Biomass chelated modified heavy metal capturing agent as well as preparation method and application thereof

Abstract

The invention relates to a biomass chelated modified heavy metal capturing agent as well as a preparation method and application thereof. The biomass chelated modified heavy metal capturing agent is characterized by being prepared from konjac glucomannan, water, an initiator azobis(2-methylpropionamidine)dihydrochloride V-50, N-vinylformamide, ethylene glycol-bis-(2-aminoethylether)-N,N,N',N'-tetraacetic dianhydride, potassium hydroxide and carbon disulfide; the biomass chelated modified heavy metal capturing agent is used for treating heavy-metal wastewater discharged by electroplating, smelting, mining, mineral dressing, chemical industry, machines and the like. According to the biomass chelated modified heavy metal capturing agent, complex heavy metal ions can be adsorbed through a synthesized konjac glucomannan macromolecular framework grafted novel chelated functional group; each basic unit can provide hexa-coordinate atoms to carry out strong chelating and adsorption; furthermore, sodium dithiocarbamate of a konjac glucomannan grafted sedimentation-assisting side chain and a sedimentation-assisting agent are subjected to chemical sedimentation reaction and a large aggregate is generated within a few of seconds, so that rapid sedimentation is realized.

Description

technical field [0001] The invention belongs to the field of biomass materials and wastewater treatment, and specifically relates to a biomass chelating modified heavy metal capture agent and its preparation method and application. It is mainly used in industries such as electroplating, smelting, mining, mineral processing, chemical industry and machinery to discharge heavy metal wastewater. application. Background technique [0002] Heavy metal wastewater mainly comes from electroplating, smelting, mining, mineral processing, chemical and machinery industries. The heavy metal-containing wastewater produced by these industries is discharged into natural water bodies, which not only poses a threat to aquatic organisms, but may also be continuously enriched in organisms through the food chain, eventually endangering human health. The traditional methods of heavy metal wastewater treatment mainly include chemical precipitation, heavy metal capture agent precipitation, ion exch...

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Problems solved by technology

[0004] In recent years, new heavy metal scavenger has become a research hotspot. The Chinese patent discloses an invention patent application for a "polyethylenediaminetetraacetic acid unit polymer", and its publication number is CN 106986432A; it has good heavy metal chelating ability, It can be widely used in various heavy metal wastewater industries and soil remediation, but there are still 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 from neutral to alkaline (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 Generally, the chemical structure of each unit can only provide 3 coordination atoms to participate in the chelation reaction, which is not effective for the treatment of highly complexed heavy metal wastewater; (4) The new type of heavy metal scavenger is a synthetic relatively refractory polymer compound