Low silver loaded biphase of TiO2 microrods with TiO2(B)/anatase and their photocatalytic and antibacterial properties
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The TiO 2 microrods (TiO 2 MRs) with TiO 2 (B)/anatase biphase heterojunctions were synthesized through hydrolyzing of precursor K 2 Ti 4 O 9 and calcining of hydrated H 2 Ti 4 O 9 . An optimized amount of silver nanoparticles (AgNPs) loaded on TiO 2 MRs (Ag/TiO 2 MRs) was obtained via solvent evaporation followed by thermal reduction . The photocatalytic degradation rates reached 81.34% for MB over TiO 2 MRs, and 99.81% for RhB over Ag/TiO 2 MRs within 30 minutes under ultraviolet (UV) radiation, which demonstrated that TiO 2 (B)/anatase heterojunctions and Ag-TiO 2 Schottky Barrier markedly enhanced the photocatalytic activity owing to effective separation of photogenerated carriers. Additionally, the scavenger experiments revealed that photoexcited holes (h + ), superoxide (O 2 • − ) and hydroxyl (HO•) radicals were actively involved in the photodegradation of RhB. Furthermore, the slightly improved RhB catalytic degradation rates for Ag/TiO 2 MRs under xenon lamp demonstrated the surface plasmon resonance effect generated from AgNPs. Besides, the well-dispersed AgNPs could act as a controlled-release silver ion reservoir , providing sustained antibacterial activity in the dark.
