Photocatalytic activity for O2 evolution of WO3 prepared through pyrolysis of ammonium paratungstate

A series of WO3 catalysts were obtained through pyrolysis of ammonium paratungstate under different O2/Ar at 700℃. The catalysts were identified by XRD, XPS, DRS measurements, and the photo catalytic activity of WO3 for O2 evolution was studied. The results indicate that with the increasing content of Ar, the oxygen vacancies of WO3 catalysts are increased, the photo catalytic activity for O2 evolution is advanced and the photo catalytic activity of WO3 obtained in pure Ar is the highest. The influence of Fe2+ on photo catalytic activity for O2 evolution was also investigated. The results show that the activity of WO3 is restrained by Fe2+in the photo catalytic reaction with Fe3+as electron acceptor.

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