The Visible Light Photocatalytic Reduction of Cr(Vi) and Degradation of Rhb by Assembling a Novel In2s3/Zr-Biquinoline Framework Heterojunction Photocatalyst

Dichromate and dyes have been broadly employed in industrial and agricultural production, but they are also responsible for water environment deterioration. Photochemical purification of them based on MOFs based photocatalysts has been proved to be feasible. And construction of MOFs based heterojunctions to polish the band states is an efficient way to promote photogenerated electron-hole separation and carriers migration under visible light. Herein, a Zr(IV)-biquinoline framework with bcu topology was synthesized to act as matrix for depositing the in-situ generated In2S3 species, providing a novel In2S3/Zr-MOF heterojunction. Indeed, owing to the highly matched band structure of two components, new heterojunction exhibits optimized visible light utility, photogenerated electron-hole recombination inhibition ability and carriers migration kinetics. Ingeniously, the 10%-Zr-MOF exhibited excellent photocatalytic REDOX abilities against Cr(VI) ions and dye RhB, with the photocatalytic deoxidation efficiency towards Cr(VI) ions (96.7%) has been confirmed to be 3.14 and 1.42 times that of pristine Zr-MOF (30.8% for Cr2O72- ions) and sole In2S3 (68.2% for Cr2O72- ions), respectively. Moreover, it also displayed a photocatalytic reduction kinetic rate of 0.03096 min-1, which is 11.3 times and 2.69 times of fresh Zr-MOF (0.00274 min-1) and pure In2S3 (0.0115 min-1). And the photocatalytic reduction and degradation mechanisms of In2S3/Zr-MOF also have been deliberately proposed, according to the detailed experimental and instrumental characterization results. This contribution affords a feasible post-modification reinforcement strategy to assemble novel Zr-MOFs based photocatalytic platforms for decontamination of Cr(VI) and dyes from water.