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Received January 25, 2017
Accepted March 3, 2017
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Controlled release of iron for activation of persulfate to oxidize orange G using iron anode
1Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Korea 2Department of Bioactive Material Sciences, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Korea
kbaek@jbnu.ac.kr
Korean Journal of Chemical Engineering, May 2017, 34(5), 1305-1309(5), 10.1007/s11814-017-0062-9
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Abstract
Persulfate (PS) can be activated by transition metal to generate a sulfate radical and oxidize persistent organic pollutants. However, activation with excessive Fe(II) causes unnecessary self-degradation of PS. In this study, Fe(II) was slowly and continuously injected electrochemically using an iron anode to minimize the self-degradation of PS. Additionally, reaction rate was controlled by adjusting the current intensity applied to the system. Total organic carbon (TOC) was analyzed as an indicator of complete mineralization because the model pollutant, orange G (OG), produced secondary pollutants after disruption of the azo bonds. The removal rate of TOC was 1/10-th of that for OG. In addition, the effect of molar ratio of OG and PS was also studied to confirm the complete mineralization of OG.
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Baek K, Ciblak A, Mao XH, Kim EJ, Alshawabkeh A, Water Res., 47, 6538 (2013)
