Abstract
Titanium dioxide (TiO2) is proposed to be effective photocatalyst for wastewater treatment, air purification, and self-cleaning ability, because of its strong oxidation and superhydrophilicity. In order to conquer the limits of TiO2, a variety of methods have been used. This paper presents a critical review of novel research and achievements in the modification of TiO2nanoparticles with silver halide (AgX,X=Cl, Br, I), which aims at enhancing the visible light absorption and photosensitivity. Herein we study the synthesis, physical and chemical properties, and the mechanism of this composite photocatalyst.
Highlights
Water is one of the most essential substances for all life
The results showed that the degradation reaction was highly promoted in NaCl electrolyte, as well as in an acid solution [9]
Compared with the commercial P25 photocatalyst, Sangchaya et al [14] and their team found that TiO2-AgCl powders which were synthesized by a sol-gel method were more efficient under UV and visible light irradiation
Summary
Water is one of the most essential substances for all life. an increasing number of organic pollutants are being discharged into aqueous environment along with wastewater. There are some drawbacks which have greatly limited the application of TiO2: one is the inefficient utilization of solar energy, and the other is the rapid recombination rate of photogenerated electron-hole pairs [2]. In response to these deficiencies, several approaches for TiO2 modification have been developed: doping by metals (noble metals, transition metals, lanthanide metals, alkaline and alkaline earth metals, cadmium sulphide, etc.) and nonmetals (nitrogen, fluorine, sulfur, carbon, etc.) and modification with dye-sensitization and composite semiconductors. This research leads to the synthesis of the first visible light plasmonic photocatalyst Ag/AgCl. the combination of AgX and TiO2 can have this kind of property. The Ag/AgCl ought to have both advantages, which can be excited under visible light irradiation and can be stable when illuminated
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