Oxidation of multicarbon compounds to CO2 by photocatalysts with energy storage abilities.

Photocatalysts can be used for removal of harmful or odorous organic compounds, but only under illumination. We previously developed a TiO2/Ni(OH)2 photocatalyst with an oxidative energy storage ability, and used it for oxidation of monocarbon compounds such as methanol and formaldehyde to CO2 by the stored energy. Here, we report that TiO2/Ni(OH)2 charged with oxidative energy can also oxidize multicarbon compounds such as acetaldehyde, acetic acid and acetone to CO2 even in the dark. We also report that MnOx can be used as an oxidative energy storage material if it is not in direct contact with the TiO2 photocatalyst (e.g. TiO2/nanoporous SiO2/MnOx). Photocatalytically charged MnOx can also oxidize methanol, acetaldehyde, acetic acid and acetone to CO2.