Highly efficient fluoride removal from water using 2D metal-organic frameworks MIL-53(Al) with rich Al and O adsorptive centers

Environmental Science and Ecotechnology

Zhihui Yang¹  Baocheng Song¹  Sikpaam Issaka Alhassan²  Haiying Wang³  Yixian Zhao⁴  Lei Huang⁵  Zhixuan Luo⁵  Linfeng Jin⁵ 

[1] Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, PR China;School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China;Fujian Environmental Protection Design Institute Co. Ltd, Fuzhou, 350000, PR China;School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China;School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China;

关键词: Two dimensions;    Metal-organic frameworks;    MIL-53(Al);    Fluoride;    Adsorption;   

DOI  :  

来源: DOAJ

【 摘 要 】

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-first-order 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 HF2− > 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.

【 授权许可】

Unknown