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Issue 20, 2017
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Organosulfur adsorbents by self-assembly of titania based ternary metal oxide nanofibers

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Abstract

By doping with secondary and tertiary species, the electron configuration of titanium oxide can be tuned for the selective adsorption of natural gas contaminants such as thiols. In this study, we attempted to co-incorporate copper group metals/oxides and lanthanum oxide within titania nanofibers via linear poly-condensations of multiple metal acetate complexes. In all cases, a sol–gel synthesis in heptane allowed the nanofibers to randomly pack, forming 3 dimensional network bundles. The resulting nanostructures were characterized using electron microscopy, mass spectrometry, X-ray diffraction, X-ray photoelectron spectroscopy, N2 physisorption and Raman spectroscopy. Multicomponent breakthrough studies with three thiols, H2S, CO2 and CH4 show that doping a TiO2 matrix with copper group metals/oxides and La2O3 increased the thermal stability of anatase crystallites and nanostructures. We note that Au and Ag2O accumulated on the surfaces of the doped materials, where the La2O3 doping contributed more to the materials thermal stability. The Cu and La doped material was found to be the best adsorbent for thiols with remarkably high selectivity, demonstrating potential applications in industrial gas treatment. In addition, xerogel adsorbents through the random packing of linear structures provide the advantage of a macro-porous bulk material, which is less susceptible to fouling.

Graphical abstract: Organosulfur adsorbents by self-assembly of titania based ternary metal oxide nanofibers

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Publication details

The article was received on 28 Feb 2017, accepted on 24 Apr 2017 and first published on 24 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01856H
Citation: J. Mater. Chem. A, 2017,5, 9561-9571
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    Organosulfur adsorbents by self-assembly of titania based ternary metal oxide nanofibers

    R. Sui, S. K. Carefoot, C. B. Lavery, C. E. Deering, K. L. Lesage, N. Chou, C. J. Rose and R. A. Marriott, J. Mater. Chem. A, 2017, 5, 9561
    DOI: 10.1039/C7TA01856H

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