Photophysical and photocatalytic properties of molybdates and tungstates with a scheelite structure were investigated. The band gaps of scheelite compounds narrowed when the compounds were composed of Ag+ and Bi3+ ions. (NaBi)0.5MoO4 (BG: 3.1 eV) and (AgBi)0.5MoO4 (BG: 3.0 eV) showed the photocatalytic activities for O2 evolution from an aqueous solution containing an electron acceptor. On the other hand, (NaBi)0.5WO4 (BG: 3.5 eV) produced H2 from an aqueous solution containing an electron donor.
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Kato et al. (2004) studied this question.
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