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Method for removing arsenic in water

A technology for removing water and anions, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. Simple to use effects

Inactive Publication Date: 2014-05-21
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is well known that both arsenic and arsenic soluble compounds are highly toxic, and the toxicity varies with different compounds. Generally, the toxicity of trivalent arsenic is higher than that of pentavalent arsenic, and the toxicity of inorganic arsenic is higher than that of organic arsenic. Ingestion of low doses of inorganic arsenic, That is, it has a great negative impact on health, and it is easy to cause skin cancer, bladder cancer, kidney cancer and other diseases, and the latest research results show that arsenic is far more harmful to human health than estimated

Method used

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  • Method for removing arsenic in water
  • Method for removing arsenic in water
  • Method for removing arsenic in water

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Experimental program
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Embodiment approach

[0025] According to a typical embodiment of the present invention, a method for removing arsenic in water is provided, using the following molecular structure

[0026] Strong base anion exchange resin for removing arsenic in water, where n≥2.

[0027] The method has a high arsenic removal rate, high selectivity in the presence of some coexisting ions, simple process operation, and easy industrialization; and the strong base anion exchange resin has a wide pH range, and the pH is 1-14. Both have high adsorption capacity; fast adsorption rate, short equilibration time, large adsorption capacity; easy to regenerate, and can be recycled and reused.

[0028] Preferably, the strong base anion exchange resin is prepared by the following steps: chloromethylated styrene-divinylbenzene copolymer is prepared by reacting with N-methylimidazole under N, N-dimethylformamide swelling Strong base anion exchange resin with chloride ion as anion.

[0029] According to a typical fact mode of...

Embodiment 1

[0035] Take 5g of chloromethylated styrene-divinylbenzene copolymer resin, add 30mL of DMF to swell for 2h, then add 1.65g of N-methylimidazole, react at 80°C for no less than 36h, filter the resin and wash with ethanol for 3 ~5 times, then put the resin in 30 mL of ethanol and stir at 65°C for 24 hours, filter the resin and dry it under vacuum to obtain a chlorine-type strong base anion exchange resin containing N-methylimidazole structure.

[0036] Such as figure 1 Infrared spectra of the chloromethylated styrene-divinylbenzene copolymer resin (a) and the chlorine form of the strong base anion exchange resin (b) are shown. We can see that the absorption peaks at 1572cm-1 and 1160cm-1 are the skeleton vibration and C-H in-plane bending vibration peaks of the imidazole ring, respectively. This indicates that the Cl in the chloromethylated styrene-divinylbenzene copolymer resin is replaced by amphoteric methylimidazolium chloride groups.

Embodiment 2

[0038] Take 0.01g of strong base anion exchange resin and put it into a 25mL conical flask with a stopper, add 10mL of arsenate solution containing 10mg / L, and shake for 60min to reach equilibrium. drinking water standards.

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Abstract

The invention discloses a method for removing arsenic in water. According to the method, strong base anion exchange resin is used for removing arsenic in water; the molecular structural formula of the strong base anion exchange resin is shown in the specification, wherein n is more than or equal to 2. The method has the advantages of high arsenic removal rate, relatively high selectivity in the presence of certain co-existing ions, simple technological operation and facilitation of industrialization. The strong base anion exchange resin is wide in using pH range and relatively high in adsorption capacity under the condition that the pH value is 1-14. The strong base anion exchange resin is high in adsorption rate, short in equilibrium time, high in adsorption capacity and easy to regenerate and can be recycled.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a method for removing arsenic in water. Background technique [0002] Arsenic is widely distributed in nature and exists in rocks, soil, river water, sea water and the atmosphere in the earth's crust. It is well known that both arsenic and arsenic soluble compounds are highly toxic, and the toxicity varies with different compounds. Generally, the toxicity of trivalent arsenic is higher than that of pentavalent arsenic, and the toxicity of inorganic arsenic is higher than that of organic arsenic. Ingestion of low doses of inorganic arsenic, That is to say, it has a great negative impact on health, and it is easy to cause diseases such as skin cancer, bladder cancer, and kidney cancer, and the latest research results show that the harm of arsenic to human health has far exceeded estimates. The World Health Organization (WHO) recommended the latest drinking water standar...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F1/58B01J41/14
Inventor 贾敏李依帆刘瑞平徐靓高莹陈东郭昭华王思琦
Owner CHINA SHENHUA ENERGY CO LTD
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