Abstract
Herein, we report the solar thermal electrochemical process (STEP) aniline oxidation in wastewater for totally solving the two key obstacles of the huge energy consumption and passivation film in the electrochemical treatment. The process, fully driven by solar energy without input of any other energies, sustainably serves as an efficient thermoelectrochemical oxidation of aniline by the control of the thermochemical and electrochemical coordination. The thermocoupled electrochemical oxidation of aniline achieved a fast rate and high efficiency for the full minimization of aniline to CO2 with the stability of the electrode and without formation of polyaniline (PAN) passivation film. A clear mechanism of aniline oxidation indicated a switching of the reactive pathway by the STEP process. Due to the coupling of solar thermochemistry and electrochemistry, the electrochemical current remained stable, significantly improving the oxidation efficiency and mineralization rate by apparently decreasing the electrolytic potential when applied with high temperature. The oxidation rate of aniline and chemical oxygen demand (COD) removal rate could be lifted up to 2.03 and 2.47 times magnification compared to conventional electrolysis, respectively. We demonstrate that solar-driven STEP processes are capable of completely mineralizing aniline with high utilization of solar energy. STEP aniline oxidation can be utilized as a green, sustainable water treatment.
Highlights
On the fast and sustainable oxidation and digestion of passivation film sat the appropriate electrolytic potential
The solar thermal electrochemical process (STEP)[21,22,23] has been demonstrated to work successfully for efficient chemical reactions such as the STEP iron[24], ammonia[25], CO2 capture-to-fuel[26,27], organic synthesis[28,29], and recent STEP coal conversion by using solar thermo- and electrochemistry to minimize the amount of fossil energy required[30], while maximizing the rate of electrolysis reactions by lowering the electrolysis potential.The STEP process and chemistry were detailed in our recent paper[31]
This paper presents the novel solar STEP thermo-electrochemical process for the degradation of aniline wastewater beyond an anodic passivation film for stable and full mineralization
Summary
DandanYuan, Lei Tian, Zhida Li, Hong Jiang, ChaoYan, Jing Dong, Hongjun Wu & Baohui Wang. The results exhibited that the stop of the PAN passivation film or the rapid dissolution substantially lifted the reaction rate and mineralization rate under the combined action of thermochemistry and electrochemistry It was considered a sustainable process for the treatment of the aniline wastewater in both the energy utilization and continuous aniline oxidation without the formation of passivation film. The test of the thermo-dependent cyclic voltammograms (CV) was scanned by using BAS Epsilon-EC electrochemical workstation with three electrode systems including the working electrode and counter electrode of the platinum electrode (10 mm × 10 mm), and the reference electrode of thesaturated calomel electrode (SCE) at a sweep rate of 10 mV/s
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