Effect of branch structure of thermoresponsive oligomers on draw solution performance in forward osmosis process
Effect of branch structure of thermoresponsive oligomers on draw solution performance in forward osmosis process
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DOI：
10.1016/j.colsurfa.2020.125659
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Asuka Inada;Kenichiro Yumiya;K. Kumagai;H. Matsuyama
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文献类型：
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作者：
Asuka Inada;Kenichiro Yumiya;K. Kumagai;H. Matsuyama
合成了一系列具有不同分支结构的低聚环氧丁烷n嵌段低聚环氧乙烷m嵌段低聚环氧丁烷n嵌段低聚物（EBs）、甘油低聚环氧乙烷m嵌段低聚环氧丁烷n嵌段低聚物（GEBs）和戊四醇低聚环氧乙烷m嵌段低聚环氧丁烷n嵌段低聚物（PEBs）。EBs、GEBs和PEBs分别具有线性、三分支和四分支结构。这些低聚物作为正渗透（FO）过程的驱动溶质（DS）进行测试，以揭示其分支结构对FO性能和FO膜DS泄漏的影响。EBs、GEBs和PEBs的水溶液表现出典型的低临界溶解温度型相分离。渗透压为28 bar时，EB、GEB和PEB的FO水通量为4.1-4.8 L m− 2 h −1（LMH），而渗透压为28 bar时，DS浓度对应的反向溶质通量（Js）为0.79-1.83 gMH。Js随着DS分子中支链数量的增加而降低，这提高了FO性能指数。这些结果表明了在DS分子中引入分支结构对设计有用的DS的重要性。
A series of three types of oligomers—oligo(butylene oxide)n-block-oligo(ethylene oxide)m-block-oligo(butylene oxide)noligomers (EBs), glycerol-oligo(ethylene oxide)m-block-(butylene oxide)noligomers (GEBs), and pentaerythritol-oligo(ethylene oxide)m-block-(butylene oxide)noligomers (PEBs)—having different branch structures were synthesized. EBs, GEBs, and PEBs had linear, three-branch, and four-branch structures, respectively. These oligomers were tested as draw solutes (DSs) for the forward osmosis (FO) process in order to reveal the effect of their branch structures on the FO performance and DS leakage from the FO membrane. The aqueous solutions of EBs, GEBs, and PEBs exhibited a typical lower critical solution temperature-type phase separation. The FO water fluxes in the case of EB, GEB, and PEB were 4.1–4.8 L m−2h−1(LMH) at an osmotic pressure of 28 bar, while the reverse solute fluxes (Js) were 0.79–1.83 gMH at DS concentrations corresponding to an osmotic pressure of 28 bar.Jsdecreased with an increase in the number of branches in the DS molecule, which improved the FO performance index. The results indicate the importance of introducing a branch structure into DS molecules to design useful DSs.