In this study,metal-organic framework MIL-53(Al)was synthesized and studied to understand the different mechanisms between normal MIL-53(Al)and 2D metal-organic framework MIL-53(Al)for removing fluoride.Comparatively,...In this study,metal-organic framework MIL-53(Al)was synthesized and studied to understand the different mechanisms between normal MIL-53(Al)and 2D metal-organic framework MIL-53(Al)for removing fluoride.Comparatively,the 2D MIL-53(Al)had two-dimensional linear morphology rather than block shape,indicating more expose adsorptive sites than normal MIL-53(Al).The batch adsorption experiments were applied to investigate the performance of 2D MIL-53(Al),including pH,adsorption kinetics,and thermodynamics.The 2D MIL-53(Al)(75.50 mg/g)showed better adsorption capacity than normal MIL-53(Al)(35.63 mg/g).The adsorption process of 2D MIL-53(Al)followed the pseudo-firstorder model and Langmuir model.The adsorption mechanism of this material was further studied by using experimental characterization and density functional theory calculations in detail.The main adsorptive sites were Al and O in the 2D MIL-53(Al),and the relationship between fluoride binding with Al and O was HF^(-)_(2)>HF>F^(-).The species of fluoride were HF2,HF,F at different pH and concentrations.Hence,this study provides a significant way on the application of two-dimensional materials for removing fluoride.展开更多
基金This research was financially supported by Key R&D Program of Hunan Province(2018SK2026)the National Key R&D Program of China(2018YFC1802204)+1 种基金National Natural Science Foundation of China(51634010)Talent Cultivation Program of Guangzhou University(RP2021014).
文摘In this study,metal-organic framework MIL-53(Al)was synthesized and studied to understand the different mechanisms between normal MIL-53(Al)and 2D metal-organic framework MIL-53(Al)for removing fluoride.Comparatively,the 2D MIL-53(Al)had two-dimensional linear morphology rather than block shape,indicating more expose adsorptive sites than normal MIL-53(Al).The batch adsorption experiments were applied to investigate the performance of 2D MIL-53(Al),including pH,adsorption kinetics,and thermodynamics.The 2D MIL-53(Al)(75.50 mg/g)showed better adsorption capacity than normal MIL-53(Al)(35.63 mg/g).The adsorption process of 2D MIL-53(Al)followed the pseudo-firstorder model and Langmuir model.The adsorption mechanism of this material was further studied by using experimental characterization and density functional theory calculations in detail.The main adsorptive sites were Al and O in the 2D MIL-53(Al),and the relationship between fluoride binding with Al and O was HF^(-)_(2)>HF>F^(-).The species of fluoride were HF2,HF,F at different pH and concentrations.Hence,this study provides a significant way on the application of two-dimensional materials for removing fluoride.
