膜
纳滤
渗透
聚酰胺
材料科学
界面聚合
化学工程
单体
高分子化学
聚砜
酰胺
聚合
薄膜复合膜
多孔性
聚酯纤维
聚合物
反渗透
有机化学
复合材料
渗透
化学
工程类
生物化学
作者
Hao Zhang,Fei Xie,Zhang Zhao,Noor Ul Afsar,Fangmeng Sheng,Liang Ge,Xingya Li,Xiwang Zhang,Tongwen Xu
标识
DOI:10.1021/acsami.1c21862
摘要
Tuning the crosslinking density of interfacial-polymerized nanofiltration (NF) membranes varying from loose to dense structures can make them meet the demand of various applications. The properties (e.g., pore size and porosity) of NF membranes can be tuned by choosing monomers with different structures and reactivities. Herein, tris(hydroxymethyl)aminomethane (THAM), a low-cost and green monomer, is first employed for the preparation of poly(ester amide) (PEA) thin-film composite membranes via interfacial polymerization. The moderate reactivity of THAM enables rational regulation of the crosslinking density of PEA membranes from loose to dense structures by varying the THAM concentration, which can hardly be achieved for traditional polyamide or polyester membranes. The developed PEA membranes with a wide tunability range of crosslinking densities broaden their potential utility in NF. PEA membranes with dense structures show exceptional desalination performance with a water permeance of 11.1 L m-2 h-1 bar-1 and a Na2SO4 rejection of 97.1%. However, loose PEA membranes exhibit good dye/salt separation performance with a dye removal rate over 95.0% and negligible NaCl rejection (<7.5%), as well as high water permeance (>45 L m-2 h-1 bar-1). This work implies that PEA membranes with tunable crosslinked structures provide new possibilities for the development of task-specific separation membranes.
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