水热制备的CuS纳米结构的基于结构的光学性质和催化活性,Nanotechnology

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水热制备的CuS纳米结构的基于结构的光学性质和催化活性
Nanotechnology ( IF 2.9 ) Pub Date : 2019-01-15 , DOI: 10.1088/1361-6528/aaf758
Mebrahtu Melake Mezgebe ₁ , Anqi Ju , Gang Wei , Daniel K Macharia , Shanyi Guang , Hongyao Xu

Affiliation

在没有任何表面活性剂或模板的情况下，通过水热法制备了不同形貌的纳米级硫化铜（CuS）。通过粉末X射线衍射（XRD）、傅里叶变换红外光谱、X射线光电子能谱（XPS）、场发射扫描电子显微镜（FESEM）、高分辨透射电子显微镜（HRTEM）对CuS的形貌和结构进行表征、Brunauer-Emmett-Teller (BET) 和紫外-可见 (UV-vis) 吸收光谱。FESEM 结果表明，只需改变水热溶剂即可制备出四种形态的 CuS（花状纳米球、交联纳米盘、交联纳米片和纳米片）。根据 XPS、XRD 和 HRTEM 结果，合成的纳米级结构是高度结晶的纯六方铜钴矿 CuS。UV-vis 光谱结果显示在可见光区有强烈的吸收峰，证实所得 CuS 在太阳能电池领域具有潜在应用。还详细研究了所得 CuS 在黑暗中对模型污染物亚甲蓝 (MB) 的催化活性。小而扁平的微晶在 MB 上显示出快速的降解速率，这归因于其大比表面积上的众多活性位点。与本工作中的其他纳米结构 CuS 以及先前报道的纳米结构相比，合成的 CuS 纳米片用最短的时间（仅 15 分钟）完全降解 MB。样品的总有机碳去除批准了 MB 污染物的矿化。因此，CuS是降解有机污染物的优良催化剂，其催化活性不需要光能。

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Structure based optical properties and catalytic activities of hydrothermally prepared CuS nanostructures

The nano-sized copper sulfides (CuS) with different morphologies were prepared by hydrothermal method without any surfactant or template. The morphology and structure of CuS were characterized by powder x-ray diffraction (XRD), Fourier transform infrared spectroscopy, x-ray photoelectron spectra (XPS), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET) and ultraviolet-visible (UV-vis) absorption spectroscopy. FESEM results show that four morphologies of CuS (flower-like nanospheres, cross-linked nanodisks, cross-linked nanoplates and nanosheets) were prepared simply by changing the hydrothermal solvent. According to the XPS, XRD and HRTEM results the synthesized nano-sized structures are highly crystallized pure hexagonal covellite CuS. UV-vis spectra results show intense absorption peaks in the visible region, confirming that the resultant CuS has potential application in the field of solar cells. The catalytic activities of resultant CuS on model pollutant methylene blue (MB) in the dark were also investigated in detail. The small and flat crystallites show rapid degradation rate on MB, which is attributed to the numerous active sites on their large specific surface area. The as-synthesized CuS nanosheets took the shortest time (only 15 min) to degrade MB completely compared with the other nanostructural CuS in this work as well as previously reported ones. Total organic carbon removal of the samples approved mineralization of the MB pollutant. Thus, CuS is an excellent catalyst for degrading organic pollutants, which does not require light energy for its catalytic activities.

更新日期：2019-01-15

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