Abstract
In this work, the removal of ethyl mercaptan (EM) from methane mixture by Ni–Ti layered hydroxide (Ni–Ti–LDH) was studied. Ni–Ti–LDH and its nanosheets (Ni–Ti–LDH–NS) were prepared through a co-precipitation and exfoliation–reassembled method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), attenuated total reflectance Fourier transform infrared (ATR, FT-IR) spectroscopy, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and N2 adsorption–desorption measurements. In addition, the specific surface area (156.9 m2/g) and total pore volume (0.63 cm3/g) of Ni–Ti–LDH–NS show better EM removal ability (49.41 mg/g at 298 K and 12,000 h−1), which is significantly higher than that of Ni–Ti–LDH (19.76 mg/g). Finally, the calculation results of density functional theory (DFT) show that nitrate had little effect on the overall adsorption performance in Ni–Ti–LDH. The adsorption of EM on Ni–Ti–LDH/NS is mainly through the hydrogen-bond interaction between S atom and H atom in hydroxyl group and the formation of coordination with exposed Ni and Ti atoms. This work broadens the application range of hydrotalcite materials as R-SH efficient adsorbent based on hydrogen bond and coordination bond interaction, and helps to enrich the application of hydrogen bond and coordination bond.
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Acknowledgements
The authors in this work thank the supports financially from the National Natural Science Foundation of China (No. 21271008), the Natural Science Foundation of Anhui Province (No. 2008085QE194), and the Research Foundation of the Institute of Environment-friendly Materials and Occupational Health of Anhui University of Science and Technology (Wuhu) (No. ALW2020YF01).
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Zhao, H., Hu, L., Zhang, X. et al. Adsorption and separation of ethyl mercaptan from methane gas on Ni–Ti–LDH nanosheets. Appl. Phys. A 128, 687 (2022). https://doi.org/10.1007/s00339-022-05807-3
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DOI: https://doi.org/10.1007/s00339-022-05807-3