Cyclic time-separated redox reaction using accumulated electrons in titanium() oxide in a two-phase system

A time-separated redox reaction using accumulated electrons in titanium( iv ) oxide (TiO 2 ) was cyclically repeated in order to increase the amount of the reduction product that has been limited by the saturation value of accumulated electrons in TiO 2 . Repetition of the reaction was carried out by utilizing an organic/aqueous two-phase system and the insolubility of substrates and target products in the aqueous phase. The reaction proceeded by repeating two steps: (1) electron accumulation in TiO 2 at the bottom of the aqueous phase was induced under ultraviolet irradiation with low-speed stirring and (2) reduction by accumulated electrons in the two-phase interface was performed in the dark with high-speed stirring. Results indicated that the amount of the product monotonically increased as a function of the number of repetition cycles. The relationship of the product amount with the physical and chemical properties of TiO 2 is discussed. A time-separated redox reaction using accumulated electrons in TiO 2 was cyclically repeated in order to increase the amount of the reduction product that has been limited by the saturation value of accumulated electrons in TiO 2 .