An Integrated Electrochemical System for Synergistic Cathodic Nitrate Reduction and Anodic Sulfite Oxidation

被引:1
|
作者
Cui, Bing [1 ]
Wang, Shizhao [1 ]
Guo, Xiaofu [1 ]
Zhao, Yingying [1 ]
Rohani, Sohrab [2 ]
机构
[1] Hebei Univ Technol, Hebei Collaborat Innovat Ctr Modern MarineChem Tec, Engn Res Ctr Seawater Utilizat, Sch Chem Engn & Technol,Minist Educ, Tianjin 300130, Peoples R China
[2] Western Univ, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada
来源
MOLECULES | 2023年 / 28卷 / 12期
关键词
electrochemical; integrated system; nitrate reduction; sulfite oxidation; EFFICIENT; REMOVAL;
D O I
10.3390/molecules28124666
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Electrochemical reduction of nitrate has broad application prospects. However, in traditional electrochemical reduction of nitrate, the low value of oxygen produced by the anodic oxygen evolution reaction and the high overpotential limit its application. Seeking a more valuable and faster anodic reaction to form a cathode-anode integrated system with nitrate reaction can effectively accelerate the reaction rate of the cathode and anode, and improve the utilization of electrical energy. Sulfite, as a pollutant after wet desulfurization, has faster reaction kinetics in its oxidation reaction compared to the oxygen evolution reaction. Therefore, this study proposes an integrated cathodic nitrate reduction and anodic sulfite oxidation system. The effect of operating parameters (cathode potential, initial NO3--N concentration, and initial SO32--S concentration) on the integrated system was studied. Under the optimal operating parameters, the nitrate reduction rate in the integrated system reached 93.26% within 1 h, and the sulfite oxidation rate reached 94.64%. Compared with the nitrate reduction rate (91.26%) and sulfite oxidation rate (53.33%) in the separate system, the integrated system had a significant synergistic effect. This work provides a reference for solving nitrate and sulfite pollution, and promotes the application and development of electrochemical cathode-anode integrated technology.
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页数:14
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