ZnWO 4 powder photocatalyst was prepared by calcining co-precipitated precursor, and its high photocatalytic activity was revealed. The ZnWO 4 crystal phase was formed at 450 • C for 4 h. The crystal size and particle size of ZnWO 4 powder increased with the increasing of calcination temperature and time. At 500 • C for 4 h, the photocatalyst reaches the highest photocatalytic activity with formaldehyde removal efficiency of 90% within 25 min. Moreover, its photocatalytic activity is almost similar to that of…
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