Graphite Supported Stainless-Steel Electrode for the Degradation of Azo Dye Orange G by Fenton Reactions: Effect of Photo-Irradiation
Publication: Journal of Environmental Engineering
Volume 145, Issue 1
Abstract
An electrode, stainless steel supported on graphite, was used for the degradation of hazardous organic compounds, azo dye Orange G (OG), using the photoelectro- Fenton (PEF) process. Results showed that the applied current controlled the electrogeneration rate of both ferrous ion and hydrogen peroxide, which in turn affected the dye degradation kinetics. At an applied current density of , the SS-graphite electrode yielded a molar ratio of 3.6, which was optimal for dye degradation. Under otherwise identical conditions, UV irradiation significantly enhanced OG degradation, i.e., PEF is more effective than electro-Fenton (EF) process. At the optimal applied current density of , or optimal molar of 3.6, OG decolorization and total organic carbon removal were 83% (in 3 h) and 55% (in 7 h), versus 75% (in 3 h) and 20% (in 7 h) by PEF and EF, respectively. OG degradation by both PEF and EF processes followed the pseudo first-order kinetics, which suggested the major role of OH radical in OG decolorization.
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Acknowledgments
The financial support of this work by the Technology Development Program (101-EC-17-A-08-S1-208), Ministry of Economic Affairs of the Republic of China is gratefully acknowledged. Additional support was provided by US NSF IOA (1632899) to CPH.
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Journal of Environmental Engineering
Volume 145 • Issue 1 • January 2019
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©2018 American Society of Civil Engineers.
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Received: Mar 17, 2018
Accepted: Jul 3, 2018
Published online: Nov 14, 2018
Published in print: Jan 1, 2019
Discussion open until: Apr 14, 2019
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