膜
聚砜
海水淡化
化学工程
纳滤
材料科学
电渗析
化学
薄膜复合膜
离子交换
渗透
反渗透
正渗透
超滤(肾)
盐(化学)
离子交换膜
磺酸
作者
Tao Wang,Feng Gao,Si Li,William A. Phillip,Ruilan Guo
标识
DOI:10.1016/j.memsci.2021.119806
摘要
Abstract A series of pentiptycene-containing disulfonated polysulfone copolymers (PENT-BP) were synthesized via condensation polymerization. Water and salt transport properties (solubility, diffusivity and permeability) were characterized for acid-form membranes (PENT-BP(H)) and compared with triptycene-based sulfonated polysulfones (TRP-BP(H)) and a non-iptycene-containing 4,4′-biphenol-based series (BPS(H)) of polysulfones to investigate the effect of pentiptycene on membrane performance. At comparable water content, the PENT-BP(H) exhibited increased water and salt permeability due to the additional free volume introduced by the pentiptycene units. Enhanced water/salt permeability selectivity of PENT-BP(H) series was also observed due to a significantly higher diffusivity selectivity. At comparable water permeance ( P w D ~ 8 × 10 − 6 c m 2 / s ), the salt rejection of PENT-BP (H) copolymers obtained from dead-end filtration reached 91–93% at 400 psi, higher than that of a corresponding BPS(H) series. This study suggests that incorporation of iptycene moieties into polymer backbone is an effective strategy to enhance desalination membrane performance.
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