Synthesis and Characterization of WO/CeO Heterostructured Nanoparticles for Photodegradation of Indigo Carmine Dye.

WO/CeO heterostructured nanocomposites containing different WO ratios (0.1, 0.3, 0.5, and 1.0 wt %) were synthesized by a precipitation method. The coupling of CeO and WO with a high specific surface area noticeably enhanced the photocatalytic activity of indigo carmine (IC) degradation under visible-light irradiation. The degradation rate constants () of 0.5 wt % WO/CeO nanocomposites reached 4 and 5 times higher than those of CeO and WO, respectively. Regarding the experimental results, the X-ray diffraction (XRD) patterns of the CeO spherical nanoparticles and rod-shaped WO were assigned to the cubic fluorite and orthorhombic phase structures, respectively. The increasing photocatalytic activity of nanocomposite samples could be attributed to the heterojunction of the photocatalysts with efficient charge separation and strong oxidative ability, which were confirmed by the photoluminescence spectra and diffuse reflectance spectrometry. The staggered heterojunction of the nanocomposite promoted efficient electron transfer and suppressed the recombination of photogenerated electrons and holes during the process.