Abstract
Metal–organic frameworks are potential materials for the development of high performance catalysts. However, photocatalytic use of MOFs for water treatment has remained, by and large, unexplored. Therefore, in this study a novel Ag2CrO4–HKUST-1 photocatalyst was synthesized by a solvothermal route followed by chemical precipitation method. The as synthesized pure and composite photocatalysts were characterized by XRD, FTIR, SEM, TEM, N2-adsorption–desorption isotherms, UV–vis DRS, and Photoluminescence techniques. The Ag2CrO4/HKUST-1 composites were implied for photocatalytic degradation of two azo dyes, Congo Red (CR) and Ponceau BS (PBS) under Uv–vis light irradiation. The Ag2CrO4–HKUST-1 composites not only showed superior photocatalytic ability for CR and PBS degradation but also exhibited good catalyst stability. The photocatalytic performance of Ag2CrO4/HKUST-1 samples with different Ag: Cu molar ratio was investigated to find the optimum Ag2CrO4 content in the Ag2CrO4/HKUST-1 composite. The mechanism for the photocatalytic degradation of CR and PBS over Ag2CrO4/HKUST-1 composites was studied in detail by introducing different scavengers of active species involved in the Photocatalytic oxidation process. It was proposed that Ag2CrO4/HKUST-1 transforms into Ag2CrO4/Ag/HKUST-1 in the early stages of photocatalytic reaction due to the reduction of Ag2CrO4 by photogenerated electrons. The formation of ‘Ag’ nanoparticles on the surface of composite catalyst enhances the photocatalytic degradation of dyes significantly because these ‘Ag’ nanoparticles act as electron traps and promote interfacial charge transfer through the internal charge transmission via Z-scheme pathway. Moreover, Ag2CrO4–HKUST-1 composites did not show any significant loss of activity for CR and PBS degradation during three recycle experiments indicating their high stability.
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Acknowledgements
Owais Mehraj thanks Science and Engineering Research Board, Department of Science and Technology, India for the award of SERB- N-PDF grant (PDF /2016/000684). Feroz Ahmad Sofi thanks MHRD, Delhi, India for providing financial assistance. The authors are also highly thankful to Department of Chemistry NIT, Srinagar and central research facility NIT Srinagar for providing the instrumentation facility. SAIF Cochin, Kerala is also acknowledged for providing instrumentation facility for sample analysis.
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Mehraj, O., Sofi, F.A., Moosvi, S.K. et al. Synthesis of novel silver chromate incorporated copper-metal-organic framework composites with exceptionally high photocatalytic activity and stability. J Mater Sci: Mater Electron 29, 3358–3369 (2018). https://doi.org/10.1007/s10854-017-8271-x
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DOI: https://doi.org/10.1007/s10854-017-8271-x