Utilizing transparent and conductive SnO2 as electron mediator to enhance the photocatalytic performance of Z-scheme Si-SnO2-TiOx |
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Authors: | Jing Gu Hongtao Yu Xie Quan Shuo Chen Junfeng Niu |
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Institution: | 1. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China2. Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China |
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Abstract: | ? A novel Z-scheme Si-SnO2-TiOx with SnO2 as electron mediator is first constructed. ? Transparent and conductive SnO2 can pass light through and promote charge transport. ? VO from SnO2 and TiOx improve photoelectrochemical performances. ? Efficient photocatalytic degradations originate from the Z scheme construction. Z-scheme photocatalysts, with strong redox ability, have a great potential for pollutants degradation. However, it is challenging to construct efficient Z-scheme photocatalysts because of their poor interfacial charge separation. Herein, by employing transparent and conductive SnO2 as electron mediator to pass light through and promote interfacial charge transportation, a novel Z-scheme photocatalyst Si-SnO2-TiOx (1<x<2) was constructed. The Z-scheme photocatalyst displayed an order of magnitude higher photocurrent density and a 4-fold increase in open-circuit potential compared to those of Si. Moreover, the onset potential shifted negatively for approximately 2.2 V. Benefiting from these advantages, this Z-scheme Si-SnO2-TiOx exhibited efficient photocatalytic performance toward phenol degradation and mineralization. 75% of the phenol was degraded without bias potential and 70% of the TOC was removed during phenol degradation. Other typical pollutants such as bisphenol A and atrazine could also be degraded without bias potential. Introducing a transparent and conductive electron mediator to construct Z-scheme photocatalyst gives a new sight to the improvement of photocatalytic performance in Z scheme. |
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Keywords: | Z-scheme photocatalyst Tin oxide Electron mediator Organic pollutant |
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