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Improving the capability of UiO-66 for Cr(VI) adsorption from aqueous solutions by introducing the isonicotinate N–Oxide as the functional group†

Abstract

Considering wide production Cr(VI) from various industrial processes and its damaging toxicity as a carcinogenic agent, it is imperative to investigate stable and efficient adsorbents with a rapid performance for Cr(VI). Zirconium-containing metal–organic frameworks (Zr-MOFs) have been used as environmental friendly adsorbents for reducing metallic contaminants in aqueous media recently. Nontoxic metal sources, remarkable stabilities and distinguished physicochemical features such as high tendency of Zr-clusters to oxo-anions, beneficial structural defects, modification of their properties by modulator synthesis, and so on can be enumerated as Zr-MOFs advantageous. In this work, we could improve the adsorption capacity of UiO-66 as the most stable Zr-MOF for Cr(VI) adsorption from aqueous solutions by gradually addition of an N-O functional group which ultimately led us to a new Zr-MOF structure (TMU-66) with maximum Cr(VI) adsorption capacity of 60.241 mg/g which is 4 times the absorption capacity of UiO-66 and very fast kinetic (< 3 min) that followed the pseudo-second-order kinetics. This study demonstrates that a conceptual design can be helpful in synthesizing safe and stable adsorbents with the appropriate capacity and kinetics of adsorption.

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Publication details

The article was received on 05 Aug 2018, accepted on 11 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8DT03196G
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Improving the capability of UiO-66 for Cr(VI) adsorption from aqueous solutions by introducing the isonicotinate N–Oxide as the functional group†

    N. Shokouhfar, L. Aboutorabi and A. Morsali, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03196G

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