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Novel of TiO2/Ag3PO4/Bentonite Composite Photocatalyst: Preparation, Characterization and Application for Degradation of Methylene Blue in Aqueous Solution


Thi Thanh Thuy Tran, Van Dat Doan, Tran Thai Thuan Ho, Van Thuan Le and Hoai Thuong Nguyen*

Source title: 
Environmental Engineering Science, 36(1), 2019 (ISI)
Academic year of acceptance: 

The present work is devoted to the synthesis of a novel photocatalyst of TiO2/Ag3PO4/bentonite composite and its utilization for degradation of methylene blue (MB) in aqueous solution under visible light irradiation. The synthesized catalyst was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, Brunauer-Emmett-Teller method and energy-dispersive X-ray techniques. Degradation conditions were optimized as pH of 7, catalyst loading of 0.1 g, initial MB concentration of 50 mg/L at room temperature with composition weight ratio of TiO2:Ag3PO4:bentonite corresponding to 1:0.15:1, respectively. Results indicated that photocatalytic activity of this material was significantly improved due to the combination of advantages of its components. Kinetics of degradation process fitted well with a pseudo first-order model. A possible degradation mechanism was proposed and analyzed in detail. In addition, recycling study demonstrated a high stability of the catalyst over five continuous cycles of MB degradation.