Abstract
The OMS-2/SnO2 nanocomposite (OMS-2/SnO2) was synthesized with a facile redox reaction among SnSO4 and KMnO4 at 90 °C. OMS-2/SnO2 demonstrates very good photothermocatalytic activity as well as excellent photothermocatalytic stability for abatement of benzene (a typical refractory poisonous organic pollutant) under UV–Vis–IR illumination. It is found that the OMS-2/SnO2 nanocomposite formation causes a tremendous increase in the catalytic activity of SnO2. Compared to pure SnO2, the initial CO2 production rate of OMS-2/SnO2 for the photothermocatalytic benzene abatement is enhanced by 37.2 times. Under λ > 420, 480, and 690 nm Vis–IR illumination, OMS-2/SnO2 also shows good photothermocatalytic activity. The very good catalytic activity of OMS-2/SnO2 under the UV–Vis–IR illumination ascribes from the effective light-driven thermocatalytic benzene oxidation. It is discovered that the light-driven thermocatalytic activity is significantly promoted by a novel photoactivation on OMS-2 in OMS-2/SnO2: the lattice oxygen activity or reducibility of OMS-2 is promoted by Vis–IR illumination, thus its catalytic activity is significantly promoted. A novel synergetic effect among light-driven thermocatalysis on OMS-2 and UV photocatalysis on SnO2 is discovered to further promote the catalytic activity of OMS-2/SnO2.
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