Abstract
TiO2–WO3 composite crystallites were prepared by a one-pot synthesis via hydrothermal reaction using Ti(SO4)2 and Na2WO4·2H2O as source materials. The samples were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS) methods. Results reveal that the WO3 particles are uniformly dispersed on the surface of TiO2 particles without any detectable change in crystal structure and morphology of the TiO2–WO3 composite nanocrystallites. Corresponding photocatalytic properties of the pure TiO2 and TiO2–WO3 crystallites are found to increase first and then decrease with increasing W/Ti molar ratios. The sample with a W/Ti molar ratio of 1:99 shows the highest photodegradation rate (95.8%) for Rhodamine B under natural sunlight irradiation.
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