研究目的
The study focuses on the synthesis, characterization, and discussion of RH-derived mesoporous SiO2@TiO2 photocatalysts to explore the utilization of RH as an efficient photocatalyst carrier for photocatalytic application, contributing to the large scale practical application of photocatalysts for environment protection and green energy generation.
研究成果
The study concludes that RH-derived mesoporous SiO2@TiO2 photocatalysts are efficient for organic contaminants degradation, with optimized calcination temperature at 700 °C yielding the most active photocatalyst. The photocatalysts exhibit stable and recyclable properties, making them promising for large-scale practical applications. The work highlights the significance of utilizing biomass for preparing efficient photocatalysts.
研究不足
The study acknowledges the limitations in the practical application of nanocrystallized photocatalysts due to issues like enlarged band gap, serious aggregation, and recycling difficulties. It also notes the shortcomings of various carriers used for immobilizing photocatalysts, such as ceramics, glasses, and polymers, which may not withstand high temperatures or have low specific surface areas.
1：Experimental Design and Method Selection:
The study utilized rice husk (RH) as a biotemplate to prepare mesoporous SiO2@TiO2 photocatalysts. The methodology involved the absorption of tetrabutyl titanate by RH, followed by calcination at various temperatures to form SiO2@TiO2 hybrid structures.
2：Sample Selection and Data Sources:
RH was obtained from Yancheng City, Jiangsu Province, China. The samples were characterized using XRD, UV–vis-NIR spectrometry, BET and BJH models for surface area and pore analysis, TG-DSC for thermal analysis, XPS for elemental analysis, FTIR for functional group analysis, and SEM/TEM for morphological analysis.
3：List of Experimental Equipment and Materials:
Equipment included an X-ray diffractometer (SmartLab-3KW, Rigaku), UV–vis-NIR spectrometer (UV-3010, Shimadzu), thermogravimetric analyzer (Q500, TA), PHI5000 Versaprobe system for XPS, fluorescence spectrophotometer (FL3-221, Jobin Yvon), Vector-22 spectrometer for FTIR, SEM (Hitachi S4800), and TEM (JEOL 2100). Materials included tetrabutyl titanate, ethanol, and RH.
4：0). Materials included tetrabutyl titanate, ethanol, and RH.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: RH was immersed in tetrabutyl titanate solution, followed by calcination at temperatures ranging from 500 °C to 900 °C. The resulting photocatalysts were characterized and tested for photocatalytic activity in RhB degradation under xenon lamp and visible light irradiation.
5：Data Analysis Methods:
Photocatalytic efficiency was estimated by recording the absorption spectrum of RhB. The kinetic constants and correlation coefficients were calculated to describe the RhB degradation kinetics.
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