Construction of Cus/Mos2 Heterojunctions for Efficient Photocatalytic Degradation of Cr(Vi)

Abstract

CuS/MoS2 heterojunctions has been successfully fabricated by a facile one-step hydrothermal method. A series of characterization results proved the existence of heterointerface between CuS and MoS2. The as-obtained CuS/MoS2 heterojunctions exhibited remarkable photocatalytic performance toward the removal of Cr(VI) under visible light with k value of 1.33×10-2 min-1, obviously higher than pure CuS (2×10-4 min-1) and MoS2 (4×10-4 min-1). The enhanced photocatalytic performance was attributed to the fast photogenerated charge separation and transfer rate induced by the interfacial effect between CuS and MoS2, which were revealed by Photoluminescence spectra, Transient photocurrent responses and Electrochemical impedance tests. The cyclic activity tests showed the high photostability of the CuS/MoS2 heterojunctions. Meanwhile, the possible Cr(VI) photoreduction mechanism on CuS/MoS2 heterojunctions was reasonably proposed.

Keywords: CuS/MoS2, Heterojunctions, Photocatalysis, Cr(VI), charge transport