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Maximization of current efficiency for organic pollutants oxidation at BDD, Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb anodes.
Chemosphere. 2018 Aug; 205:361-368.C

Abstract

Whereas electrochemical oxidation is noted for its ability to degrade bio-refractory organics, it has also been incorrectly criticized for excessive energy consumption. The present paper rectifies this misunderstanding by demonstrating that the energy actually consumed in the degradation process is much less than that wasted in the side reaction of oxygen evolution. To minimize the side reaction, the possible highest instantaneous current efficiency (PHICE) for electrochemical oxidation of phenol at Boron-doped Diamond (BDD), Ti/SnO2-Sb/PbO2 (PbO2), and Ti/SnO2-Sb (SnO2) anodes has been investigated systematically, and found to reach almost 100% at the BDD anode compared with 23% at the PbO2 anode and 9% at the SnO2 anode. The significant discrepancy between PHICE values at the various anodes is interpreted in terms of different existing forms of hydroxyl radicals. For each anode system, the PHICEs are maintained experimentally using a computer-controlled exponential decay current mode throughout the electrolysis process. For applications, the minimized energy consumption is predicted by response surface methodology, and demonstrated for the BDD anode system. Consequently, almost 100% current efficiency is achieved (for a relatively meagre energy consumption of 17.2 kWh kgCOD-1) along with excellent COD degradation efficiency by optimizing the initial current density, flow rate, electrolysis time, and exponential decay constant. Compared with galvanostatic conditions, over 70% of the energy is saved in the present study, thus demonstrating the great potential of electrochemical oxidation for practical applications.

Authors+Show Affiliations

College of Life and Environmental Science, Minzu University of China, Beijing 100081, China. Electronic address: xingxuanpku@163.com.State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China; Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China. Electronic address: nijinren@iee.pku.edu.cn.Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29704843

Citation

Xing, Xuan, et al. "Maximization of Current Efficiency for Organic Pollutants Oxidation at BDD, Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb Anodes." Chemosphere, vol. 205, 2018, pp. 361-368.
Xing X, Ni J, Zhu X, et al. Maximization of current efficiency for organic pollutants oxidation at BDD, Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb anodes. Chemosphere. 2018;205:361-368.
Xing, X., Ni, J., Zhu, X., Jiang, Y., & Xia, J. (2018). Maximization of current efficiency for organic pollutants oxidation at BDD, Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb anodes. Chemosphere, 205, 361-368. https://doi.org/10.1016/j.chemosphere.2018.04.090
Xing X, et al. Maximization of Current Efficiency for Organic Pollutants Oxidation at BDD, Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb Anodes. Chemosphere. 2018;205:361-368. PubMed PMID: 29704843.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Maximization of current efficiency for organic pollutants oxidation at BDD, Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb anodes. AU - Xing,Xuan, AU - Ni,Jinren, AU - Zhu,Xiuping, AU - Jiang,Yi, AU - Xia,Jianxin, Y1 - 2018/04/17/ PY - 2017/12/12/received PY - 2018/02/28/revised PY - 2018/04/16/accepted PY - 2018/4/29/pubmed PY - 2018/8/23/medline PY - 2018/4/29/entrez KW - Electrochemical oxidation KW - Energy saving KW - Exponential decay current mode KW - Possible highest instantaneous current efficiency KW - Response surface methodology SP - 361 EP - 368 JF - Chemosphere JO - Chemosphere VL - 205 N2 - Whereas electrochemical oxidation is noted for its ability to degrade bio-refractory organics, it has also been incorrectly criticized for excessive energy consumption. The present paper rectifies this misunderstanding by demonstrating that the energy actually consumed in the degradation process is much less than that wasted in the side reaction of oxygen evolution. To minimize the side reaction, the possible highest instantaneous current efficiency (PHICE) for electrochemical oxidation of phenol at Boron-doped Diamond (BDD), Ti/SnO2-Sb/PbO2 (PbO2), and Ti/SnO2-Sb (SnO2) anodes has been investigated systematically, and found to reach almost 100% at the BDD anode compared with 23% at the PbO2 anode and 9% at the SnO2 anode. The significant discrepancy between PHICE values at the various anodes is interpreted in terms of different existing forms of hydroxyl radicals. For each anode system, the PHICEs are maintained experimentally using a computer-controlled exponential decay current mode throughout the electrolysis process. For applications, the minimized energy consumption is predicted by response surface methodology, and demonstrated for the BDD anode system. Consequently, almost 100% current efficiency is achieved (for a relatively meagre energy consumption of 17.2 kWh kgCOD-1) along with excellent COD degradation efficiency by optimizing the initial current density, flow rate, electrolysis time, and exponential decay constant. Compared with galvanostatic conditions, over 70% of the energy is saved in the present study, thus demonstrating the great potential of electrochemical oxidation for practical applications. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/29704843/Maximization_of_current_efficiency_for_organic_pollutants_oxidation_at_BDD_Ti/SnO2_Sb/PbO2_and_Ti/SnO2_Sb_anodes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)30739-2 DB - PRIME DP - Unbound Medicine ER -