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In the present study, nanocrystalline photocatalyst Bi 2 O 3 powders with various ZnO additions were synthesized by spray pyrolysis at 600 (SP600) and 700°C (SP700). The Bi 2 O 3 powder converted from a monoclinic α phase to a tetragonal β phase at pyrolysis temperatures ≥600°C. The crystallinity of the SP powder increased with the increase in pyrolysis temperature...