Synergetic effect between photocatalysis on TiO2 and solar light-driven thermocatalysis on MnOx for benzene purification on MnOx/TiO2 nanocomposites
Synergetic effect between photocatalysis on TiO2 and solar light-driven thermocatalysis on MnOx for benzene purification on MnOx/TiO2 nanocomposites
复制标题
TiO2 光催化和 MnOx 太阳光驱动热催化之间的协同效应用于 MnOx/TiO2 纳米复合材料上的苯纯化
DOI：
10.1039/c5ta00126a
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发表时间：
2015
影响因子：
11.9
通讯作者：
Zhao Xiujian
中科院分区：
文献类型：
--
作者：
Ma Yan;Li Yuanzhi;Mao Mingyang;Hou Jingtao;Zeng Min;Zhao Xiujian
以Mn（NO3）2和KMnO 4为原料，KMnO 4/Mn（NO3）2摩尔比为2：1，在TiO 2（P25）存在下，通过水热氧化还原反应制备了MnOx/TiO 2纳米复合材料。 采用XRD、TEM、EDX、XPS和BET等手段对MnOx/TiO 2纳米复合材料进行了表征。负载在TiO 2纳米颗粒上的氧化锰是无定形的。MnOx/TiO 2纳米复合材料可以有效地将吸收的太阳能转化为热能，导致温度显著升高。MnOx/TiO 2纳米复合材料在全太阳光谱光和可见-红外光照射下，对致癌物和致癌物苯的气相氧化表现出优异的催化活性和耐久性。首次发现负载型锰氧化物的光催化活性与TiO 2上的SiO2的光催化活性之间存在协同效应，显著提高了MnOx/TiO 2纳米复合材料的催化活性。
MnOx/TiO2 nanocomposites are prepared by the hydrothermal redox reaction of Mn(NO3)2 and KMnO4 with KMnO4/Mn(NO3)2 molar ratio of 2 : 1 in the presence of TiO2(P25). The MnOx/TiO2 nanocomposites are characterized by XRD, TEM, EDX, XPS, and BET. Manganese oxide supported on TiO2 nanoparticles is amorphous. The MnOx/TiO2 nanocomposites can efficiently transform absorbed solar energy into thermal energy, resulting in a considerable increase of temperature. The MnOx/TiO2 nanocomposites exhibit excellent catalytic activity and durability for the gas-phase oxidation of carcinogenic and recalcitrant benzene under the irradiation of full solar spectrum light and visible-infrared light. For the first time, we find a synergetic effect between photocatalysis on TiO2 and solar light-driven thermocatalysis on supported manganese oxide, which significantly improves the catalytic activity of the MnOx/TiO2 nanocomposites.