Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 84, Issue 3-4, Pages 699-705Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2008.06.006
Keywords
Sn4+ containing LDHs; ZnO/SnO2 systems; Charge separation; Photocatalysis; Methyl orange
Funding
- NoE
- Special Fund for Research of the University of Antwerp
- CEEX [1/S1/2005]
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Sn4+-containing LDH was prepared using the co-precipitation method at constant pH, and characterized using X-ray diffraction, UV-vis diffuse reflectance spectroscopy and TG/DTG methods. The obtained product was further exposed to different thermal treatments in order to obtain nano-sized coupled ZnO/SnO2 systems with enhanced photocatalytic performances than the ones obtained by mixing the two semiconductor oxides. The formation of a well-defined ZnO/SnO2 system and the crystallite size, fully investigated using XRD, micro-Raman scattering and UV-vis DR techniques, were found to be influenced by the nature of the precursors and the calcination temperature. The photocatalytic activity of the ZnO/SnO2 systems, evaluated for the photodegradation of methyl orange (MO) dye, was studied as a function of the initial pH, catalyst loading and the calcination temperature. The metal dispersion supplied by layered structures proved to be an advantage when preparing coupled ZnO/SnO2 systems, the photocatalytic activity being similar to 2.3 times higher comparing with the physical mixtures performances. The maximum photocatalytic activity of the coupled ZnO/SnO2 system having a layered precursor was observed when using neutral pH, at a catalyst loading of 1 g/L calcined at 600 degrees C for 4 h. (C) 2008 Elsevier B.V. All rights reserved.
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