CdS/MoS2,an extremely efficient photocatalyst,has been extensively used in hydrogen photoproduction and pollutant degradation.CdS/MoS2 can be synthesized by a facile one-step hydrothermal process.However,the effect of the sulfur source on the synthesis of CdS/MoS2 via one-step hydrothermal methods has seldom been investigated.We report herein a series of one-step hydrothermal preparations of CdS/MoS2 using three different sulfur sources:thioacetamide,L-cysteine,and thiourea.The results revealed that the sulfur source strongly affected the crystallization,morphology,elemental composition and ultraviolet (UV)-visible-light-absorption ability of the CdS/MoS2.Among the investigated sulfur sources,thioacetamide provided the highest visible-light absorption ability for CdS/MoS2,with the smallest average particle size and largest surface area,resulting in the highest efficiency in Methylene Blue (MB) degradation.The photocatalytic activity of CdS/MoS2 synthesized from the three sulfur sources can be arranged in the following order:thioacetamide ＞ L-cysteine ＞ thiourea.The reaction rate constants (k) for thioacetamide,L-cysteine,and thiourea were estimated to be 0.0197,0.0140,and 0.0084 min-1,respectively.However,thioacetamide may be limited in practical application in terms of its price and toxicity,while L-cysteine is relatively economical,less toxic and exhibited good photocatalytic degradation performance toward MB.