期刊
CHINESE JOURNAL OF CHEMICAL PHYSICS
卷 34, 期 2, 页码 227-237出版社
CHINESE PHYSICAL SOC
DOI: 10.1063/1674-0068/cjcp2004054
关键词
NH2-MIL-53(Al); Fluoride; Removal; Detection
资金
- National Key R&D Program of China [2017YFA0207202]
- National Natural Science Foundation of China [51572263, 51772299, 41701259]
In this study, amino-decorated metal organic frameworks NH2-MIL-53(Al) were fabricated for simultaneous removal and determination of fluoride, with high uptake capacity, fast adsorption rate, selective and sensitive detection capabilities. The developed sensor showed feasibility in monitoring practical fluoride-contaminated waters with satisfying recoveries.
To address the limitations of the separate fluoride removal or detection in the existing materials, herein, amino-decorated metal organic frameworks NH2-MIL-53(Al) have been succinctly fabricated by a sol-hydrothermal method for simultaneous removal and determination of fluoride. As a consequence, the proposed NH2-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 NH2-MIL-53(Al) results in the release of fluorescent ligand NH2-BDC, conducive to the determination of fluoride via a concentration-dependent fluorescence enhancement effect. As expected, the resulting NH2-MIL-53(Al) sensor exhibits selective and sensitive detection (with the detection limit of 0.31 mu mol/L) toward fluoride accompanied with a wide response interval (0.5-100 mu 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.
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