Effect of the molecular weights of thermoresponsive polyalkylene glycol draw solutes on forward osmosis performance
Effect of the molecular weights of thermoresponsive polyalkylene glycol draw solutes on forward osmosis performance
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DOI：
10.1016/j.seppur.2020.117462
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发表时间：
2020-12-01
影响因子：
8.6
通讯作者：
Matsuyama, Hideto
中科院分区：
文献类型：
--
作者：
Inada, Asuka;Kumagai, Kazuo;Matsuyama, Hideto
近年来，正渗透（FO）工艺已被用作替代水净化技术。为了实现FO工艺，最重要的因素之一是开发具有高渗透压和低溶质泄漏的汲取溶液（DS）。在本研究中，研究了Mw = 278 - 3911 g/mol的聚（丙二醇-聚乙二醇）单丁醚（PAGB），并将其作为FO的温敏驱动溶质进行比较。所有PAGB都表现出相分离，低临界溶解温度（LCST）在42至53 ℃之间。所测试的PAGB之间的渗透压曲线轮廓不同。随着PAGB分子量的增加，FO水通量Jw和反向DS通量Js均减小。通过计算Js/Jw来测量FO性能。随着PAGB分子量的增加，Js值比Jw值下降得更剧烈。Mw范围为1810 - 3911 g/mol的PAGB具有最低的Js/Jw比，并且适合作为FO的驱动溶质。这些实验结果得到了数值计算的证实。热响应DS如PAGB可简化FO系统中DS的再生。可提供上标/下标
In recent years, the forward osmosis (FO) process has been used as an alternative water purification technique. To achieve the FO process, one of the most important factors is the development of a draw solution (DS) that exhibits a high osmotic pressure and low solute leakage. In this study, poly(propylene glycol -ran-ethylene glycol) monobutyl ethers (PAGBs) with Mw = 278-3911 g/mol were studied and compared as thermoresponsive draw solutes for FO. All PAGBs exhibited phase separations with a lower critical solution temperature (LCST) between 42 and 53 degrees C. The osmotic pressure curve profiles differed among the tested PAGBs. Both the FO water flux Jw and reverse DS flux Js decreased with increasing molecular weights of PAGBs. The FO performance was measured by calculating Js/Jw. The value of Js decreased more drastically with increasing molecular weights of PAGBs than Jw. PAGBs with Mw range of 1810-3911 g/mol had the lowest Js/Jw ratio and were suitable as draw solutes for FO. These experimental results were confirmed by numerical calculations. Thermoresponsive DSs such as PAGBs may simplify the regeneration of DSs in FO systems. Superscript/Subscript Available