Mg-doped OMS-2 nanorods: a highly efficient catalyst for purification of volatile organic compounds with full solar spectrum irradiation,Environmental Science: Nano

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Mg-doped OMS-2 nanorods: a highly efficient catalyst for purification of volatile organic compounds with full solar spectrum irradiation
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-07-12 00:00:00 , DOI: 10.1039/c7en00567a
Shiming Fang _{1,

2,

3,

4} , Yuanzhi Li _{1,

2,

3,

4} , Yi Yang _{1,

2,

3,

4} , Jian Chen _{1,

2,

3,

4} , Huihui Liu _{1,

2,

3,

4} , Xiujian Zhao _{1,

2,

3,

4}

Affiliation

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 °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 μmol 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 λ > 690 nm vis-IR irradiation, it still demonstrates efficient photothermocatalytic activity with a r_CO₂ 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 across the whole solar spectrum. A novel photo-activation effect, which is completely different from the well-known photocatalysis on semiconducting photocatalysts such as TiO₂, is found to promote the SLD thermocatalytic activity of the Mg-doped OMS-2 nanorods.

中文翻译：

掺镁的OMS-2纳米棒：一种高效的催化剂，可通过全太阳光谱辐照纯化挥发性有机化合物

使用与Mn（NO ₃）₂，Mg（NO ₃）₂和KMnO ₄的水热氧化还原反应制备了具有不同Mg掺杂量的Mg掺杂OMS-2纳米棒催化剂。我们发现，少量的Mg掺杂会大大提高OMS-2的催化活性，以催化氧化致癌和难分解的苯（典型的VOC）。最佳的Mg掺杂OMS-2样品具有比纯OMS-2催化剂和市售贵金属催化剂（0.5％Pt / Al ₂ O ₃）。它在200°C时的周转频率（TOF）比纯OMS-2纳米棒的周转频率高3.8倍。掺杂镁后，OMS-2催化活性的显着提高归因于OMS-2的晶格氧活性的显着增强。非常重要的是，掺Mg的OMS-2样品具有高效率的光热催化活性，并具有从氙气灯发出的完整太阳光谱（UV-vis-IR）照射下苯氧化的非常好的稳定性。其最初的CO ₂产生速率高达575.8μmolmin ^-1 g ^-1，比纯OMS-2和TiO ₂高3.8倍和171倍（P25）。掺镁的OMS-2样品还显示了可见光（IR）辐射的有效光热催化活性。值得注意的是，即使在λ > 690 nm的vis-IR辐射下，它仍显示出有效的光热催化活性，r _{CO ₂}为103.9μmolmin ^-1 g ^-1。Mg掺杂的OMS-2催化剂具有UV-vis-IR辐射的高效催化活性源于有效的太阳光驱动（SLD）热催化，这归因于其非常好的热催化活性以及有效的光热转化由于其在整个太阳光谱中的强吸收性。发现了一种新颖的光活化作用，该作用与众所周知的对半导体光催化剂（如TiO _2）的光催化作用完全不同，可以提高掺Mg的OMS-2纳米棒的SLD热催化活性。

更新日期：2017-09-14

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