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Organic-inorganic composite anion exchange resin for adsorbing hexavalent chromium ions and preparation method thereof

A hexavalent chromium ion and inorganic composite technology, applied in the direction of anion exchange, anion exchanger material, ion exchange, etc., can solve the problems of low chromium adsorption capacity, narrow pH range, etc., achieve uniform distribution, simple operation, high ratio The effect of surface area

Inactive Publication Date: 2009-12-30
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pH range of these two adsorbents is narrow, and they only have high adsorption capacity for hexavalent chromium ions under acidic conditions, and have very low adsorption capacity for chromium under neutral and alkaline conditions.

Method used

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  • Organic-inorganic composite anion exchange resin for adsorbing hexavalent chromium ions and preparation method thereof
  • Organic-inorganic composite anion exchange resin for adsorbing hexavalent chromium ions and preparation method thereof
  • Organic-inorganic composite anion exchange resin for adsorbing hexavalent chromium ions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Take 1g of P123 and 1g of NaCl, add 7.5mL of distilled water and 30mL of 2mol / L hydrochloric acid, stir until dissolved at 40°C, add 2.05mL of TEOS, stop stirring after 5min, pre-hydrolyze for 1h under static conditions, add 0.33g of MTICl After stirring for 2 minutes, stop stirring, hydrolyze for 20 hours under static conditions, put it into a polytetrafluoroethylene-lined reactor, and crystallize at 100°C for 2 days. After cooling, filter, wash, and dry. The obtained solid is placed in a fat extractor and used Ethanol extraction 24h, air-drying, obtain the chlorine type organic-inorganic composite anion exchange resin that is used to adsorb hexavalent chromium ion, this product is short stick shape, the result is as follows: figure 1 , the specific surface area is 716m 2 / g, the average pore diameter is 6.5nm. According to thermogravimetric analysis, the temperature at which the organic functional group of the product begins to decompose is 408°C.

[0024]...

Embodiment 2

[0025] Example 2 Take 2g of P123, add 15mL of distilled water and 60mL of 2mol / L hydrochloric acid, stir until dissolved at 40°C, add 4.1mL of TEOS and stir for 1h, add 0.66g of MTICl, continue to stir for 20h, and then put the liner into polytetrafluoroethylene Crystallize at 100°C for 2 days in a reaction kettle, filter, wash, and dry after cooling. The obtained solid is placed in a fat extractor, extracted with ethanol for 24 hours, and air-dried to obtain a chlorine-type organic- Inorganic composite anion exchange resin, the product is fibrous, the result is as follows figure 2 , the specific surface area is 624m 2 / g, the average pore diameter is 6.3nm.

[0026] Get 0.01g of the chlorine-type organic-inorganic composite anion exchange resin synthesized in this embodiment and add 15mL of 100mg / L Cr(VI) solution, shake for 1h, and use spectrophotometry to detect the concentration of chromium in the remaining solution, and the adsorption capacity for chromium is 45mg / g. ...

Embodiment 3

[0027] Example 3 Take 4g of P123, add 30mL of distilled water and 120mL of 2mol / L hydrochloric acid, stir until dissolved at 35°C, add 8.2mL of TEOS, stir for 8min, stop stirring, pre-hydrolyze for 1h under static conditions, add 1.32g of MTICl, and stir for 3min Then stop stirring, hydrolyze for 24 hours under static conditions, put it into a reactor lined with polytetrafluoroethylene, crystallize at 100°C for 2 days, filter, wash and dry after cooling, put the obtained solid in a fat extractor, and extract it with ethanol 24h, air-dried, obtains the chlorine-type organic-inorganic composite anion exchange resin that is used for adsorbing hexavalent chromium ion, and this product is short stick shape, and specific surface area is 662m 2 / g, the average pore diameter is 6.3nm.

[0028] Get 0.01g of the chlorine-type organic-inorganic composite anion exchange resin synthesized in this embodiment and add 15mL of 100mg / L Cr(VI) solution, shake for 1h, and use spectrophotometry to...

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Abstract

The invention provides organic-inorganic composite anion exchange resin for adsorbing hexavalent chromium ions and a preparation method thereof. The organic-inorganic composite anion exchange resin takes mesoporous molecular sieve SBA-15 as a carrier, and the surface thereof contains amphiprotic organo-functional groups; the amphiprotic organo-functional groups can be methyl imidazolium chloride, methyl imidazolium sulfateradical and methyl imidazolium bitrate radical. The organic-inorganic composite anion exchange resin features specific surface area which is larger than 400m<2> / g; high thermostability: the organic functional group starts to decompose until the temperature reaches 387-408 DEG C; regular open-framework structure: the bore diameter is more than 5.4nm; high adsorption capacity, which can reach 91mgCr (VI) / g; applicable pH, which ranges from 1 to 8; and easy regeneration.

Description

technical field [0001] The invention relates to an organic-inorganic composite anion exchange resin for absorbing hexavalent chromium ions and a preparation method. Background technique [0002] Chromium pollution mainly comes from wastewater discharged from industries such as tanning, electroplating, metal processing, metallurgy, printing, textiles, dyes, etc. Due to improper use of chromium and its related products, a large amount of chromium-containing waste is lost to the environment, thus affecting soil, Water bodies have been seriously polluted. Water-soluble hexavalent chromium compounds are strong carcinogens, listed as one of the eight most harmful chemical substances to the human body, and have very large toxic effects on the human body and the environment. Therefore, the purification treatment of chromium-containing wastewater is of great significance to improve the environment. [0003] The methods commonly used to treat chromium-containing wastewater mainly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/08C02F1/42C02F1/62B01J41/12
Inventor 陈继祝丽荔张弨刘英辉王东阳
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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