Hydrothermal preparation of hierarchical MoS2-reduced graphene oxide nanocomposites towards remarkable enhanced visible-light photocatalytic activity
Hydrothermal preparation of hierarchical MoS2-reduced graphene oxide nanocomposites towards remarkable enhanced visible-light photocatalytic activity
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水热制备分级MoS2还原氧化石墨烯纳米复合材料显着增强可见光催化活性
DOI：
10.1016/j.ceramint.2016.11.026
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发表时间：
2017-02
影响因子：
5.2
通讯作者：
王春栋
中科院分区：
文献类型：
--
作者：
王春栋
通过水热合成方法成功合成了多级MoS2还原氧化石墨烯（RGO）纳米复合材料，并利用扫描电子显微镜、X射线衍射、透射电子显微镜和紫外可见吸收光谱研究了复合材料的形貌、晶体结构以及降解亚甲基蓝（MB）的光催化活性。结果表明，MoS2-RGO纳米复合材料表现出优异的光催化性能，在可见光照射30分钟下最大降解率高达80%。为了了解优异光催化性能的起源，还进行了第一原理计算。这表明优异的光催化活性应是由于MoS2的导带最大值(CBM)与RGO的CBM之间存在潜在的电子转移所致。同时，可见光吸收的增强、电子空穴对复合的减少以及染料吸收表面积的增加也可能是其优异光催化性能的因素。
Hierarchical MoS2-reduced graphene oxide (RGO) nanocomposites were successfully synthesized via a hydrothermal synthesis approach, and their morphology, crystal structure of the composites as well as the photocatalytic activities in the degradation of methylene blue (MB) were investigated using scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and UV–vis absorption spectroscopy. The results demonstrated that the MoS2-RGO nanocomposites exhibited excellent photocatalytic performance with a maximum degradation rate up to 80% under visible light irradiation for 30 min. To understand the origin of the excellent photocatalytic properties, first-principles calculations were also carried out. It manifested that the excellent photocatalytic activity should be resulted from the existence of the potential electron transfer between conduction band maximum (CBM) of MoS2and CBM of RGO. Meanwhile, the enhanced visible light absorption, reduced electron–hole pair recombination, and enhanced surface area for absorption of dyes also could be the factors for the excellent photocatalytic performance.
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