Abstract
In this study, a weak magnetic field (WMF), superimposed with a permanent magnet, was utilized to improve ZVI corrosion and thereby enhance As(V)/As(III) removal by ZVI at pHini 3.0-9.0. The experiment with real arsenic-bearing groundwater revealed that WMF could greatly improve arsenic removal by ZVI even in the presence of various cations and anions. The WMF-induced improvement in As(V)/As(III) removal by ZVI should be primarily associated with accelerated ZVI corrosion, as evidenced by the pH variation, Fe2+ release, and the formation of corrosion products as characterized with X-ray absorption fine structure spectroscopy. The arsenic species analysis in solution/solid phases at pHini 3.0 revealed that As(III) oxidation to As(V) in aqueous phase preceded its subsequent sequestration by the newly formed iron (hydr)oxides. However, both As(V) adsorption following As(III) oxidation to As(V) in solution and As(III) adsorption preceding its conversion to As(V) in solid phase were observed at pHini 5.0-9.0. The application of WMF accelerated the transformation of As(III) to As(V) in both aqueous and solid phases at pHini 5.0-9.0 and enhanced the oxidation of As(III) to As(V) in solution at pHini 3.0. © 2014 American Chemical Society.
Recommended Citation
Y. Sun et al., "Effect Of Weak Magnetic Field On Arsenate And Arsenite Removal From Water By Zerovalent Iron: An XAFS Investigation," Environmental Science and Technology, vol. 48, no. 12, pp. 6850 - 6858, American Chemical Society, Jun 2014.
The definitive version is available at https://doi.org/10.1021/es5003956
Department(s)
Civil, Architectural and Environmental Engineering
Publication Status
Open Access
International Standard Serial Number (ISSN)
1520-5851; 0013-936X
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 American Chemical Society, All rights reserved.
Publication Date
17 Jun 2014
PubMed ID
24870265
