Biomass chelation modified heavy metal composite capture agent and its preparation method and application

Abstract

The invention relates to a biomass chelate-modified heavy metal composite capturing agent, and a preparation method and an application thereof. The biomass chelate-modified heavy metal composite capturing agent is prepared from konjac glucomannan, water, an initiator 2,2'-azobis[2-methylpropionamidine] dihydrochloride V-50, N-vinylformamide (NVF), 1,2-cyclohexanediaminetetraacetic acid dianhydride, potassium hydroxide, carbon disulfide and sodium di-n-butyldithiocarbamate, and the biomass chelate-modified heavy metal composite capturing agent is used to treat heavy metal wastewater dischargedin the processes of electroplating, smelting, mining, mineral separation, chemical engineering and mechanical engineering. Complexation type heavy metal ions are adsorbed through the common action ofa konjac molecule skeleton-grafted novel chelating function group VACDTANa and the sodium di-n-butyldithiocarbamate, and generate a large aggregation in seconds through the synergistic effects of thekonjac molecule skeleton-grafted sodium dithiocarbamate and sodium di-n-butyldithiocarbamate and a chemical precipitation reaction of a settling aid in order to achieve rapid settlement.

Description

technical field [0001] The invention belongs to the field of biomass materials and wastewater treatment, and in particular relates to a biomass chelated modified heavy metal composite capture agent and its preparation method and application. It mainly discharges heavy metals from electroplating, smelting, mining, mineral processing, chemical industry and machinery. Wastewater industry applications. 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. Traditional methods of heavy metal wastewater treatment mainly include chemical precipitation, heavy metal scavenger precipitation, ion exchange, activate...

AI Technical Summary

Problems solved by technology

[0004] In recent years, new heavy metal scavenger has become a research hotspot. The Chinese patent discloses a patent application for the invention of a "polyethylenediamine tetraacetic acid unit polymer". Its publication number is CN 106986432A, which 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 added directly, 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, and the treatment effect on highly complexed heavy metal wastewater is not good; (4) The preparation cost of the new heavy metal scavenger is high, and it is difficult to popularize and use

[0005] Sodium di-n-butyldithiocarbamate (TP) is often used as a vulcanization accelerator for natural rubber, styrene-butadiene rubber, neoprene and latex, and is rarely used directly as a heavy metal scavenger. The main reason is that TP is effective for low-concentration heavy metal wastewater The sedimentation performance is poor