Fabrication of g-C3N4/MoS2 Nanosheet Heterojunction by Facile Ball Milling Method and Its Visible Light Photocatalytic Performance

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-10-01 DOI:10.1016/S1875-5372(18)30226-1

Yan Xin , Gao Qiang , Hui Xiaoyan , Yan Congxiang , Ai Tao , Wang Zhenjun , Sun Guodong , Su Xinghua , Zhao Peng

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引用次数: 16

Abstract

The g-C₃N₄/MoS₂ nanosheet heterojunction was prepared via a facile ball milling method. The microstructure and morphology of the composite were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy. The photocatalytic activities were evaluated by the degradation of organic Rhodamine B (RhB) under visible light irradiation. The results indicate that MoS₂ nanosheets are successfully coupled into g-C₃N₄ to form a C₃N₄/MoS₂ heterojunction. The kinetic constant of RhB degradation with g-C₃N₄/MoS₂ nanosheets-2 wt% heterojunction (0.0368 min⁻¹) is about 4.3 times as high as that of the bulk g-C₃N₄ (0.00840 min⁻¹). The enhanced photocatalytic activities can be mainly ascribed to the efficient separation and transportation of photo-induced electron-hole pairs. The possible photocatalytic mechanism of composites was proposed according to the light trapping experiment.

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易球磨法制备g-C3N4/MoS2纳米片异质结及其可见光催化性能

采用简易球磨法制备了g-C3N4/MoS2纳米片异质结。采用x射线衍射(XRD)、高分辨率透射电子显微镜(HRTEM)、紫外-可见漫反射光谱(DRS)和光致发光(PL)光谱对复合材料的微观结构和形貌进行了表征。通过可见光下有机罗丹明B (Rhodamine B, RhB)的降解研究了其光催化活性。结果表明，MoS2纳米片成功地耦合到g-C3N4中，形成C3N4/MoS2异质结。g-C3N4/MoS2纳米片-2 wt%异质结降解RhB的动力学常数(0.0368 min−1)是本体g-C3N4降解RhB的动力学常数(0.00840 min−1)的4.3倍左右。光催化活性的增强主要归因于光诱导电子-空穴对的有效分离和输运。根据捕光实验，提出了复合材料可能的光催化机理。

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