研究目的
To fabricate TiO2-ZnO composite photocatalysts and analyze their enhanced photocatalytic properties for degrading rhodamine B under visible light irradiation.
研究成果
TiO2-ZnO composite photocatalysts exhibit enhanced photocatalytic activity for rhodamine B degradation under visible light, with a rate constant increase from 0.0059 min^-1 for P25 to 0.011 min^-1. This enhancement is due to reduced band gap energy, improved surface properties, separation of electron-hole pairs, and decreased recombination rate. The composites show good stability and potential applications in organic pollutant treatment and photocatalytic water splitting.
研究不足
The decreased photocatalytic stability over cycles is attributed to catalyst loss, indicating a need for improved recovery methods. The experimental details are in supplemental files, not fully described in the main text.
1：Experimental Design and Method Selection:
The TiO2-ZnO composite photocatalysts were prepared using a hydrothermal method, as detailed in supplemental files. The photocatalytic properties were analyzed by degrading rhodamine B water solutions under visible light irradiation.
2：Sample Selection and Data Sources:
Samples included pure ZnO, P25, TiO2 nanotube, and TiO2-ZnO composite photocatalysts. Rhodamine B water solution (25mL, 10^-5 mol/L) was used as the pollutant.
3：List of Experimental Equipment and Materials:
Equipment included Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), UV-Vis spectrophotometer, and X-ray diffraction (XRD) for characterization. Materials included TiO2, ZnO, and rhodamine B.
4：Experimental Procedures and Operational Workflow:
Hydrothermal synthesis was performed, followed by characterization using XRD, SEM, TEM, and UV-Vis spectroscopy. Photocatalytic degradation tests were conducted under visible light irradiation for up to 180 minutes, with degradation rates and rate constants calculated.
5：Data Analysis Methods:
XRD patterns were indexed to JCPDS standards. UV-Vis spectra were used to compute optical energy gaps via Tauc plots. Photocatalytic degradation rates were calculated, and rate constants were determined using the Langmuir-Hinshelwood kinetic model (ln(C0/C)=kt). Stability tests involved multiple cycles of degradation.
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