Porous Cd3(C3N3S3)2/CdS composites with outstanding Cr(VI) photoreduction performance under visible light irradiation

As an efficient and sustainable technology, photocatalysis driven by visible light has made great contributions to the removal of heavy metals from environment. In this work, a series of Cd3(TMT)2/CdS heterojunction composite photocatalysts were prepared by self-formation of CdS nanoparticles using an octahedral coordination polymer Cd3(C3N3S3)2 (denoted as Cd3(TMT)2) as a precursor. The photocatalytic performance of Cd3(TMT)2/CdS heterojunction composites for Cr(VI) has been significantly improved under visible light irradiation owing to effective separation and migration of photoexcited charge carriers. Moreover, Cd3(TMT)2/CdS composites exhibited remarkable photocatalytic reduction performance of Cr(VI) solution with high concentration. This photocatalyst provides a novel route in the photoreduction of Cr(VI).