研究目的
To prepare Ag-modified SnO2@TiO2 core-shell composite photocatalysts via a hydrothermal method and evaluate their photocatalytic activity for Rhodamine B degradation under visible light irradiation.
研究成果
Ag-modified SnO2@TiO2 core-shell composites were successfully prepared and showed significantly higher photocatalytic activity than pure TiO2 under visible light, attributed to the synergistic effect of Ag modification and SnO2 addition. The optimal photocatalytic performance was achieved with a 0.15 M AgNO3 modification.
研究不足
The study does not discuss the scalability of the synthesis method or the cost-effectiveness of the materials used. The environmental impact of the synthesis process and the long-term stability of the photocatalysts under various conditions are also not addressed.
1：Experimental Design and Method Selection:
The study involved the synthesis of Ag-modified SnO2@TiO2 core-shell composites using a hydrothermal method, followed by characterization and photocatalytic activity evaluation.
2：Sample Selection and Data Sources:
SnCl4·5H2O and polyethylene glycol (PEG) were used for SnO2 preparation, and tetrabutyl titanate for TiO2 coating. AgNO3 solutions of varying concentrations were used for Ag modification.
3：List of Experimental Equipment and Materials:
Instruments included X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), thermogravimetry (TG), X-ray photoelectron spectrometry (XPS), and UV-vis diffuse reflectance spectroscopy (DRS).
4：Experimental Procedures and Operational Workflow:
The synthesis involved preparation of SnO2, coating with TiO2 via hydrothermal method, and Ag modification under mercury lamp irradiation. Characterization was performed using the mentioned techniques.
5：Data Analysis Methods:
Photocatalytic activity was evaluated by measuring the degradation rate of Rhodamine B under visible light irradiation using UV-vis spectroscopy.
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