Photocatalytic　hydrogenation　of　4-nitroaniline　over　the　In　2S3　photocatalyst　was　investigated　in　water　under　visible　light　irradiation　(λ　≥　420　nm).　After　90　min　of　visible　light　irradiation,　100%　of　4-nitroaniline　could　be　reduced　to　p-phenylenediamine　over　the　In2S3　photocatalyst　in　the　presence　of　triethanolamine　as　a　hole　scavenger.　Moreover,　the　photoreduction　activity　of　the　In　2S3　photocatalyst　could　keep　at　~　100%　in　the　5th　cycle　of　testing.　On　the　basic　of　the　results　of　electron　spin　resonance,　photoinduced　electrons　of　the　In2S3　photocatalyst　were　identified　as　the　active　species　for　the　photocatalytic　hydrogenation　of　4-nitroaniline.　©　2013　Elsevier　B.V.　All　rights　reserved.