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- Title
The enhancing effect of weak magnetic field on degradation of Orange II by zero-valent iron.
- Authors
Xiao, Zhongjin; Zhou, Qiaoli; Qin, Hejie; Qiao, Junlian; Guan, Xiaohong
- Abstract
The effects of weak magnetic field (WMF) on degrading Orange II by zero-valent iron (ZVI) as functions of pHini, ZVI dosages, and Orange II concentrations were investigated. The pseudo-first-order rate constants of Orange II removal by ZVI decreased progressively from 0.0057 to 0.0006 min−1without WMF and from 0.0419 to 0.0039 min−1with WMF, respectively, as pHiniincreased from 3.3 to 5.5. The pseudo-first-order rate constants of Orange II sequestration by ZVI were increased by 2.6- to 21-folds due to the application of WMF under the reaction conditions investigated in this study. The WMF-induced improvement in Orange II removal by ZVI was attributed to the accelerated corrosion of ZVI in the presence of WMF. The application of WMF not only improved the decolorization efficiency, but also enhanced TOC removal dramatically. The influence of radical scavenger and oxygen on Orange II removal as well as the FTIR analysis revealed that Orange II was removed via reduction by ZVI as well as adsorption/co-precipitation by the corrosion products. The method of employing WMF to enhance contaminants removal by ZVI is considered to be a promising technique in future water treatment since it does not need extra energy and costly reagents.
- Subjects
ZERO-valent iron; WATER purification; SIDEROPHILE elements; ELECTROMAGNETIC theory; MAGNETIC field effects
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 4, p1659
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.974213