Abstract
Titanium dioxide is broadly used as a catalyst for photochemical reactions. In this work, nanometric particles of CdS (a narrow band gap semiconducting material) were used to impregnate TiO 2 in order to optimize its photocatalytic properties. CdS/TiO 2 semiconductor composites were obtained in 1, 3, 5 and 20 mol% proportion and characterized by differential thermogravimetric analysis (DTG), X-ray diffraction (XRD), laser-induced fluorescence (LIF) and resonance Raman spectroscopy. The results identified the CdS in hexagonal geometry and the TiO 2 in anatase form. Resonance Raman spectroscopy data revealed a lattice softening of the TiO 2-anatase phase due to electronic interaction between TiO 2 and CdS in the CdS/TiO 2 catalyst. The effect of modifying the proportion of CdS in the catalyst electronic properties and efficiency was also studied. The photocatalytic activity of the CdS/TiO 2 was investigated using artificial UV light for degradation of the textile azo-dye Drimaren red. The photocatalytic analysis revealed better efficiency for the CdS/TiO 2 5% composite as compared with other CdS/TiO 2 proportions and with TiO 2 alone.
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