Abstract
Semiconducting minerals of rutile (TiO2) and sphalerite (ZnS) are visible light (VL)-responsive photocatalysts in nature. The substitutions of metal ions for TiIV and ZnII make their electronic structure differ from their “pure” counterparts and result in the broad absorption of VL. The conduction band of sphalerite is negative enough to photoreduce many organics. While, the valence band potential of rutile is more positive than sphalerite, which enables it with stronger oxidation ability. Their good VL photocatalytic activities are therefore verified by the photooxidation of methyl orange (MO) by rutile’s valence band holes and photoreduction of carbon tetrachloride (CT) by sphalerite’s conduction band electrons, respectively. The abundant deposition and low cost make natural rutile and sphalerite, along with other semiconducting minerals, promising candidates for developing green photocatalytic technologies.
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Acknowledgments
This work was supported by the National Basic Research Program of China (973 Program, Program No. 2014CB846001) and the National Natural Science Foundation of China (Grant No. 41230103 & 41272003 & 41522201).
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Li, Y. et al. (2017). Visible Light Photocatalysis of Natural Semiconducting Minerals. In: An, T., Zhao, H., Wong, P. (eds) Advances in Photocatalytic Disinfection. Green Chemistry and Sustainable Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53496-0_2
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DOI: https://doi.org/10.1007/978-3-662-53496-0_2
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