Abstract
The excess fluoride in water is a fatal threat towards ecological security and human health. Herein, a novel strategy for efficient removal of fluoride is proposed based on defective cerium-based metal organic frameworks (CeMOFs), which are prepared through a simple and cost-efficient water-compensation strategy at room temperature. By virtue of the tailored ligand exchange between the OH–/H2O coordinated at Ce defect sites and dissociative fluoride ions, CeMOFs exhibit superior affinity towards fluoride ion over other anions under wide pH range, as well as ultrahigh halotolerancy (5 mol L-1 of nitrate). Intriguingly, rich defects on CeMOFs give rise to a maximum adsorption capacity of up to 202.8 mg g−1 for fluoride and excellent reusability is also substantiated. Satisfactory fluoride removal results are reached when treating an assortment of actual environmental water samples, demonstrating the practical applicability of CeMOFs especially for complex high-fluoride matrixes. This work offers a reliable approach to fabricating functional materials with fine-tuned structures and surface properties for environmental application.
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