Cho Yeonsu, Kang Hyo
BK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University 37 Nakdong-Daero 550 Beon-Gil, Saha-Gu Busan 49315 Republic of Korea
RSC Adv. 2022 Oct 13;12(45):29405-29413. doi: 10.1039/d2ra05131a. eCollection 2022 Oct 11.
Thermo-responsive ionic compounds were synthesized to examine if they have a powerful ability to draw solutes for forward osmosis (FO). The investigated compounds were tetrabutylammonium benzenesulfonate, tetrabutylphosphonium benzenesulfonate, tetrabutylammonium 2-naphthalenesulfonate, and tetrabutylphosphonium 2-naphthalenesulfonate (abbreviated as [N][BS], [P][BS], [N][NS], and [P][NS]). The lower critical solution temperature (LCST) characteristics of the materials that formed the monocyclic aromatic compound [BS] were not confirmed; however, the LCSTs of others that formed the bicyclic aromatic compound [NS] were confirmed to be approximately 37 °C ([N][NS]) and 19 °C ([P][NS]) at 20 wt% in aqueous solutions; this is valued in reducing the energy required for recovery of the draw solute. In addition, it suggests that ammonium-based ionic compounds have a higher recovery temperature than phosphonium-based ionic compounds. When an active layer was oriented to a draw solution (AL-DS mode) and using 20 wt% aqueous [N][NS] draw solution at room temperature, water and reverse solute fluxes were about 3.07 LMH and 0.58 gMH, respectively. Thus, this is the first study to investigate structural transformations of the anion and central atom of the cation and to examine prospective draw solutes of the FO system in this series.
合成了热响应性离子化合物，以研究它们是否具有强大的吸引溶质用于正向渗透（FO）的能力。所研究的化合物为苯磺酸四丁铵、苯磺酸四丁鏻、2-萘磺酸四丁铵和2-萘磺酸四丁鏻（简称为[N][BS]、[P][BS]、[N][NS]和[P][NS]）。形成单环芳香族化合物[BS]的材料的低临界溶液温度（LCST）特性未得到证实；然而，形成双环芳香族化合物[NS]的其他材料在20 wt%的水溶液中的LCST被证实约为37 °C（[N][NS]）和19 °C（[P][NS]）；这对于降低回收汲取溶质所需的能量很有价值。此外，这表明铵基离子化合物的回收温度高于鏻基离子化合物。当活性层朝向汲取溶液（AL-DS模式）并在室温下使用20 wt%的[N][NS]水溶液作为汲取溶液时，水通量和反向溶质通量分别约为3.07 LMH和0.58 gMH。因此，这是首次研究该系列中阴离子和阳离子中心原子的结构转变并考察FO系统潜在汲取溶质的研究。
