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Lin KA, Liu YT, Chen SY. Adsorption of fluoride to UiO-66-NH2 in water: Stability, kinetic, isotherm and thermodynamic studies. J Colloid Interface Sci. 2015;461:79-87doi: 10.1016/j.jcis.2015.08.061.
Lin, K. A., Liu, Y. T., & Chen, S. Y. (2016). Adsorption of fluoride to UiO-66-NH2 in water: Stability, kinetic, isotherm and thermodynamic studies. Journal of colloid and interface science, 46179-87. https://doi.org/10.1016/j.jcis.2015.08.061
Lin, Kun-Yi Andrew, et al. "Adsorption of fluoride to UiO-66-NH2 in water: Stability, kinetic, isotherm and thermodynamic studies." Journal of colloid and interface science vol. 461 (2016): 79-87. doi: https://doi.org/10.1016/j.jcis.2015.08.061
Lin KA, Liu YT, Chen SY. Adsorption of fluoride to UiO-66-NH2 in water: Stability, kinetic, isotherm and thermodynamic studies. J Colloid Interface Sci. 2016 Jan 01;461:79-87. doi: 10.1016/j.jcis.2015.08.061. Epub 2015 Aug 28. PMID: 26397913.
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J Colloid Interface Sci. 2016 Jan 01;461:79-87. doi: 10.1016/j.jcis.2015.08.061. Epub 2015 Aug 28.

Adsorption of fluoride to UiO-66-NH2 in water: Stability, kinetic, isotherm and thermodynamic studies.

Journal of colloid and interface science

Kun-Yi Andrew Lin, Yu-Ting Liu, Shen-Yi Chen

Affiliations

  1. Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan, ROC. Electronic address: [email protected].
  2. Department of Soil and Environmental Sciences, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan, ROC.
  3. Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan, ROC.

PMID: 26397913 DOI: 10.1016/j.jcis.2015.08.061

Abstract

To provide safe drinking water, fluoride in water must be removed and adsorption processes appear to be the most widely used method. Metal organic frameworks (MOFs) represent a new class of adsorbents that have been used in various adsorption applications. To study the adsorption mechanism of fluoride to MOFs in water and obtain related adsorption parameters, we synthesized a zirconium-based MOF with a primary amine group on its ligand, named UiO-66-NH2. The kinetics, adsorption isotherm and thermodynamics of fluoride adsorption to UiO-66-NH2 were investigated. The crystalline structure of UiO-66-NH2 remained intact and the local structure of zirconium in UiO-66-NH2 did not change significantly after being exposed to fluoride. The kinetics of the fluoride adsorption in UiO-66-NH2 could be well represented by the pseudo second order rate law. The enthalpy of the adsorption indicates that the F(-) adsorption to UiO-66-NH2 was classified as a physical adsorption. However, the comparison between the adsorption capacities of UiO-66-NH2 and UiO-66 suggests that the fluoride adsorption to UiO-66-NH2 might primarily involve a strong interaction between F(-) and the metal site. The fluoride adsorption capacity of UiO-66-NH2 was found to decrease when pH>7. While the presence of chloride/bromide ions did not noticeably change the adsorption capacity of UiO-66-NH2, the ionic surfactants slightly affected the adsorption capacity of UiO-66-NH2. These findings provide insights to further optimize the adsorption process for removal of fluoride using zirconium-based MOFs.

Copyright © 2015 Elsevier Inc. All rights reserved.

Keywords: Fluoride; Metal organic frameworks; UiO-66-NH(2); X-ray adsorption

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