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Mg doped OMS-2 nanorod: A highly efficient catalyst for purification of volatile organic compounds with full solar spectrum irradiation

Abstract

The catalysts of Mg doped OMS-2 nanorods with different Mg doping amount were prepared by hydrothermal redox reation among Mn(NO3)2, Mg (NO3)2, and KMnO4. We find that a small amount of Mg doping considerably promotes the catalytic activity of OMS-2 for the catalytic oxidation of carcinogenic and recalcitrant benzene (typical VOCs). The optimum Mg doped OMS-2 sample demonstrates much higher catalytic activity than the pure OMS-2 catalyst and a commercial precious metal catalyst (0.5% Pt/Al2O3). Its turnover frequency (TOF) at 200 oC is 3.8 times higher than that of the pure OMS-2 nanorods. The considerable enhancement of the catalytic activity of OMS-2 upon the Mg doping is attributed to the significant emhancement of the lattice oxygen activity of OMS-2. Very importantly, the Mg doped OMS-2 sample demonstrates highly efficient photothermocatalytic activity and very good stability for benzene oxidation with the full solar spectrum (UV-vis-IR) irradiation from a Xe lamp. Its initail rate of CO2 production is as high as 575.8 µmol min-1 g-1, which is 3.8, 171 times higher than that of pure OMS-2 and TiO2(P25), respectively. The Mg doped OMS-2 sample also demonstrates efficient photothermocatalytic activity with the visible-infrared (IR) irradiation. Remarkably, enven with the λ > 690 nm Vis-IR irradiation, it still demonstrates efficient photothermocatalytic activity with the rCO2 of 103.9 µmol min-1 g-1. The highly efficient catalytic activity of the Mg doped OMS-2 catalyst with UV-Vis-IR irradiation arises from the efficient solar-light-driven (SLD) thermocatalysis, which is attributed to its very good thermocatalytic activity as well as the efficient photothermal conversion due to its strong absorption in the whole solar spectrum region. A novel photoactivation effect, which is completely different from the well-konwn photocatalysis on semiconduction photocatalysts such as TiO2, is discovered to promote the SLD thermocatalytic activity of the Mg doped OMS-2 nanorods.

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Publication details

The article was received on 22 Jun 2017, accepted on 10 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7EN00567A
Citation: Environ. Sci.: Nano, 2017, Accepted Manuscript
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    Mg doped OMS-2 nanorod: A highly efficient catalyst for purification of volatile organic compounds with full solar spectrum irradiation

    S. Fang, Y. Li, Y. Yang, J. Chen, H. Liu and X. Zhao, Environ. Sci.: Nano, 2017, Accepted Manuscript , DOI: 10.1039/C7EN00567A

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