Synthesis of NiS/MIL-125 hybrids with expanded light absorption, fast carrier transfer and enhanced carrier separation. (January 2021)

• Record Type: Journal Article
• Authors: Li, Qi; Huang, Fei; Li, Dengke; Yan, Aihua; Dong, Haiming; Ru, Liyun; Wu, Run; Yang, Lijun
• Is Part Of: Materials research bulletin. Volume 133(2021)
• Publication Date: 2021-01
• Subjects: NiS/MIL-125 hybrids -- Photocatalysis -- Light absorption -- Charge transfer -- Carrier separation; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.111058
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: NiS/MIL-125(Ti) hybrids were successfully synthesized via a two-step solvothermal method. Precisely, the absorption spectrum and photocatalytic performance were tuned to an optimal domain through a series of experiments. The results showed that NiS loading resulted in expanded light absorption, narrowed band gap and enhanced photocatalytic activity. This work may open up a new opportunity for improving the photocatalytic performances of MIL-125 catalysts. Highlights: NiS/MIL-125(Ti) hybrids were synthesized via a two-step solvothermal method. NiS loading resulted in expanded light absorption and enhanced photocatalytic activity of MIL-125 catalysts. The enhanced photocatalytic activity was mainly attributed to stronger adsorptivity, faster charge transfer, and more efficient electron/hole separation. Abstract: MIL-125-based metal − organic frameworks have rapidly emerged as versatile candidates for heterogeneous catalysts due to their high porosity, strong adsorption capacity and unique combination platform. Here NiS/MIL-125 hybrids were synthesized via a two-step solvothermal method. Precisely, the absorption spectrum and photocatalytic performance were tuned to an optimal domain through a series of experiments and advanced tools. The results showed that NiS loading resulted in expanded light absorption, narrowed band gap, and enhanced photocatalytic activity. The samples loaded 8 at.% NiS had the highest degradation efficiency of 98.5% towards rhodamine B dyes within 60 min, while it was only 83.1% for pure MIL-125 catalysts. Further analysis showed that low charge-transfer resistance, slow carrier recombination rate and efficient carrier separation efficiency contributed to the enhanced photocatalytic activity. This work may open up a new opportunity for improving the photocatalytic performances of MIL-125 catalysts.