A new strategy for determination of current efficiency during electro-oxidation of aromatic compounds in a packed-bed system |
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Authors: | Wang Lizhang Zhao Yuemin Gao Qingyu Qian Cheng Hu Yunlong |
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Affiliation: | School of Environmental Science and Spatial Informatics, China University of Mining and Technology, South Jiefang Road, Quanshan District, Xuzhou City, JiangSU, 221008, P. R. China. wlzh0731@126.com |
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Abstract: | The electro-oxidation of aromatic compounds in 4,4'-diaminostilbene-2,2'-disulfonic (DSD) acid wastewater on IrO2-Ta2O5/Ti anodes was studied. The current efficiency was evaluated in terms of chemical oxygen demand (COD) by introducing a new factor, the fraction of the Faradaic current to the total cell current (beta) through the network analysis of packed bed electrode system (PBEs). Experimental results using an up-flow PBEs at current intensities ranging from 5 to 16 A m(-2), flow rates ranging from 20 to 80 L h(-1) and inter-electrode distance of 5 to 50 cm are in good agreement with the proposed equation. In addition, lower current density, increasing flow rate and larger inter-electrode distance are beneficial to enhance the current efficiency. |
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