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首页> 外文期刊>RSC Advances >Ultrathin layered MoS2 nanosheets with rich active sites for enhanced visible light photocatalytic activity
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Ultrathin layered MoS2 nanosheets with rich active sites for enhanced visible light photocatalytic activity

机译：具有丰富活性位点的超薄层状MoS2纳米片，可增强可见光的光催化活性

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摘要

Edge-rich active sites of ultrathin layered molybdenum disulphide (MoS _(2) ) nanosheets were synthesized by a hydrothermal method. The effect of pH on the formation of MoS _(2) nanosheets and their photocatalytic response have been investigated. Structural and elemental analysis confirm the presence of S–Mo–S in the composition. Morphological analysis confirms the presence of ultrathin layered nanosheets with a sheet thickness of 10–28 nm at pH 1. The interplanar spacing of MoS _(2) layers is in good agreement with the X-ray diffraction and high-resolution transmission electron microscopy results. A comparative study of the photocatalytic performance for the degradation of methylene blue (MB) and rhodamine B (RhB) by ultrathin layered MoS _(2) under visible light irradiation was performed. The photocatalytic activity of the edge-rich ultrathin layered nanosheets showed a fast response time of 36 min with the degradation rate of 95.3% of MB and 41.1% of RhB. The photocatalytic degradation of MB was superior to that of RhB because of the excellent adsorption of MB than that of RhB. Photogenerated superoxide radicals were the key active species for the decomposition of organic compounds present in water, as evidenced by scavenger studies.
机译：通过水热法合成了超薄层二硫化钼（MoS _（2））纳米片的富边缘活性位。研究了pH对MoS_（2）纳米片的形成及其光催化反应的影响。结构和元素分析证实了组合物中S–Mo–S的存在。形态分析证实，在pH 1下，薄层纳米片的厚度为10–28nm。MoS_（2）层的晶面间距与X射线衍射和高分辨率透射电子显微镜结果吻合良好。对可见光照射下超薄层MoS_（2）降解亚甲基蓝（MB）和若丹明B（RhB）的光催化性能进行了比较研究。富边缘超薄层状纳米片的光催化活性显示了36分钟的快速响应时间，MB的降解率为95.3％，RhB的降解率为41.1％。 MB的光催化降解性能优于RhB，因为MB的吸附性能优于RhB。如清除剂研究所示，光生超氧化物自由基是分解水中存在的有机化合物的关键活性物质。

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