Selective swelling of block copolymer ultrafiltration membranes for enhanced water permeability and fouling resistance
Selective swelling of block copolymer ultrafiltration membranes for enhanced water permeability and fouling resistance
复制标题
嵌段共聚物超滤膜的选择性溶胀以增强透水性和抗污染性
DOI：
10.1016/j.memsci.2018.04.021
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发表时间：
2018-07
影响因子：
9.5
通讯作者：
Wang Yong
中科院分区：
文献类型：
--
作者：
Zhong Dinglei;Wang Zhaogen;Lan Qianqian;Wang Yong
高透性是分离膜最重要的追求之一。在这项工作中，通过非溶剂诱导相分离（NIPS）和嵌段共聚物聚砜-嵌段聚乙二醇（PSF-b-PEG）的选择性溶胀协同偶联制备了高性能超滤膜。NIPS用于制备具有薄皮层和指状亚层的PSF-b-PEG膜。随后的选择性肿胀在皮肤层产生中孔，并丰富了表面的PEG块。与未溶胀的膜相比，溶胀处理后的膜同时具有更高的渗透性、亲水性和抗污性。例如，在65 °C的50%醋酸中膨胀1 h的膜的渗透率比原始膜增加了一倍，而排异反应仅略有减少。经膨胀处理的膜的抗污性能也有所提高，这与膜表面聚乙二醇的富集有关。我们证明，通过调整溶胀条件，如溶胀试剂、持续时间和温度，可以在相对较宽的范围内调节膜的性能。由于极其简单和高效，这种选择性膨胀策略有望应用于调整表面特性和改善许多其他膜的性能。
High permeability is one of the most important pursuits of separation membranes. In this work, high-performance ultrafiltration membranes are prepared by synergetically coupling nonsolvent-induced phase separation (NIPS) and selective swelling of a block copolymer, polysulfone-block-poly (ethylene glycol) (PSF-b-PEG). NIPS is used to prepare PSF-b-PEG membranes with a thin skin layer and a fingerlike sublayer. Subsequent selective swelling generates mesopores in the skin layer and enriches PEG blocks on the surface. Compared to the membranes without swelling, the swelling-treated membranes exhibit simultaneously upgraded permeability, hydrophilicity, and fouling resistance. For instance, the permeability of the membrane swollen in 50% acetic acid at 65 °C for 1 h is doubled compared to the pristine one while the rejection is only modestly reduced. Fouling resistance of the swelling-treated membranes is also improved, whichisascribed to the enrichment of PEG on the membrane surface. We demonstrate that the performances of the membranes can be tuned in a relatively wide range by tailoring the swelling conditions, such as swelling reagents, durations and temperatures. Because of the extreme simplicity and high efficiency, this selective swelling strategy is expected to be applicable in tuning the surface properties and improving performances of many other membranes.
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