研究目的
Investigating the photoactivity of Ag/TiO2 microsphere prepared by one-step hydrothermal method for the photodegradation of rhodamine B under visible light.
研究成果
The Ag/TiO2 microsphere photocatalyst was successfully prepared by one step hydrothermal method. The 6 % Ag doped TiO2 catalyst showed higher photoactivity, degrading 86.6 % of rhodamine B within 60 min under visible light irradiation. The catalyst was reused up to three runs with slight descent in activity.
研究不足
The catalyst's photoactivity descends after the third cycle, possibly due to photo-corrosion. The light intensity of solar can't be controlled and is lower than Xe lamp in the experiments.
1：Experimental Design and Method Selection:
The Ag/TiO2 microsphere photocatalyst was prepared via a one-step hydrothermal method. The photocatalytic activity was evaluated by degrading rhodamine B under visible light.
2：Sample Selection and Data Sources:
Silver nitrate, HNO3, titanium tetraisopropoxide (TTIP), CH3CH2OH, and rhodamine B were used as reagents. Ultrapure water was employed in all experimental work.
3：List of Experimental Equipment and Materials:
XRD (D8 Advance, Bruker AXS, Germany), SEM (Hitachi S-4800, Japan), TU-1901 UV-visible spectrophotometer (Beijing Purkinje General Instrument Co. Ltd., China).
4：Experimental Procedures and Operational Workflow:
The mixture of reagents was heated at 140 °C with constant stirring during 4 h in oil bath. After filtration, the product was treated with ultrapure water until pH value close to 7, dried, and calcined at 400 °C for 4 h.
5：Data Analysis Methods:
The degradation ratio of rhodamine B was calculated by A/A0 × 100 %. The catalysts were characterized by XRD and SEM.
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