The photocatalytic performance of cesium tungsten oxide particles under visible-light irradiation and preparation using a glycothermal process

This study investigated the role of cesium tungsten oxide particles in the photocatalytic degradation of dyes under visible-light irradiation. A cesium tungsten oxide compound with c-CsW1.6O6 particles was prepared by rapidly mixing ethylene glycol with ammonium tungstate parapentahydrate ((NH4)10W12O41 center dot 5H2O) and cesium nitrite (CsNO3) and heated at 120 degrees C for 1 h as part of the glycothermal process. Results indicated that the cesium tungsten oxide particles had a low band gap and generated holes (h(+)) and electrons (e(-)), which subsequently produced O-2(center dot-) and (HO)-H-center dot that degraded the methylene blue (MB) dye under visible-light irradiation. This study determined that the c-CsW1.6O6 structure of the 200 degrees C-calcined particles exhibited the best photocatalytic degradation of MB. The polymorphous structures of cesium tungsten oxide particles calcined at 400 degrees C or higher temperatures exhibited poor photocatalytic degradation of MB. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.