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Evaluation of anode materials in sonoelectrochemistry processes: Kinetic, mechanism, and cost estimation

Authors
Zhou, YongyueCui, MingcanRen, YangminLee, YonghyeonMa, JunjunHan, ZhengchangKhim, Jeehyeong
Issue Date
11월-2022
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Ultrasound; Electrochemical; Pentachlorophenol; Selection; Anode material; Groundwater
Citation
CHEMOSPHERE, v.306
Indexed
SCIE
SCOPUS
Journal Title
CHEMOSPHERE
Volume
306
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142711
DOI
10.1016/j.chemosphere.2022.135547
ISSN
0045-6535
Abstract
Eco-friendly pollutant treatment technology has a developing tendency in future. The combination of ultrasound (US) and electrochemical (EC) is a promising technology, because they are efficient, clean and environmentally friendly. In this study, the impacts of anode material have been investigated in US (300 kHz) and EC (10V) system. The results of all systems revealed that the kinetic constant decreased with increasing pH. The results are also shown that Delta G# > 0 and Delta H# > 0 during PCP degradation in EC or US-EC systems are non-spontaneous and endothermic reactions. Meanwhile, in the US-EC system, TiO2, Ti4O7, PbO2, SnSb, RuIr, and BDD, except for TiO2, all the anode materials showed a synergistic index (SI) of 106-197%, and the activation energies were 19.32, 33.4, 33.74, 32.84, 10.41, 36.44 kJ mol-1, respectively. In EC and US-EC systems, PCP can be completely mineralized by BDD anode within 30 min. TBA scavenger experiments verified that hydroxyl radicals were the main oxidant in each system using BDD and PbO2 anode. As a result of estimating the cost according to the anode material when removing PCP using the EC or US-EC system, BDD was the smallest in the two systems, 1.58 and 1.12 $ m- 3, respectively. Finally, this study may serve as a reference for implementation of US-EC system in wastewater treatment.
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Khim, Jee hyeong
공과대학 (건축사회환경공학부)
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