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Issue 39, 2016
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Room-temperature synthesis of bimetallic Co–Zn based zeolitic imidazolate frameworks in water for enhanced CO2 and H2 uptakes

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Abstract

A simple methodology was explored to access highly robust bimetallic Co–Zn based zeolitic imidazolate frameworks at room temperature. By tuning the content of Co and Zn precursors, CoZn-ZIF-8 frameworks with varying Co : Zn (25–90% of Co2+ as confirmed by ICP-AES results) were synthesized. Electron micrographs and powder X-ray diffraction (PXRD) patterns confirmed the formation of bimetallic CoZn-ZIF-8 frameworks of 150–300 nm size, where Zn atoms were partially replaced by Co atoms. The as-synthesized CoZn-ZIF-8 frameworks displayed a tuned pore size, pore volume and surface area, with the highest surface area (enhanced by ∼40% compared to Zn-ZIF-8) and pore volume (enhanced by ∼33% compared to Zn-ZIF-8) for Co75Zn25-ZIF-8. The as-synthesized CoZn-ZIF-8 frameworks also displayed enhanced CO2 and H2 uptakes at 298 K and 77 K, respectively, at 1 bar. Noteworthy enhancement of ∼30% in the CO2 and ∼23% in the H2 uptake was displayed by Co75Zn25-ZIF-8 frameworks as compared to Zn-ZIF-8 under analogous conditions.

Graphical abstract: Room-temperature synthesis of bimetallic Co–Zn based zeolitic imidazolate frameworks in water for enhanced CO2 and H2 uptakes

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Publication details

The article was received on 25 May 2016, accepted on 17 Aug 2016 and first published on 17 Aug 2016


Article type: Communication
DOI: 10.1039/C6TA04342A
Citation: J. Mater. Chem. A, 2016,4, 14932-14938
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    Room-temperature synthesis of bimetallic Co–Zn based zeolitic imidazolate frameworks in water for enhanced CO2 and H2 uptakes

    G. Kaur, R. K. Rai, D. Tyagi, X. Yao, P. Li, X. Yang, Y. Zhao, Q. Xu and S. K. Singh, J. Mater. Chem. A, 2016, 4, 14932
    DOI: 10.1039/C6TA04342A

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