Environmental Chemistry

ISSN 0254-6108

CN 11-1844/X

Vol. 38 No. 5
May  2019
Article Contents

Citation:

The role of weak magnetic field in accelerating the removal of arsenic by zero-valent iron

  • Received Date: 2018-07-12
    Fund Project:

    Supported by the National Natural Science Foundation of China (41272261).

  • Arsenic is a toxic metalloid element. Severe pollution of arsenic has been found in soil and groundwater of many industrial sites. This paper investigated the enhancing effect and mechanism of 20 mT Weak Magnetic Field (WMF) on arsenic removal by Zero-valent iron (ZVI). Results showed that the enhancing effect of WMF on arsenic removal was significant under all pH conditions (5-9). Especially when initial pH was 7, the rate of reaction increased by 443% (from 0.21 s-1 to 1.14 s-1) and removal efficiency increased by 189% (from 30.9% to 89.1%) in the presence of WMF. Moreover, the enhancing effect of WMF was more significant by ZVI of smaller particle size (5-9 μm). In addition, we found that in the presence of WMF, more oxygen participated in the reaction, which promoted the corrosion of ZVI and generated more iron oxides and hydroxides. These substances accelerated the adsorption and precipitation of arsenic. The results of SEM and XPS supported this mechanism. Therefore, as an effective method to promote arsenic removal by ZVI, WMF is energy-free, chemical-free, environmental-friendly and has a prospective future.
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The role of weak magnetic field in accelerating the removal of arsenic by zero-valent iron

  • School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
Fund Project:  Supported by the National Natural Science Foundation of China (41272261).

Abstract: Arsenic is a toxic metalloid element. Severe pollution of arsenic has been found in soil and groundwater of many industrial sites. This paper investigated the enhancing effect and mechanism of 20 mT Weak Magnetic Field (WMF) on arsenic removal by Zero-valent iron (ZVI). Results showed that the enhancing effect of WMF on arsenic removal was significant under all pH conditions (5-9). Especially when initial pH was 7, the rate of reaction increased by 443% (from 0.21 s-1 to 1.14 s-1) and removal efficiency increased by 189% (from 30.9% to 89.1%) in the presence of WMF. Moreover, the enhancing effect of WMF was more significant by ZVI of smaller particle size (5-9 μm). In addition, we found that in the presence of WMF, more oxygen participated in the reaction, which promoted the corrosion of ZVI and generated more iron oxides and hydroxides. These substances accelerated the adsorption and precipitation of arsenic. The results of SEM and XPS supported this mechanism. Therefore, as an effective method to promote arsenic removal by ZVI, WMF is energy-free, chemical-free, environmental-friendly and has a prospective future.

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