Abstract
Photocatalytic degradation of organic pollutants in wastewater driven by solar energy is considered one of the effective means for environmental remediation. MIL-125(Ti) is a three-dimensional porous ordered metal-organic framework with Ti nodes, which has the advantages of porous structure, adjustable pore size, high chemical and thermal stability. However, the application of MIL-125(Ti) for photocatalysis is limited due to its limited light absorption and low carrier separation efficiency. Here, a novel AgI/MIL-125(Ti) composite was prepared by an ion precipitation exchange method to enhance the overcome of the above deficiencies. Characterization analysis reveals that AgI was uniformly loaded on the surface of MIL-125(Ti), forming a dense AgI/MIL-125(Ti) heterojunction. The light response range of AgI/MIL-125(Ti) composites was significantly improved, which promoted the generation of free radicals. In addition, the photogenerated electrons in the conduction band of AgI were transferred to MIL-125(Ti) by ligand-to-metal charge transfer (LMCT) mechanism under visible light, which avoids the recombination of e-h+ and prolongs the service life of the photocatalyst. Furthermore, as the main active substances, ·OH and ·O2- were generated in large quantities on the AgI surface, the presence of Ti3+-Ti4+ valence electron transfer band in the composite, significantly improved the photocatalytic performance. Therefore, the photocatalytic performance of AgI/MIL-125(Ti) composite for gentian violet degradation reached 95.7% in 120 minutes which was higher than that of the single component under visible light.
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The authors declare that data supporting the findings of this study are available within the article.
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The authors acknowledge the financial supports from the National Natural Science Foundation of China (51608194), Hunan Provincial Natural Science Foundation of China (2019JJ50391), Natural Science Foundation of Hunan (2018TP1017), and the Opening Fund of Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education.
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Liu, X., Fei, J., Peng, X. et al. Novel AgI/MIL-125(Ti) heterojunction for efficient photocatalytic degradation of organic pollutants under visible light: Interfacial electron transfer pathway and degradation mechanism. Water Air Soil Pollut 234, 278 (2023). https://doi.org/10.1007/s11270-023-06255-2
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DOI: https://doi.org/10.1007/s11270-023-06255-2