The g-C3N4/SnS2 composites were prepared by in situ hydrothermal method, and the effect of g-C3N4 content on the physical and chemical properties, and photocatalytic performance of g-C3N4/SnS2 composites was investigated. The introduction of g-C3N4 enhanced the visible-light absorption of SnS2, and reduced the recombination rate of electron-hole pairs. The photocatalytic performance of g-C3N4/SnS2 composites was also obviously influenced by g-C3N4 content, and it was found that 15% g-C3N4/SnS2 composite exhibited the highest photocatalytic activity and excellent regeneration, which was attributed to the most efficient charge separation, the largest specific surface area and the formation of dominant active species (h(+) and center dot O-2(-) radicals) during the photocatalytic process. (C) 2016 Published by Elsevier B.V.