g-C_3N_4/MoS_2纳米片异质复合物的球磨法制备及可见光催化性能（英文）

Fabrication of g-C_3N_4/MoS_2 Nanosheet Heterojunction by Facile Ball Milling Method and Its Visible Light Photocatalytic Performance

采用球磨法制备g-C_3N_4/Mo S_2纳米片异质复合物,运用X射线衍射仪、高分辨率透射电镜、紫外可见漫反射光谱和荧光发射光谱对异质复合物的结构和形貌进行了表征。以罗丹明B为模拟污染物,在可见光照射下考察了复合物的光催化特性。结果表明:Mo S_2纳米片可进入g-C_3N_4的层间形成异质复合物。含有2%MoS_2纳米片与g-C_3N_4形成的异质复合物在120 min内对罗丹明B的降解率为98%,其降解动力学常数是体相g-C_3N_4的4.3倍。g-C_3N_4/Mo S_2纳米片异质复合物具有十分优良的光催化特性,其催化活性的提高主要归因于光生电子和空穴的有效分离和传输。根据光捕获实验提出了复合物可能的光催化机理。

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 MoS_2nanosheets are successfully coupled into g-C3N4 to form a C3N4/MoS2 heterojunction.The kinetic constant of RhB degradation with g-C3N4/Mo S2 nanosheets-2 wt%heterojunction（0.0368 min-1is 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.