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

A heavy metal scavenger and biomass technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of general chelation ability of heavy metal scavenger, difficult to control feeding, difficult to degrade, etc., to solve the problem of sedimentation The rate is difficult to control, not easy to secondary pollution, and the effect of rapid settlement

Active Publication Date: 2018-03-02
合肥九州龙腾科技成果转化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] It is a biomass chelating modified heavy metal trapping agent, and its preparation method is as follows:

[0025] Step 1 Synthesis of KGM-g-PNVF

[0026] Take 1 part of konjac glucomannan (KGM), add 100 parts of water, control the temperature at 45°C, and dissolve for 0.5 hours; under the protection of nitrogen, add 0.2 parts of the initiator azobisisobutylamidine hydrochloride V-50 and 14 parts of N-vinylformamide (NVF), polymerized for 4 hours, cooled to stop the reaction; added 100 parts of ethanol for precipitation separation, filtration and drying to obtain high-purity konjac glucomannan- Graft-poly N-vinyl formamide copolymer (KGM-g-PNVF); The grafting rate of N-vinyl formamide measured by elemental analysis and nuclear magnetic resonance instrument analysis is 25%;

[0027] Step 2 Synthesis of ethylene glycol diethyl ether diamine tetraacetic dianhydride (EGTAD)

[0028] Dissolve 10 parts of ethylene glycol diethyl ether diamine tetraacetic acid and 10 parts of...

Embodiment 2

[0034] It is a biomass chelating modified heavy metal trapping agent, and its preparation method is as follows:

[0035] Step 1 Synthesis of KGM-g-PNVF

[0036] Take 2 parts of konjac glucomannan (KGM), add 200 parts of water, control the temperature at 50°C, and dissolve for 0.7 hours; under the protection of nitrogen, add 0.5 parts of initiator azobisisobutylamidine hydrochloride Salt V-50 and 28 parts of N-vinylformamide (NVF), grafted and copolymerized for 5 hours, cooled to stop the reaction; added 200 parts of ethanol for precipitation separation, filtration and drying to obtain high-purity konjac glucomannan Sugar-graft-poly N-vinylformamide copolymer (KGM-g-PNVF); Elemental analysis and nuclear magnetic resonance instrument analysis determine that the N-vinylformamide grafting rate is 44%;

[0037] Step 2 Synthesis of ethylene glycol diethyl ether diamine tetraacetic dianhydride (EGTAD)

[0038] Dissolve 20 parts of ethylene glycol diethyl ether diamine tetraacetic a...

Embodiment 3

[0044] It is a biomass chelating modified heavy metal trapping agent, and its preparation method is as follows:

[0045] Step 1 Synthesis of KGM-g-PNVF

[0046] Take 4 parts of konjac glucomannan (KGM), add 350 parts of water, control the temperature at 60°C, and dissolve for 0.7 hours; under the protection of nitrogen, add 0.7 parts of the initiator azobisisobutylamidine hydrochloride V-50 and 44 parts of N-vinylformamide (NVF), grafted and copolymerized for 15 hours, cooled to stop the reaction; added 350 parts of ethanol for precipitation separation, filtration and drying to obtain high-purity konjac glucomannan -graft-poly N-vinyl formamide copolymer (KGM-g-PNVF); elemental analysis and nuclear magnetic resonance instrument analysis determine that the N-vinyl formamide grafting rate is 75%;

[0047] Step 2 Synthesis of ethylene glycol diethyl ether diamine tetraacetic dianhydride (EGTAD)

[0048] Dissolve 25 parts of ethylene glycol diethyl ether diamine tetraacetic acid...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20C02F103/16
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/20C02F2103/16
Inventor 刘锋路风辉陈燕舞霍应鹏张浥琨郭志杰洪丹彭琦唐秋实
Owner 合肥九州龙腾科技成果转化有限公司
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