Recently,
owing to their excellent structural and transport properties,
two-dimensional membranes have attracted tremendous interest for their
potential application in molecular separation. In this work, a new
type of functionalized Ti2CT
x
MXene membrane was proposed by introducing different kinds of polyelectrolytes
to regulate the membrane physicochemical structure for pervaporation
dehydration of isopropanol dehydration. The morphology, physical,
and chemical properties of powders and MXene-based membranes were
studied by SEM, AFM, FTIR, XPS, and contact angle test. Meanwhile,
the effect of polyelectrolyte functionalization on the MXene membrane
performance for isopropanol dehydration was also studied. The results
showed that the poly(diallyldimethylammonium chloride) (PDDA) functionalized
MXene membrane possesses the highest separation performance owing
to the optimized electrostatic effect and hydrophilicity. Besides,
other influencing factors including PDDA concentration, MXene loading,
and operating conditions on the MXene membrane performance were also
systematically investigated. The developed PDDA functionalized MXene
membrane showed excellent separation performance for dehydration of
90 wt % isopropanol/water at 50 °C with a total flux of 1237
g/m2·h and separation factor of 1932, showing great
potential in application of solvent dehydration.
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