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Functional group effect of Isoreticular metal-organic frameworks on heavy metal ion adsorption

Abstract

Evaluating the relationship between structure and function of metal-organic frameworks (MOFs) is an interesting issue that has been discussed in this work. Here, four isoreticular 3D porous zinc(II) MOFs with pcu topology, including [Zn(oba)(4-bpmb)0.5]•(DMF)1.5 (TMU-6), [Zn(oba)(bpmn)0.5]•(DMF)1.5 (TMU-21), [Zn2(oba)2(bpfb)]•(DMF)5 (TMU-23) and [Zn2(oba)2(bpfn)]•(DMF)2 (TMU-24), H2oba = 4,4′-oxybisbenzoic acid, bpmb = N,N′-bis-(4-pyridylmethylene)-1,4-benzenediamine, bpmn = N,N′-bis-(4-pyridylmethylene)-1,5-naphthalenediamine, bpfb = N,N′-bis-(4-pyridylformamide)-1,4-benzenediamine and bpfn = N,N′-bis(4-pyridylformamide)-1,5-naphthalenediamine, containing imine- (TMU-6 and TMU-21) and amide- (TMU-23 and TMU-24) decorated pores, have been successfully synthesized by mechanochemical method as a convenient, rapid, low-cost, solventless, and green process. Then, adsorption efficiency of these four MOFs for some heavy metal ions was studied to evaluate the effect of type of the functional groups of the pillars in different MOFs on adsorption process. The results indicated that the amide-decorated MOFs show a better adsorption efficiency toward metal ions than the imine-decorated MOFs. In the following, TMU-23 was used as an efficient sorbent for extraction and removal of some heavy metal ions (Co+2, Cd+2, Cu+2, Cr+3, Fe+2, and Pb+2) and its analytical performance was evaluated and determined. In addition, DFT calculations were performed on possible coordination modes between cations and simplified functional groups of the related pillars in each MOF and probable interaction mechanism of the MOFs and the metal ions was evaluated.

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Publication details

The article was received on 10 Mar 2018, accepted on 04 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01150H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Functional group effect of Isoreticular metal-organic frameworks on heavy metal ion adsorption

    L. Esrafili, V. Safarifard, E. Tahmasebi, M. D. Esrafili and A. Morsali, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01150H

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