Method for removing high-concentration As (III) in water body through oxidation dissolution of ferrous sulfide (FeS)

A ferrous sulfide, high-concentration technology, applied in the direction of iron sulfide, chemical instruments and methods, oxidized water/sewage treatment, etc., to achieve good arsenic removal effect, arsenic removal effect and stable effect

Inactive Publication Date: 2017-06-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this is limited to literature research on the transformation and migration mechanism of low-concentration arsenic in the oxidation process of FeS, and there are few technologies and patents on the removal of high-concentration As(III) in water by FeS oxidation and dissolution.

Method used

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  • Method for removing high-concentration As (III) in water body through oxidation dissolution of ferrous sulfide (FeS)
  • Method for removing high-concentration As (III) in water body through oxidation dissolution of ferrous sulfide (FeS)

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Embodiment 1

[0026] (1) The preparation process of FeS (except the centrifugation process) is carried out in an anaerobic glove box with an argon atmosphere, and the Pt catalyst can be used to make the oxygen concentration in the box less than 0.5ppm;

[0027] (2) The aqueous solution used for FeS synthesis preparation is all prepared with oxygen-free deionized water purged with high-purity nitrogen for half an hour;

[0028] (3) Weigh 28.33g FeCl 2 4H 2 O and 39.63 g Na 2 S·9H 2 O was sent into the glove box, and 250mL of 0.57M Fe(II) solution and 150mL of 1.1M S(-II) solution were prepared respectively with anaerobic water;

[0029] (4) Under the condition of moderate stirring, quickly pour the Fe(II) solution in step (3) into the S(-II) solution, so that the two are quickly and fully mixed to obtain a black suspension, and put it in gloves Stirring and aging in the box for three days;

[0030] (5) After three days, the suspension in step (4) was centrifuged at 10,000 rpm in a high-...

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Abstract

The invention provides a method for removing high-concentration As (III) in a water body through oxidation dissolution of ferrous sulfide (FeS). According to the method, amorphous and high-activity FeS is synthesized in an anaerobic glove box by virtue of a simple chemical precipitation method, As (III) in the water body is removed by virtue of the oxidation dissolution of FeS, arsenic is removed by virtue of the adsorptive property of a Fe (III) iron mineral formed by FeS reaction and produced iron arsenate, a removal effect of As (III) is very good, a subsequent arsenic release phenomenon is avoided, and therefore, the arsenic removal effect is good and stable.

Description

technical field [0001] The invention belongs to the field of environmental engineering water treatment, relates to FeS oxidation and dissolution reaction, in particular to a method for removing high-concentration As(III) in water environment by utilizing FeS oxidation and dissolution process. Background technique [0002] The most important sources of arsenic in nature are natural processes such as rock weathering, groundwater erosion of mineral layers, and volcanic eruptions. Some human activities, such as the disposal of industrial chemical waste, mineral smelting, mining, fossil fuel combustion, and the use of pesticide preparations, etc. As an important source of arsenic in the environment, most of the released arsenic will enter the aquatic environment with the migration of rivers and groundwater. Arsenic is mutagenic and carcinogenic, and As(III) is 25-60 times more toxic than As(V). Long-term drinking of arsenic-containing water can lead to chronic poisoning, causing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C01G49/12C02F101/10
CPCC02F1/72C01G49/12C02F2101/103
Inventor 任海涛安学良
Owner TIANJIN POLYTECHNIC UNIV
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