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Oxidative degradation of azo dye by hydrogen peroxide electrogenerated in situ on anthraquinonemonosulphonate/polypyrrole composite cathode with heterogeneous CuO/gamma-Al(2)O(3) catalyst

Authors Zhang, Guoquan
Wang, Shuai
Zhao, Sha
Fu, Lei
Chen, Guohua View this author's profile
Yang, Fenglin
Issue Date 2011
Source Applied catalysis. B, Environmental , v. 106, August 2011, p. 370-378
Summary Heterogeneous electrocatalytic wet H(2)O(2) oxidation technique for the removal of azo dye amaranth from aqueous solution was studied in the presence of solid CuO/gamma-Al(2)O(3) catalyst and anthraquinonemonosulphonate/polypyrrole (AQS/PPy) composite cathode able to electrogenerate H(2)O(2) in situ. The spherical CuO/gamma-Al(2)O(3) catalysts with various CuO loadings and calcined at different temperatures were characterized by BET, ESEM-EDS, XRD and XPS. Several parameters affecting H(2)O(2) electrogeneration and dye degradation such as solution pH, cathode potential (E(ca)), oxygen flow rate (V(O2)), CuO loading, reaction temperature as well as catalyst calcination temperature were investigated. Experimental results revealed that the optimal condition for H(2)O(2) electrogeneration on the AQS/PPy composite modified cathode is V(O2) = 0.4 ml min(-1), E(ca) = 0.4V and pH 4.3. On this occasion, ca. 90% chroma decay and 60% TOC removal of dye were achieved with 450 degrees C-calcined 5.78 wt%-CuO/gamma-Al(2)O(3) catalyst and 70 degrees C reaction temperature. Dye degradation follows the second-order kinetics. Leaching tests showed that the leaching copper amount during the oxidation is only 4.0-7.0% per run and the role of heterogeneous activity is dominant. The catalytic activity of CuO/gamma-Al(2)O(3) catalyst could be recovered after multiple runs by a re-calcination step. Furthermore, the stability of the AQS/PPy composite after consecutive operation was also investigated by chronoamperometric and EIS techniques. (C) 2011 Elsevier B.V. All rights reserved.
ISSN 0926-3373
Language English
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