有機無機ハイブリッド光触媒による過酸化水素生成

抄録

The author designed an organic-inorganic hybrid photocatalyst for production of hydrogen peroxide (H₂O₂) by using water as an electron source. The organic-inorganic hybrid photocatalyst was prepared by immobilizing diprotonated dodecaphenylporphyrin (H₄DPP²⁺) derivatives as a selective reduction catalyst of O₂ having carboxyl groups to be anchored to the surface of TiO₂ as an oxidation photocatalyst of water. The H₄DPP²⁺-TiO₂ hybrid photocatalyst dispersed in pure water was irradiated at 365 nm LED lamp under air. Formation of H₂O₂ was confirmed by iodometry of the supernatant and the amount of H₂O₂ was determined to be 0.3 mM for 1 min photoirradiation. Thus, the H₄DPP²⁺-TiO₂ hybrid photocatalyst performs water oxidation at the TiO₂ surface and selective two-electron reduction of O₂ at the H₄DPP²⁺ moiety, respectively.