a.Key Laboratory of Materials Physics, Center for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Chinab.University of Science and Technology of China, Hefei 230026, China
Abstract:
To address the limitations of the separate fluoride removal or detection in the existing materials, herein, amino-decorated metal organic frameworks NH\begin{document}$ _2 $\end{document}-MIL-53(Al) have been succinctly fabricated by a sol-hydrothermal method for simultaneous removal and determination of fluoride. As a consequence, the proposed NH\begin{document}$ _2 $\end{document}-MIL-53(Al) features high uptake capacity (202.5 mg/g) as well as fast adsorption rate, being capable of treating 5 ppm of fluoride solution to below the permitted threshold in drinking water within 15 min. Specifically, the specific binding between fluoride and NH\begin{document}$ _2 $\end{document}-MIL-53(Al) results in the release of fluorescent ligand NH\begin{document}$ _2 $\end{document}-BDC, conducive to the determination of fluoride via a concentration-dependent fluorescence enhancement effect. As expected, the resulting NH\begin{document}$ _2 $\end{document}-MIL-53(Al) sensor exhibits selective and sensitive detection (with the detection limit of 0.31 \begin{document}$ \mu $\end{document}mol/L) toward fluoride accompanied with a wide response interval (0.5-100 \begin{document}$ \mu $\end{document}mol/L). More importantly, the developed sensor can be utilized for fluoride detection in practical water systems with satisfying recoveries from 89.6% to 116.1%, confirming its feasibility in monitoring the practical fluoride-contaminated waters.
