Abstract

Silica pillared-niobates were prepared from a, so called, layered perovskite, KCa 2Nb 3O 10, by using alkylammonium ions as swelling reagents.A product with the interlayer spacing expanded by ca. 1.2 nm and the BET surface area of ca. 200 m 2/g was obtained when an octylammonium intercalated precursor was used. The photocatalytic activities of these silica pillared-niobates were compared with those of the original KCa 2Nb 3O 10 and the proton-exchanged derivative. It was revealed that silica pillared-niobates showed a high and characteristic photocatalytic activity.

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