Investigating the effect of alkyl chain length on assessment as LCST-type draw solutes in forward osmosis
발표자
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초록
내용
A series of thermo-responsive tetrabutylphosphonium 1-alkanesulfonates (abbreviated as [P4444][CnS], n = 6, 8, 10, and 12), where n is the number of carbon atoms in the alkyl group on the 1-alkanesulfonate anion, were prepared to investigate their potential ability toward the application of draw solute in forward osmosis (FO). The LCSTs of the 20 wt% [P4444][C6S], [P4444][C8S], [P4444][C10S], and [P4444][C12S] draw solutions were approximately 83, 54, 49, and 56 °C, respectively. When the orientation of the active layer was heading toward the draw solution (AL-DS mode), the water and reverse solute flux of [P4444][C10S] were about 1.58 LMH and 0.81 gMH, respectively, at 20 wt% aqueous solutions. Thus, this study is the first to examine the structural transformations of the bulkier alkyl group on the sulfonate anion moiety and its feasibility as the new draw solute for the FO system.