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In Situ Growth of Self-Assembled ZIF-8–Aminoclay Nanocomposites with Enhanced Surface Area and CO2 Uptake
journal contribution
posted on 2017-08-09, 14:34 authored by Anindita Chakraborty, Subhajit Laha, Kesavan Kamali, Chandrabhas Narayana, Muthusamy Eswaramoorthy, Tapas Kumar MajiSelf-assembly
of metal–organic framework (MOF) nanoparticles (NPs) with a
functional material can result in MOF nanocomposites having new and
advanced properties along with the fabrication of new nanoscopic structures.
However, such assembly of MOFs has not been realized to date. Here
we report self-assembled nanocomposites of the zeolitic imidazolate
framework (ZIF-8) and layered aminoclay (AC) for the first time, and
the ZIF-8@AC composites exhibit significantly enhanced adsorption
properties in comparison to those of pristine ZIF-8 nanoparticles.
Four different composites denoted as ZIF-8@AC-1, ZIF-8@AC-2, ZIF-8@AC-3, and ZIF-8@AC-4 were synthesized by varying the clay content, and their AC contents
were found to be 12.1, 18.3, 22.2, and 27.2 wt %, respectively. The
composites were thoroughly characterized by PXRD, FTIR, Raman, and
various microscopic techniques (FESEM, TEM, and STEM). The formation
of the composites is driven by the specific interaction between unsaturated
Zn(II) sites of ZIF-8 nanoparticles and NH2 groups of the
aminoclay, which was validated from ζ potential and Raman spectroscopic
measurements. The adsorption studies of the desolvated composites
were also carried out in detail. The best performance is achieved
with one of the composites, which exhibits a 42% increase in BET surface
area while CO2 uptake at 298 K is doubled in comparison
to the ZIF-8 nanoparticles.
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MOF nanocompositesreport self-assembled nanocompositesadsorption studieszeolitic imidazolate frameworkBET surface areananoscopic structuresadsorption propertiesEnhanced Surface AreaFTIRCO 2 uptakeTEMRaman spectroscopic measurementsSitu GrowthNPPXRDCO 2 Uptake Self-assemblyFESEMZIF -8 nanoparticlesAC contents298 Kdesolvated compositesclay contentNH 2 groups
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