Superior Performance of Copper Based MOF and Aminated
Graphite Oxide Composites as CO<sub>2</sub> Adsorbents at Room Temperature
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Abstract
New composites Cu-BTC MOF and graphite
oxide modified with urea
(GO-U) are developed and tested as CO<sub>2</sub> adsorbents at room
temperature. The composite containing GO-U with the highest nitrogen
content exhibits an excellent CO<sub>2</sub> uptake (4.23 mmol/g)
at dynamic conditions. The incorporation of GO-U into MOF changes
the chemistry and microstructure of the parent MOF and results in
synergistic features beneficial for CO<sub>2</sub> retention on the
surface. To identify these features the initial and exhausted materials
were extensively characterized from the points of view of their porosity
and chemistry. Although the adsorption forces are relatively strong,
the results indicate that CO<sub>2</sub> is mainly physisorbed on
the composites at dry dynamic conditions at ambient temperature and
pressure. The primary adsorption sites include small micropores specific
for the composites, open Cu sites, and cage window sites