蒽醌类有机质介导水铁矿电化学还原的动力学

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Abstract

The current study mainly discussed the electrochemical reduction of ferrihydrite mediated by anthraquinone (AQS) in the "electrode-AQS-ferrihydrite" reaction system, and the kinetic characteristics and mechanism of the interaction. Compared with ordinary glassy carbon electrode, the sensitivity of the electrochemical reduction reaction occurring on the surface of the carbon felt electrode had been significantly improved under ultrasonic opening condition. When the applied voltage was -0.7V (vs Ag/AgCl), AQS could be completely reduced. On the optimal experimental conditions, AQS could participate in the electrochemical reduction process of ferrihydrite as a redox mediator. When the amount of AQS increased from 0.005mmol/L to 0.035mmol/L, the reduction ratio of the absolute amount of ferrihydrite rose from 10.4% to 35%. The time course of the intermediate product (AQS_oxi) concentration (C_AQSoxi) showed a typical characteristic of function model curve derived from consecutive reactions. As the reaction time (t) increased, C_AQSoxi grew rapidly in the initial stage; and subsequently, when reaction time (t) reached a certain level, C_AQSoxi had experienced rapidly declines to various degrees, and the Adj.R² in the fitted model could be high enough to 0.9990.

Key words： ferrihydrite mediated electrochemical reduction organic matter kinetic characteristics

Received: 26 October 2018

PACS:

X131

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	Articles by authors
	ZHA Xue-cong
	ZHU Wei-huang
	WANG Shan-lin
	ZOU Zhen

Cite this article:

ZHA Xue-cong,ZHU Wei-huang,WANG Shan-lin等. Kinetic research on electrochemical reduction of ferrihydrite mediated by anthraquinone organic matter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 2000-2006.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I5/2000

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