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Effects of reducing agents on the degradation of 2,4,6-tribromophenol in a heterogeneous Fenton-like system with an iron-loaded natural zeolite

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Title: Effects of reducing agents on the degradation of 2,4,6-tribromophenol in a heterogeneous Fenton-like system with an iron-loaded natural zeolite
Authors: Fukuchi, Shigeki Browse this author
Nishimoto, Ryo Browse this author
Fukushima, Masami Browse this author →KAKEN DB
Zhu, Qianqian Browse this author
Keywords: Fe-loading
Natural zeolite
2,4,6-Tribromophenol
Heterogeneous Fenton system
Reducing agents
Issue Date: 5-Apr-2014
Publisher: Elsevier science bv
Journal Title: Applied catalysis b-environmental
Volume: 147
Start Page: 411
End Page: 419
Publisher DOI: 10.1016/j.apcatb.2013.09.032
Abstract: The effects of reducing agents on the degradation of 2,4,6-tribromophennol (TrBP) were investigated in a heterogeneous Fenton-like system using an iron-loaded natural zeolite (Fe-Z). The catalytic activity for TrBP oxidation in the presence of the Fe-Z and H2O2 was not appreciable. The addition of a reducing agent, such as ascorbic acid (ASC) or hydroxylamine (NH2OH), resulted in an enhancement in the degradation and debromination of TrBP. TrBP was completely degraded and debrominated at pH 3 and 5 in the presence of NH2OH, while the degradation was significantly suppressed at pH 7 and 9. Although the rates of TrBP degradation were relatively constant at pH 3, 5, 7 and 9 in the presence of ASC, the percent degradation reached a plateau at 70%. These results show that ASC functions as a strong HO. scavenger, as opposed to NH2OH, at pH 3 and 5. Thus, adding NH2OH is preferable for the degradation of TrBP via a Fenton-like system using Fe-Z as the catalyst. It is noteworthy that the complete mineralization of TrBP was achieved at pH 5, when NH2OH and H2O2 were sequentially added to the reaction mixture. Analysis of the surface of Fe-Z by X-ray photoelectron spectrometry indicated that the Fe(III) on the surface of the catalyst was reduced to Fe(II) after treatment with ASC. Thus, the role of RAs can be of assistance in Fe(III)/Fe(II) redox cycles on the Fe-Z surface and enhance the generation of HO. via the decomposition of H2O2. (C) 2013 Elsevier B.V. All rights reserved.
Type: article (author version)
URI: http://hdl.handle.net/2115/54813
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 福嶋 正巳

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