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Article

Controlling the Structural Robustness of Zirconium-Based Metal Organic Frameworks for Efficient Adsorption on Tetracycline Antibiotics

by 1,2,†, 3,†, 2, 4, 1,* and 1,5,*
1
Water Cycle Research Center, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea
2
Department of Chemical and Biological Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, Korea
3
Department of Physics, Ulsan National Institute of Science and Technology, UNIST-gil 50, Ulju-gun, Ulsan 44919, Korea
4
Department of Earth and Environmental Sciences, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, Korea
5
Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally.
Academic Editor: Maurizio Barbieri
Water 2021, 13(13), 1869; https://doi.org/10.3390/w13131869
Received: 22 May 2021 / Revised: 25 June 2021 / Accepted: 2 July 2021 / Published: 5 July 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Tetracyclines (TCs) are the most widely used antibiotics for the prevention and treatment of livestock diseases, but they are toxic to humans and have frequently been detected in water bodies. In this study, the physical and chemical properties of the zirconium-based metal organic framework (MOF) UiO-66 and its NH2-functionalized congener UiO-66-NH2 were investigated along with batch TC adsorption tests to determine the effect of functionalization on TC removal. TC removal was highest at pH 3 and decreased with increasing pH. Pseudo-1st and pseudo-2nd-order kinetic models were used to study the adsorption equilibrium times, and Langmuir isotherm model was found to be more suitable than Freundlich model. The maximum uptake for UiO-66 and UIO-66-NH2 was measured to be 93.6 and 76.5 mg/g, respectively. Unexpectedly, the TC adsorption capacity of UiO-66-NH2 was observed to be lower than that of UiO-66. Density functional theory calculations revealed that the pore structures are irrelevant to TC adsorption, and that the –NH2 functional group could weaken the structural robustness of UiO-66-NH2, causing a reduction in TC adsorption capacity. Accordingly, robust MOFs with zirconium-based metal clusters can be effectively applied for the treatment of antibiotics such as TC in water. View Full-Text
Keywords: density functional theory calculations; structural robustness; tetracycline; zirconium-based metal organic frameworks; NH2 functional group density functional theory calculations; structural robustness; tetracycline; zirconium-based metal organic frameworks; NH2 functional group
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MDPI and ACS Style

Kim, H.-G.; Choi, K.; Lee, K.; Lee, S.; Jung, K.-W.; Choi, J.-W. Controlling the Structural Robustness of Zirconium-Based Metal Organic Frameworks for Efficient Adsorption on Tetracycline Antibiotics. Water 2021, 13, 1869. https://doi.org/10.3390/w13131869

AMA Style

Kim H-G, Choi K, Lee K, Lee S, Jung K-W, Choi J-W. Controlling the Structural Robustness of Zirconium-Based Metal Organic Frameworks for Efficient Adsorption on Tetracycline Antibiotics. Water. 2021; 13(13):1869. https://doi.org/10.3390/w13131869

Chicago/Turabian Style

Kim, Hee-Gon, Keunsu Choi, Kibong Lee, Soonjae Lee, Kyung-Won Jung, and Jae-Woo Choi. 2021. "Controlling the Structural Robustness of Zirconium-Based Metal Organic Frameworks for Efficient Adsorption on Tetracycline Antibiotics" Water 13, no. 13: 1869. https://doi.org/10.3390/w13131869

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