Catalytic And Photocatalytic Degradation Of Ozone Via Utilization Of Controllable Nano-ag Modified On Tio_2

摘要

To resolve increasing ozone pollution, nano-silver-anchored titanium dioxide (nano-Ag/TiO_2), with a controllable diameter, synthesized by a photoreduc-tion method, for ozone degradation is presented in this study.rnIn the presence of ultraviolet (UV) irradiation, the nano-Ag/TiO_2 catalyst exhibited high efficiency for ozone degradation, at ～98-99% for all experiments. However, the efficiency of pure TiO_2 for ozone degradation rapidly dropped and became inefficient after 160 min. This is because ozone oxidized the surface of TiO_2 and formed an oxidative layer on the TiO_2 surface; then the photocatalytic ability of the re-oxidized TiO_2 for ozone degradation was greatly reduced. The results also indicated that ozone was effectively degraded via the nano-Ag/TiO_2 catalyst even without UV irradiation. The catalytic performance of nano-Ag/TiO_2 for ozone degradation was enhanced by reducing the diameters and by effectively dispersing the Ag nanoparticles. In addition, the photocatalytic ozone degradation via nano-Ag/ TiO_2 revealed no decay at a relative humidity of 70% during the experimental period, and maintained excellent performance compared with that of pure TiO_2.