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Role of graphene in MnO2/graphene composite for catalytic ozonation of gaseous toluene

机译：石墨烯在MnO2 /石墨烯复合材料中气态甲苯催化臭氧氧化中的作用

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The degradation of gaseous toluene is of great significance to protect human health. In this work, a facile and environmentally friendly route for synthesis of different MnO2 loadings (14.2-94.8 wt.%) on graphene composites was developed through the direct redox reaction between graphene oxide and potassium permanganate at 160 °C for 12 h under hydrothermal condition. The elemental composition, crystal structure, and material properties of the MnO2/graphene samples were characterized using ICP-AES, XRD, TEM, FTIR spectroscopy, Raman spectroscopy, N2 physisorption technique, and TG/DTA. The results show that the hydrothermal method is an effective way to prepare tightly anchored birnessite-type MnO2 on graphene. MnO2 nanoparticles were uniformly distributed throughout the surface of graphene nano-sheets at 64.6 wt.% MnO2 loading, whereas aggregation or erosion of graphene sheets occurred at low or high loading of MnO2. The activities of graphene, MnO2, and the MnO2/graphene samples in catalytic ozonation of gaseous toluene were determined at 22 °C. The amount of MnO2 loaded on graphene showed a significant influence on the BET surface area, and the catalytic activity of the MnO2/graphene samples. The highest toluene degradation rate (7.89 x 10~(-6) mol min~(-1) g~(-1)) over the 64.6 wt.% MnO2/ graphene sample was attributed to the synergetic effect of graphene and MnO2 which was attributed to the tight connection between the active sites on graphene for adsorption of toluene and decomposition of ozone, and the MnO2 on graphene for decomposition of ozone to form atomic oxygen species.
机译：气态甲苯的降解对于保护人类健康具有重要意义。在这项工作中，通过在水热条件下氧化石墨烯与高锰酸钾在160°C下直接氧化还原反应12小时，开发了一种在石墨烯复合材料上合成不同MnO2负载量（14.2-94.8 wt。％）的简便且环保的方法。 。使用ICP-AES，XRD，TEM，FTIR光谱，拉曼光谱，N2物理吸附技术和TG / DTA对MnO2 /石墨烯样品的元素组成，晶体结构和材料性能进行了表征。结果表明，水热法是在石墨烯上制备紧密锚固的水钠锰矿型MnO2的有效方法。 MnO2纳米颗粒以64.6 wt。％的MnO2负载均匀分布在整个石墨烯纳米片的表面，而石墨烯片的聚集或侵蚀发生在低或高MnO2负载下。在22°C下测定了气态甲苯催化臭氧氧化中石墨烯，MnO2和MnO2 /石墨烯样品的活性。负载在石墨烯上的MnO2的量对BET表面积和MnO2 /石墨烯样品的催化活性有显着影响。在64.6 wt。％MnO2 /石墨烯样品上，最高的甲苯降解速率（7.89 x 10〜（-6）mol min〜（-1）g〜（-1））归因于石墨烯和MnO2的协同作用。这归因于石墨烯上用于吸附甲苯和分解臭氧的活性位点与石墨烯上用于分解臭氧以形成原子氧物种的MnO2之间的紧密连接。

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