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A bifunctional cationic metal-organic framework based on unprecedented nonanuclear copper(II) cluster for high dichromate and chromate trapping and highly efficient photocatalytic degradation of organic dyes under visible light irradiation

Abstract

A bifunctional cationic metal-organic framework {[Cu9(OH)6Cl2(itp)6(1,4-bdc)3](NO3)2(OH)2·20H2O}n (1-NO3-OH·20H2O) was synthesized and characterized (itp = 1-imidazol-1-yl-3-(1,2,4-triazol-4-yl)propane, 1,4-bdc = 1,4-benzenedicarboxylate). In 1-NO3-OH·20H2O, three [Cu3(3-OH)(2-OH)] trimeric clusters are bridged by two 3-Cl and form [Cu9(3-OH)3(2-OH)3(3-Cl)2] cluster. Such nonanuclear copper(II) cluster [Cu9(3-OH)3(2-OH)3(3-Cl)2] is not reported until now, as to our best knowledge. 1-NO3-OH·20H2O shows a 6-connected 2D 36-hxl net based on nonanuclear copper(II) cluster [Cu9(3-OH)3(2-OH)3(3-Cl)2]. 1-NO3-OH·20H2O is also the first 2D 36-hxl net based nonanuclear cluster. 1-NO3-OH (guest-free phase) shows fast and high efficient Cr2O72- and CrO42-trapping, and good recyclability for capturing of Cr2O72- and CrO42-. The adsorption capacities of 1-NO3-OH to capture Cr2O72- and CrO42- are 1.762 mol mol-1 (154.8 mg g-1) and 1.896 mol mol-1 (89.5 mg g-1), respectively at molar ratio 1:2 (1-NO3-OH to 2.5 × 10−3 mol/L Cr2O72- or CrO42-). 1-NO3-OH exhibits selective sorption of Cr2O72- or CrO42- from the solution containing mixture of Cr2O72- or CrO42- and tenfold the molar amount of ClO4-, NO3-, Cl-, BF4- or fivefold the molar amount of mol/L SO42-. 1-NO3-OH can capture 87.9% dilute Cr2O72- or 91.8% dilute CrO42- at equimolar 1-NO3-OH to 20 ppm Cr2O72- or CrO42-. 1-NO3-OH·20H2O exhibits highly efficient photocatalytic degradation of the cationic organic dyes methylene blue (MB) and rhodamine B (RhB) under visible light irradiation, and is a good photocatalyst for photocatalytic degradation of the cationic organic dyes.

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Publication details

The article was received on 27 Apr 2018, accepted on 10 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01685B
Citation: Dalton Trans., 2018, Accepted Manuscript
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    A bifunctional cationic metal-organic framework based on unprecedented nonanuclear copper(II) cluster for high dichromate and chromate trapping and highly efficient photocatalytic degradation of organic dyes under visible light irradiation

    T. Zheng, L. Qian, M. Li, Z. Wang, K. Li, Y. Zhang, B. Li and B. Wu, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01685B

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