Abstract
Over the last decade, interest in the utilization of solar energy for photocatalysis treatment processes has taken centre-stage. Researchers had focused on doping TiO2 with SiO2 to obtain an efficient degradation rate of various types of target pollutants both under UV and visible-light irradiation. In order to further improve this degradation effect, some researchers resorted to incorporate plasmonic metal nanoparticles such as silver and gold into the combined TiO2-SiO2 to fully optimize the TiO2-SiO2’s potential in the visible-light region. This article focuses on the challenges in utilizing TiO2 in the visible-light region, the contribution of SiO2 in enhancing photocatalytic activities of the TiO2-SiO2 photocatalyst, and the ability of plasmonic metal nanoparticles (Ag and Au) to edge the TiO2-SiO2 photocatalyst toward an efficient solar photocatalyst.
Highlights
The first breakthrough in producing the photocatalytic effect of TiO2 was reported by FujishimaHonda in 1972, in which, photosplitting of water in the presence of TiO2 was achieved
The increased band gap in TiO2-SiO2 indicates that the electrons and holes possess stronger reduction (Kibombo et al, 2012) and oxidation abilities and these abilities enhance the photocatalytic activity of the TiO2-SiO2 photocatalyst in visible region
Irradiated with UV 500 W medium pressure Hg lamp with 1.3 mW cm−2, 74 μM concentration of 2-propanol
Summary
The first breakthrough in producing the photocatalytic effect of TiO2 was reported by FujishimaHonda in 1972, in which, photosplitting of water in the presence of TiO2 was achieved. The increased band gap in TiO2-SiO2 indicates that the electrons and holes possess stronger reduction (Kibombo et al, 2012) and oxidation abilities and these abilities enhance the photocatalytic activity of the TiO2-SiO2 photocatalyst in visible region.
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