纳滤
聚酰胺
膜
选择性
界面聚合
相对湿度
化学工程
单体
材料科学
水蒸气
化学
色谱法
聚合物
高分子化学
复合材料
有机化学
催化作用
物理
工程类
热力学
生物化学
作者
Weilin Zhang,Jianqiang Wang,Xiaolan Geng,Li Liu,Fu Liu
标识
DOI:10.1016/j.seppur.2021.120131
摘要
Interfacial polymerized polyamide composite nanofiltration membrane has been widely used in wastewater treatment. Despite its high selectivity towards water and solutes, differentiation of solutes with similar size is still a great challenge. Herein, we propose that polyamide nanofiltration membrane with uniform and tunable pores and sub-nm precision selectivity can be achieved through electrospraying strategy via controlling relative humidity (ratio of practical vapor pressure P1 and its saturated vapor pressure Ps). The enhanced relative humidity facilitated the dispersion of piperazine (PIP) monomers on substrate and the reaction with trimesoyl chloride (TMC). The membrane (M78) fabricated at high humidity (70%-80%) exhibited more uniform pore size and narrower size region (0.26 nm-0.49 nm) at a designed rejection difference (e.g., 50%) compared with the membrane (0.26 nm-1.0 nm) obtained at low humidity (30%-40%). Membrane selectivity (e.g., Na2SO4 and NaCl) was an order of magnitude high when humidity increased from 30%-40% to 70%-80%. The current study offered a facile and effective strategy for fabricating polyamide nanofiltration membrane with uniform pores and sub-nm selectivity.
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