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Biological polysaccharide-based heavy metal trapping agent and preparation method thereof

A heavy metal capture agent and biological polysaccharide technology, which is applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problem of single type of heavy metal chelating functional groups, poor heavy metal capture performance, and cumbersome preparation process and other problems, to achieve the effect of strong affinity, small amount of addition, and wide range

Active Publication Date: 2020-04-03
威海汉邦生物环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although natural polymer materials have a wide range of sources, low cost, easy degradation, many active groups on the molecular structure, and strong adsorption capacity, in the synthesis, taking starch as an example, it is necessary to add a cross-linking agent to increase the molecular weight and change the molecular structure. It forms a network, and it also needs methods such as gelatinization or oxidation to make it difficult to retrograde and improve the stability and activation ability of the product, which increases the complexity of the preparation process, and the heavy metal chelating functional groups are single. Poor and unstable heavy metal capture performance under medium conditions such as high temperature strong alkali or strong acid

Method used

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  • Biological polysaccharide-based heavy metal trapping agent and preparation method thereof
  • Biological polysaccharide-based heavy metal trapping agent and preparation method thereof
  • Biological polysaccharide-based heavy metal trapping agent and preparation method thereof

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preparation example Construction

[0029] A preparation method of a biological polysaccharide-based heavy metal scavenger, characterized in that the preparation method of the metal scavenger is as follows:

[0030]1) Graft copolymerization of biopolysaccharides: heat the biopolysaccharide solution to 20-30°C with sufficient nitrogen gas, add an initiator at a dosage of 1-3wt‰ (accounting for the solid mass ratio of the total reactants), and control the stirring speed at 100-150r / min, after 10-15min, slowly add the mixed solution of 2-acrylamide-2-methylpropanesulfonate sodium and acrylamide, increase the speed to 200-250r / min, stir for 10-15min and heat up to 40°C Afterwards, stop stirring and keep warm for 4-6 hours to obtain a biopolysaccharide graft copolymer containing sulfonic acid groups and amide groups; 2) Xanthation reaction: adjust the pH of the product in 1) to 8-12, and lower the temperature of the system to Control at 25-40°C, then slowly add carbon disulfide dropwise, the mass ratio of its dosage ...

Embodiment 1

[0033] Graft copolymerization reaction of biological polysaccharides: weigh biological polysaccharides to prepare 200g of 15% aqueous solution, and prepare 40% sodium 2-acrylamide-2-methylpropanesulfonate and acrylamide (the mass ratio of the two is 1:5) 100g of the mixed solution was set aside, then poured the biopolysaccharide solution into a three-necked flask, started stirring and raised the temperature to 30°C, and after the nitrogen was fully ventilated to remove oxygen, 0.07g of potassium persulfate was added, the stirring speed was adjusted to 150r / min, and after stirring for 10min Add 0.02g sodium sulfite, continue to stir for 10min, start to slowly add the mixed solution of 2-acrylamide-2-methylpropanesulfonate sodium and acrylamide, and adjust the speed to 200r / min, stir for 15min, then raise the temperature to 40°C, stop Stir, stop nitrogen, keep warm for 4h.

[0034] Xanthogenation reaction: Cool the above product to room temperature, adjust the pH to 10.0, then r...

Embodiment 2

[0042] Graft copolymerization reaction of biopolysaccharide: weigh biopolysaccharide to make 15% aqueous solution 200g, and prepare 7.5% sodium 2-acrylamide-2-methylpropanesulfonate and acrylamide (the mass ratio of the two is 1:1) 400g of the mixed solution was set aside, then poured the biopolysaccharide solution into a three-necked flask, started stirring and raised the temperature to 20°C, after sufficient nitrogen deoxygenation, added 0.15g of potassium persulfate, adjusted the stirring speed to 150r / min, and stirred for 10min Add 0.03g sodium bisulfite, continue to stir for 10min, start to slowly add the mixed solution of 2-acrylamide-2-methylpropanesulfonate sodium and acrylamide, and adjust the speed to 250r / min, stir for 10min and then heat up to 40 ℃, stop stirring, stop nitrogen, and keep warm for 4h.

[0043] Xanthogenation reaction: Cool the above product to room temperature, adjust the pH to 8-9, then raise the temperature to 40°C, start stirring, slowly add 15g ...

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Abstract

The invention relates to the technical field of heavy metal trapping agents and particularly relates to a biological polysaccharide-based heavy metal trapping agent and a preparation method thereof. The biological polysaccharide-based heavy metal trapping agent is characterized in that Dex is biological polysaccharide, a, c and d is larger than or equal to 1, and b and e are larger than or equal to 0. The preparation method comprises the steps of (1) graft copolymerization of the biological polysaccharide; (2) xanthation reaction, (3), oximation reaction, (4), saponification reaction and (5),purification. The biological polysaccharide-based heavy metal trapping agent prepared through the method has the advantages of wide heavy metal ion application range, wide pH range, high removal rateof various heavy metals and the like.

Description

technical field [0001] The invention relates to the technical field of heavy metal scavenger, in particular to a biopolysaccharide-based heavy metal scavenger with a wide range of applicable heavy metal ions, a wide pH range and a high removal rate for various heavy metals and a preparation method thereof. Background technique [0002] As we all know, heavy metal scavenger is a kind of organic compound that can selectively capture, separate and precipitate specific metal ions from the solution containing metal ions, which is a kind of organic compound that combines the matrix and chelating functional groups in the form of chemical bonds. According to the different sources of the matrix, it can be divided into two types: organic synthesis type and natural polymer type. Since the former has the characteristics of high toxicity and difficult degradation of monomers, the matrix material with low toxicity, environmental protection and easy degradation is selected as the natural hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/62C02F1/64C02F5/10C02F11/147C02F101/20C02F103/02C02F103/10
CPCC02F1/56C02F1/62C02F1/64C02F5/10C02F11/147C02F2101/20C02F2101/203C02F2103/023C02F2103/10
Inventor 庄茅胡阳
Owner 威海汉邦生物环保科技股份有限公司
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