional polymer side chain precursor polymer with a terminal end containing a carboxyl group, water, N-hydroxysuccinimide as a catalyst, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide iodomethane salt, potassium hydroxide, 1,2-cyclohexanediaminetetraacetic dianhydride and carbon disulfide, and can be used to treat wastewater produced by electroplating, smelting, mining, beneficiation, chemical, mechanical and other industries. A new chelating functional group can adsorb complexing heavy metal ions. Each basic unit can provide a hexacoordinate atom for strong chelation and adsorption, by chemical precipitation reaction of sodium dithiocarbamate of a sedimentation aid side chain and a sedimentation aid agent, large aggregates can be formed in a few seconds, rapid settling can be achieved, and the ultra-fast sedimentation type molecular brush structure heavy metal scavenger has efficient trapping and settling properties.

Description

technical field [0001] The invention belongs to the field of water treatment technology and polymer functional materials, and specifically relates to an ultra-fast sedimentation type molecular brush structure heavy metal scavenger and its preparation method and application, mainly used for electroplating, smelting, mining, mineral processing, chemical industry and machinery Wastewater from other industries. Background technique [0002] Heavy metal wastewater mainly comes from electroplating, smelting, mining, mineral processing, chemical and machinery industries. When wastewater containing heavy metals 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, eventually endangering human health. Traditional methods of heavy metal wastewater treatment mainly include chemical precipitation, heavy metal scavenger precipitation, ion exchange, activated carbon adsorption, ...

AI Technical Summary

Problems solved by technology

[0004] In recent years, new heavy metal scavenger has become a research hotspot. The publication number is CN 106986432A, and the invention name is "a polymer of polyethylene diamine tetraacetic acid unit". It has good heavy metal chelating ability and can be widely used in various Heavy metal wastewater industry and soil remediation; however, the new heavy metal scavenger prepared by this patent application still has some technical defects: (1) Most complex electroplating wastewater is acidic wastewater, which cannot be directly added and used, and the pH value needs to be adjusted to neutral Effective sedimentation can only occur when it is alkaline; (2) Under alkaline conditions, the feeding ratio of the new heavy metal scavenger is difficult to control, and excessive feeding will easily cause slow precipitation or no precipitation and reverse dissolution; (3) The new heavy metal scavenger chelates The chemical structure of each unit can only provide 3 coordination atoms to participate in the chelation reaction, and the treatment effect on highly complexed heavy metal wastewater is not good.

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

Feeding ratio is difficult to control, excessive feeding will easily lead to slow sedimentation rate, and less feeding will easily lead to incomplete precipitation of heavy metals