Modified silica gel, and preparation method and adsorption application method thereof

A silica gel, modified technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, silicon compounds, etc., can solve the problems of large amount of eluent, waste residue, waste liquid and waste gas, etc., and achieve high content of surface functional groups , the effect of reducing waste, good adsorption selection performance

Inactive Publication Date: 2018-06-15
FUYANG XINYIHUA MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after using the modified silica gel in the prior art to adsorb precious metals, the amount of eluent used when eluting and reclaiming heavy metals is relatively large, which is basically 50 times the amount of silica gel, and there are more waste residues, waste liquids, and waste gases produced simultaneously (see CN 104745814A )

Method used

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  • Modified silica gel, and preparation method and adsorption application method thereof
  • Modified silica gel, and preparation method and adsorption application method thereof
  • Modified silica gel, and preparation method and adsorption application method thereof

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preparation example Construction

[0042] According to another aspect of the present invention, there is provided a method for preparing modified silica gel, including:

[0043] The acidified silica gel, a solvent, an alkaline reagent, a silane coupling agent containing a mercapto functional group and a halogen are mixed and heated to reflux to obtain the modified silica gel.

[0044] The steps to activate silica gel by acidification treatment include: boiling with 1:1 nitric acid (the volume ratio of concentrated nitric acid to water is 1:1) for three hours, cooling, washing with water until neutral, and then using 1:1 hydrochloric acid (concentrated hydrochloric acid) The volume ratio to water is 1:1) Shaking and soaking for 6 hours, washing with water until no chlorine ions; drying at 160 degrees for 12 hours, cooling in a desiccator to obtain the acidified silica gel.

[0045] According to an embodiment of the present invention, the heating and refluxing is performed under stirring conditions, and the stirring spe...

Embodiment approach

[0046] According to an embodiment of the present invention, the preparation method of the modified silica gel further includes:

[0047] Wash the resulting modified silica gel with toluene, ethyl acetate, ethanol, water, and ethanol successively;

[0048] Dry under reduced pressure at 50-70 degrees Celsius to obtain solid modified silica gel.

[0049] According to an embodiment of the present invention, the silane coupling agent containing mercapto functional groups and halogens is selected from 1-chloro-8-(trimethoxysilyl)octane-4-thiol, 1-bromo-8 -(Trimethoxysilyl)octane-4-thiol, 1-iodo-8-(trimethoxysilyl)octane-4-thiol, 1-chloro-9-(trimethoxysilyl) Nonane-5-thiol, 1-bromo-9-(trimethoxysilyl)nonane-5-thiol, 1-iodo-9-(trimethoxysilyl)nonane-5-thiol, 1-chloro-10-(trimethoxysilyl)decane-6-mercaptan, 1-bromo-10-(trimethoxysilyl)decane-6-mercaptan, 1-iodine-10-(trimethyl (Oxysilyl)decane-6-thiol, 1-chloro-7-(trimethoxysilyl)heptane-4-thiol, 1-bromo-7-(trimethoxysilyl)heptane- 4-merc...

preparation Embodiment 1

[0056] Add 4.0 kg of silica gel (purchased from Qingdao Bangkai, preferably 200-300 mesh silica gel powder), 12 kg of toluene, 200 g of triethylamine, and 1-chloro-8-(trimethoxysilyl)octane-4 in a 200L kettle. -Mercaptan (purchased from Qufu Jiaye New Chemical Material Co., Ltd.) 3kg;

[0057] Start stirring, stirring speed 200r / min; keep refluxing reaction for 24 hours, reduce to room temperature for filtration;

[0058] Wash with toluene, ethyl acetate, ethanol, water, ethanol in sequence, and dry under reduced pressure at 60 degrees Celsius to obtain 4.06 kg of modified silica gel.

[0059] Elemental analysis was performed on the modified silica gel obtained in Preparation Example 1, and the results were: C (5.13%), H (0.86%), S (1.71%), Cl (1.89%). It was confirmed that after the reaction, the chlorooctane containing the thiol group had been connected to the silica gel. And according to the elemental composition analysis, it can be calculated that the amount of substances conta...

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Abstract

The invention relates to modified silica gel, and a preparation method and an adsorption application method thereof. The modified silica gel adopts a thiol group bonded on a silica gel skeleton to becomplexed with heavy metal ions, and the modified silica gel complexed with the heavy metal ions is eluted with thiourea-containing hydrochloric acid to recover heavy metals. The adsorption recovery method can improve the recovery rate of the heavy metal ions and reduce the consumption amount of hydrochloric acid during elution, thereby reducing waste during recovery of the noble heavy metal ionsin an industrial waste liquid, and reducing the discharge of waste residues, waste liquids and waste gas.

Description

Technical field [0001] The invention relates to a modified silica gel and a preparation method and an adsorption application method thereof. Background technique [0002] Noble metals mainly refer to gold, silver and platinum group metal elements (platinum, palladium, ruthenium, rhodium, iridium and osmium). As a rare resource, precious metals are known as "industrial vitamins" and are widely used in the fields of medicine, chemicals, electroplating, electronics, national defense and military industry. In the production process of these industrial products, it is inevitable that a certain amount of metal residues will be left in the products or discharged into industrial waste liquid in large quantities. On the one hand, due to the scarcity of resources, the recovery of these lost precious metals has important economic significance; on the other hand, the precious metals remaining in the industrial waste liquid will cause environmental pollution, and the precious metals left in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C01B33/146C01B33/145C02F101/20
CPCB01J20/265C01B33/145C01B33/146C02F1/285C02F2101/20
Inventor 王占奇
Owner FUYANG XINYIHUA MATERIAL TECH
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