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Detailed Program
Paper Number : NA-P07
Time Frame : 12:00~13:30
Presentation Date : Friday, 28, November
Session Name : Nano-particles & Nano-structured Materials
Session Chair 1# : -
Session Chair 2# : -
Tube-on-plate structured BiVO4/Bi2WO6 heterojunction with highly efficient photocatalytic activities
Dr. Wei Zhao
Yeungnam University
As a potential solution to the global energy problem and environmental pollution, the design and synthesis of artificial photocatalysts with high activities have attracted great scientific interest worldwide [1]. In the past few decades, the conventional TiO2 photocatalyst with high photoactivity and stability has been extensively investigated, but it is limited for practical applications due to its large band gap. Therefore, the development of visible-light-driven photocatalysts has attracted much attention. According to the knowledge of authors, there are two main strategies to develop new visible photocatalysts. The first one is the doping of TiO2 to extend its absorption to visible range. TiO2 doped with carbon, nitrogen, or sulfur has shown in some cases a photocatalytic activity in the visible range. However, the methods used for the doping element introduction are not fully controlled. And the low thermal stability of these compounds limits their applications. Moreover, these dopants act as recombination centers between photogenerated electrons and holes and consequently decrease the photocatalyst efficiency. In contrast, the second strategy is to use other materials which are absorbing in the visible range. Interestingly, bismuth-based compounds, such as bismuth vanadate (BiVO4) and bismuth tungstate (Bi2WO6), are important photocatalysts to replace cadmium-based material due to their low environmental toxicity. They have also inspired a great deal of research interest because of their high thermal stability, wide solar response, and excellent photocatalytic activity under visible-light irradiation [2-3]. It was reported that the composited semiconductor photocatalysts with the formation heterojunctions are photocatalytically more active than the individual components due to the significant recombination reduction of photogenerated charge carriers. In this study, considering the great photocatalytic activity of both BiVO4 and Bi2WO6, we tried to couple them into a composite. A one-pot hydrothermal method was adapted to obtain a novel tube-on-plate composite structure. The photocatalytic performance of the composite was evaluated by the degradation of rhodamine B (Rh.B) under solar light irradiation.
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