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Molecules 2018, 23(8), 2086; https://doi.org/10.3390/molecules23082086

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

School of Chemistry Science and Engineering, Yunnan University, Cuihu North Road No. 2, Kunming 650091, China
These authors contributed equally to this work.
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Received: 12 June 2018 / Revised: 17 August 2018 / Accepted: 19 August 2018 / Published: 20 August 2018
(This article belongs to the Section Green Chemistry)
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Abstract

In this study, quaternary-ammonium-functionalized metal–organic frameworks (MOFs) Et-N-Cu(BDC-NH2)(DMF), were prepared, characterized, and applied for the highly effective removal of metal cyanide complexes, including Pd(CN)42−, Co(CN)63, and Fe(CN)63. Batch studies were carried out, and the maximum adsorption capacities of Pd(II), Co(III), and Fe(III) reached 172.9, 101.0, and 102.6, respectively. Adsorption was rapid, and equilibrium was established within 30 min. Et-N-Cu(BDC-NH2)(DMF) exhibited high thermal and chemical stability. Furthermore, absorbed Pd(CN)42− was selectively recovered by two-step elution. First, Co(CN)63 and Fe(CN)63 were eluted with a 1.5 mol L−1 KCl solution. Elution rates of Co(CN)63 and Fe(CN)63 were greater than 98.0%, whereas the elution percentage of Pd(CN)42− was less than 2.0%. Second, >97.0% Pd(CN)42− on the loaded MOFs was eluted using a 2.0 mol L−1 KI solution. The recovery rate of Pd(CN)42− was greater than 91.0% after five testing cycles. Adsorption isotherms, kinetics models, and adsorption thermodynamics of Pd(CN)42− on Et-N-Cu(BDC-NH2) (DMF) were also systematically investigated. The Et-N-Cu(BDC-NH2) (DMF) absorbent exhibited a rapid, excellent ability for the adsorption of metal cyanide complexes. View Full-Text
Keywords: metal cyanide complexes; removal; palladium cyanide recovery; metal-organic framework metal cyanide complexes; removal; palladium cyanide recovery; metal-organic framework
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhang, Q.; Chen, M.; Zhong, L.; Ye, Q.; Jiang, S.; Huang, Z. Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs. Molecules 2018, 23, 2086.

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