Solar-driven highly thermal electrochemical oxidation in the temperature of more than 100 °C for sustainable treatment of organic pollutants in wastewater

Chunhong Nie, Huan Du, Qingyun Li, Jiawen Ni, Dandan Yuan, Yuhan Chen, Baohui Wang and Xirui Wang

Renewable Energy, 2020, vol. 147, issue P1, 2171-2178

Abstract: A solar-driven highly thermal electrochemical oxidation is introduced and demonstrated for a sustainable treatment of organic pollutants in wastewater, exemplified by methyl red dye. Utilizing both solar thermal and electric action on induction of thermo- and electrochemical reaction, the organic pollutants in wastewater are efficiently electrooxidized under an activation chemistry of the high temperature. Meanwhile, the overall solar utilization is greatly enhanced by the input of a majority of heat dominated the solar utilization. The cyclic voltammetry (CV) curves indicate two oxidation processes at temperatures lower than 100 °C, while only one oxidation wave presents at temperatures above 100 °C, and the oxidation potentials also decrease compared with the conventional electrolysis. The solar oxidation demonstrates that the rate of methyl red oxidation is enhanced by 92.68% at 200 °C compared to 29.31% at 20 °C. The mechanism presents that solar heat is provided to activate reactant molecules, which reduces the electrolysis potential and allow energetically forbidden oxidation to occur easily. This study opens a new avenue for efficient solar utilization and sustainable wastewater treatment.

Keywords: Solar energy; Highly thermal electrochemical process; Organic pollutants; Methyl red (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:147:y:2020:i:p1:p:2171-2178

DOI: 10.1016/j.renene.2019.10.019

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