Journal
ENVIRONMENTAL SCIENCE-NANO
Volume 4, Issue 9, Pages 1798-1807Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7en00567a
Keywords
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Funding
- National Natural Science Foundation of China [21473127, 21673168]
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Mg-doped OMS-2 nanorod catalysts with different Mg doping amounts were prepared using a hydrothermal redox reaction with 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 has a 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 degrees C is 3.8 times higher than that of the pure OMS-2 nanorods. The considerable enhancement of the catalytic activity of OMS-2 upon Mg doping is attributed to the significant enhancement 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 full solar spectrum (UV-vis-IR) irradiation from a Xe lamp. Its initial rate of CO2 production is as high as 575.8 mu mol min(-1) g(-1), which is 3.8 and 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 visible-infrared (IR) irradiation. Remarkably, even with lambda > 690 nm vis-IR irradiation, it still demonstrates efficient photothermocatalytic activity with a r(CO2) of 103.9 mu mol 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 photo-thermal conversion due to its strong absorption across the whole solar spectrum. A novel photo-activation effect, which is completely different from the well-known photocatalysis on semiconducting photo-catalysts such as TiO2, is found to promote the SLD thermocatalytic activity of the Mg-doped OMS-2 nanorods.
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