Kinetic research on electrochemical reduction of ferrihydrite mediated by anthraquinone organic matter
ZHA Xue-cong, ZHU Wei-huang, WANG Shan-lin, ZOU Zhen
Shaanxi Key Laboratory of Environmental Engineering, Northwest China Key Laboratory of Water Resources and Environment Ecology, Ministry of Educa-ation Xi'an University of Architecture and Technology, Xi'an 710055, China
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 (AQSoxi) concentration (CAQSoxi) showed a typical characteristic of function model curve derived from consecutive reactions. As the reaction time (t) increased, CAQSoxi grew rapidly in the initial stage; and subsequently, when reaction time (t) reached a certain level, CAQSoxi had experienced rapidly declines to various degrees, and the Adj.R2 in the fitted model could be high enough to 0.9990.
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ZHA Xue-cong, ZHU Wei-huang, WANG Shan-lin, ZOU Zhen. Kinetic research on electrochemical reduction of ferrihydrite mediated by anthraquinone organic matter. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 2000-2006.
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