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Synthesis and characterization of direct Z-scheme Bi2MoO6/ZnIn2S4 composite photocatalyst with enhanced photocatalytic oxidation of NO under visible light

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Abstract

In the work, the direct Z-scheme Bi2MoO6/ZnIn2S4 (BMO + x%–ZIS; x = 2, 4, 6, 8, 10) composite semiconductor photocatalysts were successfully constructed by using a simple wet impregnation method. Then the oxidation of NO (~400 ppm) with H2O2 solution injected (0.0075 mL min−1) was used to estimate their photocatalytic performances under visible light. The results indicate that BMO + x%–ZIS composites exhibit enhanced photocatalytic activity, wherein the BMO + 6%–ZIS composite possesses the highest photocatalytic activity (84.94%). The enhanced photocatalytic performance is ascribed to the low rate of recombination of photogenerated electrons and holes and the production and participation of active radical species as confirmed by PL spectra and trapping experiment as well as fluorescence spectra. The existence of H2O2 is also essential in the improvement of the photocatalytic efficiency via production of more active species. The photocatalytic product in the PCO of NO is NO3 −, which was detected by ion chromatography. In addition, the mechanism of PCO of NO was discussed detailedly. The results indicate that ·OH plays an important role, but the effect of ·O2 − is also crucial in the experiment of PCO of NO system.

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Acknowledgements

This work was financially supported by the Key Project of Chinese National Programs for Research and Development (2016YFC0203800). Assembly Foundation of the Industry and Information Ministry of the People’s Republic of China 2012 (543), the National Natural Science Foundation of China (51408309 and 51578288), Science and Technology Support Program of Jiangsu Province (BE2014713), Natural Science Foundation of Jiangsu Province (BK20140777), Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province (BY2014004-10), Science and technology project of Nanjing (201306012), Jiangsu Province Scientific and Technological Achievements into a Special Fund Project (BA2015062), Top-notch Academic Programs of Jiangsu Higher Education Institutions, A Project by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, People’s Republic of China

    Shipeng Wan, Qin Zhong, Man Ou & Shule Zhang

  2. Nanjing AIREP Environmental Protection Technology Co., Ltd., Nanjing, 210091, Jiangsu, People’s Republic of China

    Shipeng Wan, Qin Zhong, Man Ou & Shule Zhang

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  1. Shipeng Wan
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Correspondence to Qin Zhong.

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Wan, S., Zhong, Q., Ou, M. et al. Synthesis and characterization of direct Z-scheme Bi2MoO6/ZnIn2S4 composite photocatalyst with enhanced photocatalytic oxidation of NO under visible light. J Mater Sci 52, 11453–11466 (2017). https://doi.org/10.1007/s10853-017-1283-3

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