Journal
ELECTROCHIMICA ACTA
Volume 81, Issue -, Pages 227-232Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.07.045
Keywords
Tungstates; Co-precipitation; Heterogeneous photocatalysis; Quasi-Fermi potential
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Funding
- CONACYT [178895, 167018]
- SEP-PROMEP [UANL-PTC-590]
- Spanish Government [CTQ2008-00178]
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Transition metal tungstates with general formula M2+WO4 (M2+ = Co, Cu, Mn and Ni) were synthesized by the co-precipitation method at 400 C. The prepared powders were characterized by X-ray powder diffraction (XRD), nitrogen adsorption-desorption isotherms and photoelectrochemical measurements. The quasi-Fermi potentials of electrons determined at pH 7 were -0.67, -0.54, -0.21 and -0.18 V (vs. NHE) for CoWO4, CuWO4, MnWO4 and NiWO4, respectively. Photodegradation of methanol and 4-chlorophenol was used to evaluate the photoactivity of the tungstate oxides under visible-light irradiation. The CuWO4 powders showed the best mineralization yields (about 12% for methanol after 25 h, and 23% for 4-chlorophenol after 6 h of irradiation). These results show the feasibility of organic photocatalytic mineralization using CuWO4. (c) 2012 Elsevier Ltd. All rights reserved.
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