硝酸根电化学还原去除过程阴极电位振荡研究

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Abstract Nitrate has a polyvalent behavior in electrochemical reduction removal process, it is a typical nonlinear system far from equilibrium. To investigate the electrochemical behavior of nitrate during the removal process, the influence of H₂SO₄ concentration, current, reaction temperature and NO₃^- concentration on cathode potential oscillation was systematically studied. The cyclic voltammetry characteristics of the reaction system and the changes of the phase composition, microstructure and surface electron valence state of the cathode Cu surface before and after the reaction were analyzed by cyclic voltammetry, XRD, SEM-EDS and XPS. The results show that the H₂SO₄-NaNO₃ system had obvious potential oscillation under constant current conditions (Pt as anode and Cu as cathode). When concentration of H₂SO₄ and NaNO₃ were separately 0.10, 0.20mol/L, the current 12mA, the temperature 20℃, the oscillation average amplitude was 1.15V and the oscillation average period was 3s. In addition, the periodic potential oscillation of nitrate in the process of electrochemical reduction removal was mainly caused by the continuous dissolution and formation of the dense CuO film on the Cu surface of the cathode, and periodic generation and disappearance of H₂ on cathode surface.

Key words： nitrate removal electrochemical reduction nonlinearity potential oscillation cathode copper electrode

Received: 08 November 2021

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X703

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	Articles by authors
	HU Ling
	WU Yan-xiang
	SHU Jian-cheng
	CHEN Shao-qin
	ZHAO Zhi-sheng
	TANG Jin-jing
	LIU Zuo-hua
	CHEN Meng-jun

Cite this article:

HU Ling,WU Yan-xiang,SHU Jian-cheng等. Potential oscillation of cathode in nitrate electrochemical reduction removal process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2662-2670.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I6/2662

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