Past Events

Abstract
 

Black TiO2@TiO2, as a metal-oxide photocatalyst for the removal of water pollutants, has been extensively studied due to its excellent catalytic activity, chemical stability, minor toxicity and low cost. However, the synthesis of black TiO2 still involves complex wet-chemistry methods, high energy-consumption processes and long-time post treatments. Also, few works have demonstrated the realization of black TiO2 grown on materials other than TiO2. Herein, a new one-step approach, atomic layer deposition (ALD), is presented to synthesize black TiO2 on various metal oxides (TiO2, SnO2 or ZnO) as core/shell heterojunctions showing high photo-activity. In-situ XPS was utilized to reveal the degradation mechanism. The intrinsic centers Ti3+ defects formed in the heterojunction interface or surface can significantly enhance the photocatalytic activity. It provides a new and promising path for the synthesis of metal-oxide heterojunction photocatalyst to the clean environment.

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