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A kind of mercapto activated carbon and its preparation method and its application in the adsorption of alkylmercury

A technology of activated carbon and activated carbon powder, which is applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., and can solve problems such as poor adsorption effect of alkylmercury, low amount of mercapto groups introduced, uneven distribution of carbon surface, etc.

Active Publication Date: 2019-12-06
上海申丰地质新技术应用研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the existing technologies use or produce certain types of special functional groups on the surface of activated carbon, such as the reaction between active hydroxyl groups and mercapto precursors, so as to graft mercapto functional groups to the surface of activated carbon, and the introduction of mercapto groups is low. Inhomogeneous, and finally the problem of poor adsorption effect on alkylmercury

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  • A kind of mercapto activated carbon and its preparation method and its application in the adsorption of alkylmercury
  • A kind of mercapto activated carbon and its preparation method and its application in the adsorption of alkylmercury
  • A kind of mercapto activated carbon and its preparation method and its application in the adsorption of alkylmercury

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preparation example Construction

[0026] The invention provides a kind of preparation method of mercapto activated carbon, comprising the following steps:

[0027] (1) O-aminothiophenol, melamine, and formaldehyde are subjected to methylolation and polycondensation reactions in absolute ethanol to obtain a thiol prepolymerization modification liquid;

[0028] (2) carry out modification treatment after the mercapto group pre-polymerization modification liquid that described step (1) obtains is mixed with activated carbon powder, obtain o-aminothiophenol polymer modified activated carbon;

[0029] (3) heat-treat the modified activated carbon obtained in the step (2) to obtain mercapto activated carbon.

[0030] In the invention, the methylolation and polycondensation reactions of o-aminothiophenol, melamine and formaldehyde are carried out in an absolute ethanol solution to obtain a thiol prepolymerized modification liquid. In the present invention, the concentration of the thiol pre-polymerization modification...

Embodiment 1

[0060] Weigh the corresponding mass of o-aminothiophenol, formaldehyde solution (37wt.%) and absolute ethanol according to the molar ratio of o-aminothiophenol: formaldehyde: absolute ethanol = 1:1.2:3, and keep stirring at 20°C After 0.5h, the sulfur-containing pre-polymerization liquid was obtained, which was cooled for later use.

[0061] According to the molar ratio of melamine (M): formaldehyde (F): dehydrated alcohol=1:2:3, weigh the melamine of corresponding quality:, formaldehyde solution (37wt.%) and dehydrated alcohol, keep stirring at 40 ℃ for 0.5 h, to obtain a nitrogen-containing pre-polymerization solution, which is cooled for subsequent use.

[0062] The obtained sulfur-containing pre-polymerization liquid and the nitrogen-containing pre-polymerization liquid are mixed by o-aminothiophenol: the mol ratio of melamine is 5:1, and finally diluted to total polymer (o-aminothiophenol) with dehydrated alcohol +melamine+formaldehyde) concentration is 100g / L, obtains t...

Embodiment 2

[0068] Weigh the corresponding mass of o-aminothiophenol, formaldehyde solution (37wt.%) and absolute ethanol according to the molar ratio of o-aminothiophenol: formaldehyde: absolute ethanol = 1:2:10, keep stirring at 40°C After 4 hours, the sulfur-containing pre-polymerization solution was obtained, which was cooled for later use.

[0069] According to the molar ratio of melamine: formaldehyde: absolute ethanol = 1:3:10, weigh the corresponding mass of melamine, formaldehyde solution (37wt.%) and absolute ethanol, and keep stirring at 60°C for 4h to obtain the nitrogen-containing prepolymerization liquid , cooled and set aside.

[0070] The obtained sulfur-containing pre-polymerization liquid and the nitrogen-containing pre-polymerization liquid are mixed in a ratio of 5:5 by the mol ratio of o-aminobenzenethiophenol: melamine, and finally diluted to total polymer (o-aminobenzenethiol) with dehydrated alcohol Phenol+melamine+formaldehyde) concentration is 200g / L, obtains th...

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Abstract

The invention provides a sulfhydryl activated carbon preparation method, which belongs to the field of active carbon modification. The method is characterized in that o-amino thiophenol, melamine andformaldehyde are subjected to hydroxymethylation and condensation polymerization in absolute ethyl alcohol, a mercapto prepolymerization modified liquid is obtained, and is mixed with active carbon powder for modification processing, and the o-amino thiophenol polymer modified active carbon is obtained; the modified active carbon is subjected to heat treatment, and the mercapto active carbon is obtained. The mercapto prepolymerization modified liquid formed by o-amino thiophenol, melamine and formaldehyde is used for modifying the active carbon powder, an o-amino thiophenol polymer layer withnano size and uniform distribution is generated at the surface of the active carbon powder, the content of the mercapto function group can be regulated and controlled by adjusting the proportion of o-amino thiophenol and the active carbon powder in a large range, and the adjustable mercapto modified active carbon with uniform mercapto distribution can be obtained through heat treatment, controllable introducing and distribution of the mercapto function group can be realized, and the adsorption performance of the mercapto active carbon on the alkyl mercury can be increased.

Description

technical field [0001] The invention relates to the technical field of activated carbon modification, in particular to a mercapto activated carbon, a preparation method thereof and an application in alkylmercury adsorption. Background technique [0002] Alkylmercury (methylmercury, ethylmercury) is a class of highly toxic and carcinogenic organometallic compounds. These compounds are highly fat-soluble and tend to remain in the adipose tissue of organisms in natural water bodies. It is enriched in the food chain, thereby causing serious harm to humans and animals. [0003] The techniques for enriching mercury compounds in environmental samples can be roughly divided into six types: acidolysis solvent enrichment, alkali digestion enrichment, acid volatilization pre-enrichment, cold trap trapping, solid-phase micro-enrichment, and solid-phase extraction. Among them, the solid-phase extraction method is widely used in China, which uses mercapto-containing solids as fillers to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/354C01B32/372B01J20/20B01J20/30
CPCB01J20/20C01P2004/03
Inventor 郦胜孙秀容张小会沈凌常继兵王珂杨佩佩郦逸根
Owner 上海申丰地质新技术应用研究所有限公司