A novel visible-light-responsive photocatalyst Ag 2 CO 3 was prepared by a facile precipitation reaction between NaHCO 3 and AgNO 3 . The as-prepared samples showed relatively high photocatalytic activity toward rhodamine B (RhB) degradation in aqueous solution. The observed photoreactivity on Ag 2 CO 3 was attributed to the synergetic effects of small band gap, great oxidation potential of photogenerated holes, and high separation efficiency of photogenerated electrons and holes. Nevertheless, Ag 2 CO 3 was unstable under visible light due to the photocorrosion resulting from metallic silver formation. The photocorrosion of Ag 2 CO 3 can be efficiently inhibited by adding AgNO 3 in the photocatalytic reaction system owing to the lower electrode potential of Ag/AgNO 3 than that of Ag/Ag 2 CO 3 . Our results shed new light on the photocatalytic activity as well as photocorrosion mechanism of silver-containing compounds and inhibit the method of photocorrosion.
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Dai et al. (2012) studied this question.
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