Method for absorbing hexavalent chromium in wastewater by using strong alkali anion exchange resin containing glyoxaline structure

A technology of hexavalent chromium ion and exchange resin, which is applied in the field of strong base anion exchange resin to adsorb hexavalent chromium ion in wastewater to achieve the effect of easy regeneration

Active Publication Date: 2009-05-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Literature search shows that there is no report on the use of strong base anion exchange resin containing imidazole structure to adsorb hexavalent chromium ions in wastewater

Method used

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  • Method for absorbing hexavalent chromium in wastewater by using strong alkali anion exchange resin containing glyoxaline structure
  • Method for absorbing hexavalent chromium in wastewater by using strong alkali anion exchange resin containing glyoxaline structure
  • Method for absorbing hexavalent chromium in wastewater by using strong alkali anion exchange resin containing glyoxaline structure

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1 Take 5 g of chloromethylated polystyrene resin (1% divinylbenzene, 3.5 mmolCl / g) in a three-necked flask, add 30 mL of N, N-dimethylformamide, stir at room temperature for 2 h, add 1.65 g N-methylimidazole was reacted at 80°C for 36h, and the synthetic resin was filtered and washed with ethanol. Stir the washed resin in 30 mL of ethanol at 65°C for 24 hours, filter the resin and dry it in vacuum to obtain a resin containing an amphoteric imidazole chloride salt structure, that is, a chlorine-type strong base anion exchange resin containing an imidazole structure.

[0034] Shake 1 g of chlorine-type strong base anion exchange resin containing imidazole structure with 20 mL, 2 mol / L sodium sulfate solution for 1 h and filter the resin. This step is repeated 3 times, and ion chromatography detects that there are no chloride ions in the filtrate for the third time. Then wash the filtered resin with a large amount of deionized water to remove excess sulfate ions to...

Embodiment 2

[0036]Example 2 Take 0.01 g of a chlorine-type strong base anion exchange resin containing an imidazole structure and place it in a container, add 15 mL of waste water containing 50 mg / L of hexavalent chromium ions, shake for 60 minutes to reach equilibrium, and detect the concentration of remaining hexavalent chromium ions in the waste water It is 0.34mg / L, reaching the wastewater discharge standard stipulated in China.

Embodiment 3

[0037] Example 3 Take 0.01 g of a chlorine-type strong base anion exchange resin containing an imidazole structure and place it in a container, add 15 mL of waste water containing 60 mg / L of hexavalent chromium ions, shake for 60 minutes to reach equilibrium, and detect the concentration of remaining hexavalent chromium ions in the waste water lower than 0.47mg / L.

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Abstract

The invention provides a method for absorbing hexavalent chrome ions from waste water by strongly basic anion exchange resin with imidazole structure. The strongly basic anion exchange resin with imidazole structure is crosslinked styrene resin, which comprises counter ions of chloride ions, sulfate ions and nitrate ions. The resin has the advantages of high thermal stability, high absorption capacity, adjustable hydrophilic-hydrophobic property, wide pH using range from 1-14, complete absorption of the hexavalent chrome anions from the waste water, full utilization of active exchange position, high selectivity to the hexavalent chrome anions, large absorption capacity, easy regeneration and reusability.

Description

technical field [0001] The invention relates to a method for adsorbing hexavalent chromium ions in waste water by a strong base anion exchange resin containing an imidazole structure. Background technique [0002] 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. 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 caused serious pollution. Hexavalent chromium is 100 times more toxic than trivalent chromium. China stipulates that the maximum allowable discharge concentration of hexavalent chromium in surface water is 0.5mg / L. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42
Inventor 陈继祝丽荔刘英辉
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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