Add time:08/19/2019 Source:sciencedirect.com
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•5H2O) and cesium nitrite (CsNO3) and heated at 120 °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 O2•− and •HO that degraded the methylene blue (MB) dye under visible-light irradiation. This study determined that the c-CsW1.6O6 structure of the 200 °C-calcined particles exhibited the best photocatalytic degradation of MB. The polymorphous structures of cesium tungsten oxide particles calcined at 400 °C or higher temperatures exhibited poor photocatalytic degradation of MB.
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