BACKGROUND: In order to prepare an environmental-friendly photocatalyst, natural mineral sericite is used as the substrate of photocatalysts. In this study, the TiO2-sericite composite materials are synthesized by a facile sol-gel process, followed via a calcination treatment that can improve the crystallinity of the nano-sized TiO2. The prepared composites are characterized by XRD, Raman, FTIR, UV-vis, SEM, and BETanalysis. The effects of the molecular ratio of TiO2 to sericite and the calcination temperature are also examined. RESULTS: Sericite is not only served as a substrate for nano-sized TiO2 to fabricate the micro-sized composite materials but also affect the formation of different crystalliniteTiO2. The characteristic results show that the addition of sericite can stabilize the crystal phase of TiO2; therefore, the sericite can maintain the crystalline anatase of TiO2 even after the calcination at 700 °C and 900 °C. Accordingly, the adsorption test and the photocatalytic degradation of methylene blue are conducted to verify the photocatalytic performance of the TiO2-sericite composite materials. It indicates that the synergetic effect of TiO2-sericite composites can facilitate the photocatalytic degradation of TiO2 accompanied by the initial adsorption of methylene blue by sericite. Based on the presence of various radicals, including ·OH, ·O2−, and 1O2, the mechanism of photocatalytic degradation of methylene blue via TiO2-sericite composites are successfully proposed. CONCLUSION: The excellent activity reveals that TiO2-sericite composites are with potential employed as ecological-friendly photocatalysts in the degradation of pollutants.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Waste Management and Disposal
- Organic Chemistry
- Inorganic Chemistry