Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 39, Pages 14932-14938Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta04342a
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Funding
- IIT Indore
- CSIR, New Delhi
- SERB (DST), New Delhi
- CSIR New Delhi
- UGC, New Delhi
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A simplemethodology 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 similar to 40% compared to Zn-ZIF-8) and pore volume (enhanced by similar to 33% compared to Zn-ZIF-8) for Co75Zn25-ZIF-8. The as-synthesized CoZn-ZIF-8 frameworks also displayed enhanced CO2 and H-2 uptakes at 298 K and 77 K, respectively, at 1 bar. Noteworthy enhancement of similar to 30% in the CO2 and similar to 23% in the H-2 uptake was displayed by Co75Zn25-ZIF-8 frameworks as compared to Zn-ZIF-8 under analogous conditions.
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