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Issue
Korean Journal of Chemical Engineering,
Vol.28, No.5, 1299-1303, 2011
Microwave synthesis of mesoporous WO3 doping with bismuth and photocatalytic oxidation of water to H2
Zou L, Liu Q, Xu Q, Mi G
Mesostructured tungstic acid was prepared from Na2WO4 with protonated cation-exchange using a surfactant cetyltrimethyl ammonium bromine (CTAB) as the structure-directing agent under microwave radiation. The surfactant was removed by high-temperature calcination, microwave radiation extraction and Soxhlet extraction, respectively. The effects of these methods for removal of the surfactant were investigated in detail. XRD, TEM, FT-IR and UV-Vis were employed to characterize the mesostructured materials. The results showed that the microwave extraction and Soxhlet extraction were favorable to the synthesis of mesostructured tungstic oxide. Mesoporous structure was destroyed as the calcining temperature rising to 823 K. The mesoporous structure of WO3 prepared by microwave radiation extraction had an average pore diameter of 3.4 nm and specific surface area of 120.46m2·g.1. And also, the mesoporous materials WO3 doping with Bi2O3 displayed much higher photocatalytic activity than commercial Degussa P25 TiO2 under visible light and UV irradiation.
Keywords: Mesoporous WO3; Microwave Radiation; Microwave Extraction; Photocatalytic Activity
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