Efficient carbon
dioxide separation is an emerging field of interest
in the era of energy scarcity and environmental calamity. The present
study focuses on the versatile aspects of carboxymethyl chitosan and
dendrimer in terms of CO2 separation. A comprehensive study
has been accomplished to inspect the physicochemical properties of
the prepared membrane. The mixed gas (CO2/N2) separation performances have been measured varying the temperature
(60–110 °C) and sweep/feedwater flow ratio (0.33–3).
The blend membrane containing 10 weight (wt.)% dendrimer presented
highest CO2 permeance of ∼100 GPU and CO2/N2 selectivity ∼149 on maintenance of sweep/feedwater
flow ratio 2.33 and 1.67, respectively, at an operating temperature
of 90 °C. The remarkable performance displayed by the membrane
has been explained with reference to the dendrimer molecular gate
mechanism and the salting out effect offered by carboxymethyl chitosan
matrix.
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