Abstract
Ethyl mercaptans which commonly exist in natural gas need to be removed due to their toxic, odorous, and corrosive properties. Herein, a novel Fe2O3-modified HNbMoO6 nanosheet catalyst (Fe2O3@e-HNbMoO6) was prepared by an exfoliation-impregnation method for the ethyl mercaptans removal. In the heterojunction catalyst, e-HNbMoO6 can be excited by visible light to generate the photogenic charge and has certain adsorption property for ethyl mercaptan with hydrogen bonding (Nb-OH or Mo-OH as the hydrogen bonding donor); Fe2O3 plays the role of accelerating photogenerated electrons and holes, and enhancing the adsorption of ethyl mercaptan with another hydrogen bonding (Fe-OH as the hydrogen bonding donor and receptor). Results showed that the adsorption capacity of Fe2O3@e-HNbMoO6 is 69.9 μmol/g for ethyl mercaptan. In addition, the photocatalytic conversion efficiency of ethyl mercaptan to diethyl disulfide is nearly 100% and it is higher than that of the other Nb-Mo based photocatalysts, such as LiNbMoO6, Fe1/3NbMoO6, Ce1/3NbMoO6, TiO2-HNbMoO6, e-HNbMoO6, CeO2@e-HNbMoO6, and Ag2O@e-HNbMoO6. Under the experimental conditions, the photocatalytic conversion efficiency is greater than the adsorption efficiency over Fe2O3@e-HNbMoO6, and there is no ethyl mercaptan output in the process of adsorption and photocatalytic conversion. Fe2O3@e-HNbMoO6 heterojunction catalyst has practical value and reference significance for purifying methane gas and enhancing photocatalytic conversion of ethyl mercaptan.
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The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Anhui Provincial Natural Science Foundation [grant number 2008085QE194], Research Foundation of the Institute of Environment-friendly Materials and Occupational Health of Anhui University of Science and Technology (Wuhu) [grant numbers ALW2020YF01, ALW2020YF09], Foundation of Anhui University of Science and Technology [grant number 13210667] and Innovation Fund Project of Anhui University of Science and Technology Graduate [grant number 2021CX2095].
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Lifang Hu and Xin He. The first draft of the manuscript was written by Lifang Hu. Lifang Hu, Jie He, and Jichao Zhu commented on previous versions of the manuscript and approved the final manuscript.
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Hu, L., He, X., He, J. et al. Adsorption and photocatalytic conversion of ethyl mercaptan to diethyl disulfide on Fe2O3-loaded HNbMoO6 nanosheet. Environ Sci Pollut Res 29, 75417–75430 (2022). https://doi.org/10.1007/s11356-022-21146-5
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DOI: https://doi.org/10.1007/s11356-022-21146-5