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Degradable heavy metal capture agent as well as preparation method and application thereof

A heavy metal scavenger and sedimentation agent technology, which is applied in chemical instruments and methods, other chemical processes, metallurgical wastewater treatment, etc., can solve the problems of anti-dissolution, difficult degradation, slow precipitation, etc., and achieve rapid sedimentation, easy degradation, and difficult secondary The effect of secondary pollution

Inactive Publication Date: 2018-03-27
SHUNDE POLYTECHNIC
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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 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; however, there are still some technical defects in the patent application for this invention: (1) Most complex electroplating wastewater is acidic wastewater, which cannot be directly added and used, and the pH value needs to be adjusted to medium (2) Under alkaline conditions, it is difficult to control the feeding ratio of the new heavy metal scavenger, and excessive feeding will easily cause slow precipitation or no precipitation and reverse dissolution; (3) the heavy metal scavenger chelates The complexing ability is average, and each unit chemical structure 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; molecular compound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] It is a degradable heavy metal scavenger, and the preparation steps are 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 to 45°C, and dissolve it for 0.5 hours; under nitrogen protection, add 0.2 parts of initiator azodiisobutylamidine hydrochloride V-50 and 18 parts of N-vinylformamide (NVF) were polymerized for 3 hours, and the reaction was stopped by cooling; 100 parts of ethanol were added for precipitation separation, filtration and drying to obtain high-purity konjac glucomannan- Graft-poly-N-vinylformamide copolymer (KGM-g-PNVF); the graft ratio of N-vinylformamide was determined to be 30% by elemental analysis and nuclear magnetic resonance analysis;

[0027] Step 2 Synthesis of cyclohexanediaminetetraacetic acid dianhydride (CDTAD)

[0028] Dissolve 10 parts of cyclohexanediaminetetraacetic acid and 10 parts of acetic anhydride in 10 parts of 2-picoline, contr...

Embodiment 2

[0034] It is a degradable heavy metal scavenger, and the preparation steps are 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 55 ° C, and dissolve for 0.7 hours; under nitrogen protection, add 0.5 parts of initiator azodiisobutylamidine hydrochloric acid Salt V-50 and 30 parts of N-vinylformamide (NVF) were grafted and copolymerized for 6 hours, and the reaction was stopped by cooling; 200 parts of ethanol were added for precipitation separation, filtration and drying to obtain high-purity konjac glucomannan Sugar-graft-poly-N-vinylformamide copolymer (KGM-g-PNVF); the N-vinylformamide grafting rate was determined to be 49% by elemental analysis and nuclear magnetic resonance analysis;

[0037] Step 2 Synthesis of cyclohexanediaminetetraacetic acid dianhydride (CDTAD)

[0038] Dissolving 20 parts of cyclohexanediaminetetraacetic acid and 20 parts of acetic anhydride in ...

Embodiment 3

[0044] It is a degradable heavy metal scavenger, and the preparation steps are 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 to 65°C, and dissolve for 0.7 hours; under nitrogen protection, add 0.7 parts of initiator azodiisobutylamidine hydrochloride V-50 and 40 parts of N-vinylformamide (NVF) were grafted and copolymerized for 12 hours, and the reaction was stopped by cooling; 350 parts of ethanol were added for precipitation separation, filtration and drying to obtain high-purity konjac glucomannan -Graft-poly-N-vinylformamide copolymer (KGM-g-PNVF); the graft ratio of N-vinylformamide was determined to be 70% by elemental analysis and nuclear magnetic resonance analysis;

[0047] Step 2 Synthesis of cyclohexanediaminetetraacetic acid dianhydride (CDTAD)

[0048] Dissolving 25 parts of cyclohexanediaminetetraacetic acid and 25 parts of acetic anhydride in 25 parts of 2-...

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Abstract

The invention relates to a degradable heavy metal capture agent as well as a preparation method and application thereof. The degradable heavy metal capture agent is characterized by being prepared from konjac glucomannan, water, an initiator, namely azobis(isobutyramidine) dihydrochloride V-50, N-vinylformamide, cyclohexanediamine tetraacetic dianhydride, potassium hydroxide and carbon disulfide.The degradable heavy metal capture agent can be used for treating heavy metal wastewater discharged during electroplating, smelting, mining, mineral separation, chemical engineering, machinery and thelike. According to the capture agent disclosed by the invention, complexing heavy metal ions can be adsorbed by novel chelating functional groups grafted by a synthetic konjac glucomannan macromolecular framework, each basic unit can provide hexa-coordinate atoms for performing strong chelating adsorption, and large aggregate is further produced in seconds by virtue of a chemical precipitation reaction carried out between dithiocarbamate on a sedimentation-aided side chain grafted by konjac glucomannan and a sedimentation assistant, so as to implement rapid sedimentation.

Description

technical field [0001] The invention belongs to the field of biomass material and waste water treatment, and in particular relates to a degradable heavy metal scavenger and a preparation method and application thereof. 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 precipitation method, ion exchange method, activated carbon adsorption method, etc. Compared with the ion exchange method and the activated carbon adsorption method, the heavy metal scavenger precipitatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/56C02F1/52C02F1/62C02F101/20C02F103/16
CPCB01J20/264B01J2220/4812B01J2220/4825C02F1/285C02F1/286C02F1/5236C02F1/56C02F2101/20C02F2103/16
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 SHUNDE POLYTECHNIC
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