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Photocatalytic ozonation mechanism of gaseous n-hexane on MOx–TiO2–foam nickel composite (M = Cu, Mn, Ag): unveiling the role of ˙OH and ˙O2

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Abstract

Nanocomposites of MOx–TiO2 (M = Cu, Mn, Ag) supported on foam nickel (MOx/TiFN) were successfully applied in the photocatalytic ozonation of gaseous alkane. All MOx samples presented nanoflake structures with two metal oxides, corresponding to Cu2O and CuO in CuOx, Mn2O3 and MnO2 in MnOx, and Ag and Ag2O in AgOx. These binary metal oxides composited with TiFN displayed 1.3 to 2.0 times higher degradation and mineralization efficiencies toward 350 ppmv of n-hexane than TiFN. The promoted ˙OH and ˙O2 from O3 conversion on MOx were responsible for the enhanced efficiency. And ˙O2 made a higher contribution to the enhancement, since the relative amount of ˙O2 increased by 3.2 to 7.9 times more than ˙OH after MOx composition. Our experimental and theoretical mechanism results further confirmed that both ˙OH and ˙O2 were important for the epoxidation transformation of n-hexane on MOx/TiFN, while ˙OH dominated in the conversion of alcohol intermediates to corresponding radicals, and ˙O2 determined the subsequent epoxidation transformations of these radicals to four epoxides with 3, 5 and 6 membered rings. The present work could provide deep insight into an enhanced mechanism for nanomaterial photocatalytic ozonation technology, and efficiently replenish alkane atmospheric transformation mechanisms.

Graphical abstract: Photocatalytic ozonation mechanism of gaseous n-hexane on MOx–TiO2–foam nickel composite (M = Cu, Mn, Ag): unveiling the role of ˙OH and ˙O2−

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Publication details

The article was received on 16 Nov 2018, accepted on 29 Jan 2019 and first published on 30 Jan 2019


Article type: Paper
DOI: 10.1039/C8EN01291A
Citation: Environ. Sci.: Nano, 2019, Advance Article

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    Photocatalytic ozonation mechanism of gaseous n-hexane on MOx–TiO2–foam nickel composite (M = Cu, Mn, Ag): unveiling the role of ˙OH and ˙O2

    P. Wei, D. Qin, J. Chen, Y. Li, M. Wen, Y. Ji, G. Li and T. An, Environ. Sci.: Nano, 2019, Advance Article , DOI: 10.1039/C8EN01291A

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