Preparation of Silica Pillared Ca_2Nb_3O_(10)and Its Photocatalytic Activity

摘要

Silica pillared Ca_2Nb_3O_(10) was prepared from the layered perovskite KCa_2Nb_3O_(10) via alkylammonium ion intercalated Ca_2Nb_3O_(10). The obtained materials were characterized by XRD, TEM, NMR, and BET measurements. The interlayer spacing increased in parallel with the length of the alkyl chain of intercalated alkylamines although the BET surface area was not reflected in this increase. The photocatalytic activity of the silica pillared Ca_2Nb_3O_(10) was studied for H_2 evolution from aqueous alcohol solutions. Marked increase by ca. 30 times in activity was obtained for silica pillared Ca_2Nb_3O_(10) compared with the original HCa_2Nb_3O_(10) in an aqueous propanol or butanol solution, while no difference was observed in an aqueous methanol solution. The result was interpreted in terms of the intercalation of the reactant alcohol molecules into the interlayer space.