UV–vis-infrared light-driven photothermocatalytic abatement of CO on Cu doped ramsdellite MnO2 nanosheets enhanced by a photoactivation effect
UV–vis-infrared light-driven photothermocatalytic abatement of CO on Cu doped ramsdellite MnO2 nanosheets enhanced by a photoactivation effect
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紫外可见红外光驱动的铜掺杂斜方锰矿 MnO2 纳米片上的 CO 光热催化减排通过光活化效应增强
DOI：
10.1016/j.apcatb.2017.11.017
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发表时间：
2018-05
期刊：
影响因子：
--
通讯作者：
Xiujian Zhao
中科院分区：
文献类型：
--
作者：
Yi Yang;Yuanzhi Li;Min Zeng;Mingyang Mao;Lan Lan;Huihui Liu;Jian Chen;Xiujian Zhao
采用Cu（NO3）2、Mn（NO3）2和KMnO 4在60 °C下的水热氧化还原反应制备了不同Cu/Mn摩尔比的Cu掺杂斜方晶系MnO 2纳米片。采用ICP-OES、XRD、TEM、SEM、N2吸附、XPS、UV-vis-IR吸收等手段对样品进行了表征。在全太阳光谱红外辐射下，Cu掺杂斜方晶系MnO 2纳米片对有毒空气污染物CO的催化净化具有高效的光热催化活性和很好的催化稳定性。在全太阳光谱照射下，最佳Cu掺杂的Ramsellite MnO 2纳米片样品的光热催化活性分别比纯的Ramsellite MnO 2纳米片样品和TiO 2（P25）样品提高了2.3倍和281.7倍。Cu掺杂的斜方晶系MnO 2纳米片样品即使在λ > 830 nm的红外辐射下也表现出高效的催化活性。Cu掺杂的ramsdellite MnO 2纳米片样品的高效催化活性来自于高效的太阳光驱动的热催化，因为其在整个太阳光谱范围内的强吸收和高热催化活性。Cu掺杂显著提高了斜方锰矿MnO 2的晶格氧活性，从而提高了其热催化活性。一种新的光活化，完全不同于众所周知的光催化半导体，如二氧化钛，被发现进一步提高太阳光驱动的热催化活性。我们结合联合收割机的CO-TPR和DFT计算的实验证据揭示了新的光活化的起源：辐照显著提高了Cu掺杂的斜方晶系MnO 2纳米片的晶格氧活性，从而加速了其太阳光驱动的热催化活性。
The Cu doped ramsdellite MnO2nanosheet samples with different Cu/Mn molar ratio were prepared by a facile hydrothermal redox reaction among Cu(NO3)2, Mn(NO3)2, and KMnO4at 60 °C. They were characterized by ICP-OES, XRD, TEM, SEM, N2adsorption, XPS, UV-vis-IR absorption, etc. The Cu doped ramsdellite MnO2nanosheet samples demonstrate highly efficient photothermocatalytic activity and very good catalytic stability for the catalytic purification of CO as one of poisonous air pollutants under the full solar spectrum infrared irradiation. Compared to the pure ramsdellite MnO2nanosheet sample and TiO2(P25), the photothermocatalytic activity of the optimum Cu doped ramsdellite MnO2nanosheet sample under the full solar spectrum irradiation is enhanced by 2.3, 281.7 times, respectively. The Cu doped ramsdellite MnO2nanosheet sample also demonstrates highly efficient catalytic activity even under the λ > 830 nm infrared irradiation. The highly efficient catalytic activity of the Cu doped ramsdellite MnO2nanosheet sample derives from efficient solar-light-driven thermocatalysis because of its strong absorption across the entire full solar spectrum and high thermocatalytic activity. The Cu doping considerably enhances the lattice oxygen activity of ramsdellite MnO2, thus promoting its thermocatalytic activity. A novel photoactivation, completely unlike the well-known photocatalysis on photocatalytic semiconductors such as TiO2, is discovered to further enhance the solar-light-driven thermocatalytic activity. We combine the experimental evidence of CO-TPR and DFT calculation to reveal the origin of the novel photoactivation: the irradiation considerably enhances the lattice oxygen activity of the Cu doped ramsdellite MnO2nanosheets, thus accelerating their solar-light-driven thermocatalytic activity.
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