Improved photocatalytic activity of MoS2 nanosheets decorated with SnO2 nanoparticles
Improved photocatalytic activity of MoS2 nanosheets decorated with SnO2 nanoparticles
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DOI：
10.1039/c5ra15159g
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
S. Vattikuti;C. Byon;C. Reddy;R. Ravikumar
中科院分区：
文献类型：
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作者：
S. Vattikuti;C. Byon;C. Reddy;R. Ravikumar
采用简单的两步法成功制备了以SnO2修饰的MoS2纳米片。采用溶剂热法制备了二硫化钼纳米片，然后采用湿化学法制备了SnO2介孔纳米颗粒。采用粉末x射线衍射（XRD）、场发射扫描电镜（FESEM）、能量分散光谱（EDX）、高分辨率透射电镜（HRTEM）、热重和差热分析（TG-DTA）、x射线光电子能谱（XPS）和电化学阻抗谱（EIS）对纳米复合材料进行了表征。通过FESEM和HRTEM证实，SnO2介孔纳米颗粒可以选择性地形成并附着在层状MoS2的外周表面。在紫外光照射下，用罗丹明B （Rhodamine B, RhB）考察了纳米复合材料在水溶液中的光催化活性。与原始的MoS2催化剂相比，SnO2纳米颗粒明显抑制了MoS2光催化剂的电子-空穴复合效应，提高了光催化活性。在50分钟内完成更高的污染物降解速率，是原始MoS2催化剂的三倍。
MoS2 nanosheets decorated with SnO2 mesoporous nanoparticles were successfully prepared by a facile two-step method. The MoS2 nanosheets were pre-synthesized using a solvothermal method and then decorated with the SnO2 mesoporous nanoparticles through a wet chemical method. The nanocomposite was characterized with powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersed spectrometry (EDX), high-resolution transmission electron microscopy (HRTEM), thermal gravimetric and differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). SnO2 mesoporous nanoparticles can be selectively formed and attached to the peripheral surface of the layered MoS2, which was confirmed by FESEM and HRTEM. The photocatalytic activity of the nanocomposite was examined with Rhodamine B (RhB) in aqueous solution under UV light irradiation. The SnO2 nanoparticles remarkably suppressed the electron–hole recombination effect on the MoS2 photocatalyst and improved the photocatalytic activity compared to a pristine MoS2 catalyst. A higher rate of pollutant degradation was accomplished within 50 min that was three times higher than that of the pristine MoS2 catalyst.