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      Selective Dye Adsorption by Zeolitic Imidazolate Framework-8 Loaded UiO-66-NH 2

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          Abstract

          In this study, Zeolitic Imidazolate Framework-8 (ZIF-8)-loaded UiO-66-NH 2 was synthesized, characterized, and analyzed for its potential to efficiently remove dyes. The selective adsorption on ZIF-8-loaded UiO-66-NH 2 or its parent MOFs (UiO-66-NH 2 and ZIF-8) in the mixed dyes solution was explored, including anionic dye (methyl orange (MO)) and cationic dyes (methylene blue (MB) and rhodamine B (RhB)). ZIF-8-loaded UiO-66-NH 2 displayed much better selectivity to MB than its parent MOFs. Adsorption capacity of ZIF-8-loaded UiO-66-NH 2 (173 mg/g) toward MB was found to be 215% higher than UiO-66-NH 2 (55 mg/g). A kinetics study based on adsorption data demonstrated that the adsorption process most closely matched with the model of pseudo-second-order kinetic and Langmuir isotherm. The adsorption was an exothermic and spontaneous physical process as revealed by the values of thermodynamic parameters. Furthermore, reusability of ZIF-8-loaded UiO-66-NH 2 was investigated and revealed the significant regeneration efficiency in adsorption capacity for MB even after four adsorption cycles. Experimental results proved that the interaction between ZIF-8-loaded UiO-66-NH 2 and MB was mainly affected by the mechanism, for instance, electrostatic interaction as well as π–π stacking interactions.

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          Most cited references 51

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          Amine grafting on coordinatively unsaturated metal centers of MOFs: consequences for catalysis and metal encapsulation.

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            A facile synthesis of UiO-66, UiO-67 and their derivatives.

            A scalable, reproducible method of synthesizing UiO-66- and UiO-67-type MOFs, entailing the addition of HCl to the reaction mixture, has been investigated. The new protocol requires a fraction of the time of previously reported procedures, yields exceptional porosities, and works with a range of linkers.
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              Zr-based metal-organic frameworks: design, synthesis, structure, and applications.

              Among the large family of metal-organic frameworks (MOFs), Zr-based MOFs, which exhibit rich structure types, outstanding stability, intriguing properties and functions, are foreseen as one of the most promising MOF materials for practical applications. Although this specific type of MOF is still in its early stage of development, significant progress has been made in recent years. Herein, advances in Zr-MOFs since 2008 are summarized and reviewed from three aspects: design and synthesis, structure, and applications. Four synthesis strategies implemented in building and/or modifying Zr-MOFs as well as their scale-up preparation under green and industrially feasible conditions are illustrated first. Zr-MOFs with various structural types are then classified and discussed in terms of different Zr-based secondary building units and organic ligands. Finally, applications of Zr-MOFs in catalysis, molecule adsorption and separation, drug delivery, and fluorescence sensing, and as porous carriers are highlighted. Such a review based on a specific type of MOF is expected to provide guidance for the in-depth investigation of MOFs towards practical applications.
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                Author and article information

                Journal
                Nanomaterials (Basel)
                Nanomaterials (Basel)
                nanomaterials
                Nanomaterials
                MDPI
                2079-4991
                08 September 2019
                September 2019
                : 9
                : 9
                Affiliations
                [1 ]School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, China
                [2 ]Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China
                [3 ]Department of Physics, Henan Finance University, Zhengzhou 450046, China
                Author notes
                [* ]Correspondence: lijialiang@ 123456sdut.edu.cn (J.L.); liub@ 123456sdut.edu.cn (B.L.); Tel.: +86-1333-523-2177 (J.L.)
                Article
                nanomaterials-09-01283
                10.3390/nano9091283
                6781039
                31500352
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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