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Trifunctional Metal-Organic Platform for Environmental Remediation: Structural Features with Peripheral Hydroxyl Groups Facilitate Adsorption, Degradation, and Reduction

Abstract

A Cd(II)-based metal-organic framework (MOF) {[Cd(PA)(4,4’-bpy)2](H2O)}n (where PA= pamoic acid, bpy= bipyridine) has been demonstrated to have trifunctional properties, namely (i) efficient and selective adsorbent for dyes, (ii) visible light active photocatalyst for the degradation of dyes and (iii) photocatalyst for Cr(VI) reduction. Hence, this material has a very good potential for environmental remediation application. In particular, the MOF exhibits excellent selectivity toward cationic methylene blue (MB) dye adsorption and its separation over neutral (neutral red) and anionic (methyl orange) dyes. In addition, the catalyst has also been explored for photocatalytic degradation of less adsorbed dyes, such as methyl orange (MO) and rhodamine B (RhB). Subsequently, the potential of the MOF for photocatalytic reduction of Cr(VI) under visible light irradiation has also been investigated and the catalyst was found to reduce 95% of Cr(VI) within 3 h. Moreover, simultaneous one pot photocatalytic reduction of Cr(VI) and dye degradation has been demonstrated with high efficiency using the same catalyst. The mechanism of adsorption could be correlated to the presence of peripheral hydroxyl groups in the MOF and the photocatalytic activity observed under visible light could be attributed to the optical properties of Cd-MOF. In principle, this work could broaden the utilization of single metal organic platform for multifunctional applications toward environmental remediation.

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Publication details

The article was received on 19 Oct 2018, accepted on 21 Nov 2018 and first published on 22 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT04180F
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Trifunctional Metal-Organic Platform for Environmental Remediation: Structural Features with Peripheral Hydroxyl Groups Facilitate Adsorption, Degradation, and Reduction

    H. Kaur, R. Kumar, A. Kumar, V. Krishnan and R. R. Koner, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT04180F

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