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

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.