title: Sono-advanced Fenton decolorization of azo dye Orange G: Analysis of synergistic effect and mechanisms.
abstract: In this study, a successful decolorization of Orange G was achieved by means of coupling zero valent iron (ZVI), H2O2 and ultrasound (US) under acidic pH conditions. The synergistic effect and characterization of potential roles of the factors including ZVI, tert-Butanol as radical scavenger, dissolved ferrous ions and H2O2 generated from sonication were evaluated in this sono-advanced Fenton process (SAFP) system. A clear synergy was evident in terms of decolorization rate and the TOC removal as the input of US enhanced the activity of the Fe(0)/H2O2 system. The results suggested that the ZVI was potential replacement for the Fe(2+) ion. This remarkable activity was attributed to the capacity of Fe(2+) formed and reduction of sonic-dissolved Fe(2+) concentration by the formation of {Fe·Fe(2+)}. The modification of the condition of H2O2 addition such as the dosage and input method showed significant variations in terms of decolorization rate. This result indicated that the optimal external addition of H2O2 and input method is a limited factor of decolorization rate due to its comparatively insufficient generated by ultrasound.
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035, China.
authors.forename: Meiqiang
authors.initials: M
authors.lastname: Cai
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Su
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035, China.
authors.forename: Guanghu
authors.initials: G
authors.lastname: Lian
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035, China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Wei
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035, China. Electronic address: dcy0915@126.com.
authors.forename: Chunying
authors.initials: C
authors.lastname: Dong
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310035, China.
authors.forename: Haojie
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Zhejiang Provincial Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China; Ningbo Key Laboratory of Poison Research and Control, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China. Electronic address: jmcjc@163.com.
authors.forename: Micong
authors.initials: M
authors.lastname: Jin
authors.affiliation: Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, United States.
authors.forename: Zongsu
authors.initials: Z
authors.lastname: Wei
keywords: Azo dye; Decolorization rate; Synergistic effect; Ultrasound; Zero valent iron