Preparation and characterization of a pH-responsive membrane carrier for meso -tetraphenylsulfonato porphyrin
Preparation and characterization of a pH-responsive membrane carrier for meso -tetraphenylsulfonato porphyrin
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DOI：
10.1039/c6ra26414j
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发表时间：
2017-01
期刊：
影响因子：
3.9
通讯作者：
Mingxia Wang;Feng Yan;Lizhi Zhao;Yuzhong Zhang;Mirco Sorci
中科院分区：
文献类型：
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作者：
Mingxia Wang;Feng Yan;Lizhi Zhao;Yuzhong Zhang;Mirco Sorci
制备了ph响应型聚砜-接枝-聚（4-乙烯基吡啶）(PSF-g- p4vp)-混合PSF膜，用于“智能”去除饲料中的中四苯基磺酰基卟啉（TPPS）。测定了PSF-g- p4vp -共混PSF膜的ph响应特性。水力渗透结果表明，pH响应特性符合预期，具有可逆性和持久性，并且发生在pH值在3.0和8.0之间的切换中。当pH为8.0时，水通量从70 L m−2 h−1急剧增加到1113 L m−2 h−1，PSF-g-P4VP聚合物在共混膜中的含量从10%增加到30%。对TPPS在ph响应型混合膜上的静态吸附实验表明，ph对TPPS的吸附能力有显著的影响。ph敏感膜不仅起到了智能膜的作用，可以吸附TPPS的聚集体，还可以诱导TPPS在膜表面聚集。随着pH值的降低，TPPS的通量减小，而其滞留量增加。在pH值低于3.0时，通量值不超过30 L m−2 h−1，这为TPPS在膜表面的自组装过程提供了充足的时间。在pH低于2.5时，由于阳离子P4VP单元的诱导作用，在混合膜表面观察到TPPS的j型聚集体，而在水溶液中，只有pH为1.0时才能发现j型聚集体。
A pH-responsive polysulfone-graft-poly(4-vinylpyridine) (PSF-g-P4VP)-blended PSF membrane was prepared for “smart” rejection of meso-tetraphenylsulfonato porphyrin (TPPS) in the feed. The pH-responsive characteristics of the PSF-g-P4VP-blended PSF membranes were determined. The hydraulic permeation results demonstrated that the pH-responsive characteristics behaved as expected, as these were reversible and durable, and occurred with the pH value switching between 3.0 and 8.0. Water flux drastically increased from 70 to 1113 L m−2 h−1 at pH 8.0 as the content of PSF-g-P4VP polymer in the blended membrane increased from 10% to 30%. The static adsorption of TPPS on the pH-responsive blended membrane showed that the adsorption capacity dramatically depended on pH. The pH-sensitive membrane not only plays the role of a smart membrane for rejecting the aggregates of TPPS, but also induces TPPS to assemble on the membrane surface. The flux decreases, whereas the retention of TPPS increases with the decreasing pH. The value of flux was not more than 30 L m−2 h−1 at a pH below 3.0, which provides plenty of time for the self-assembly process of TPPS on the membrane surface. J-aggregates of TPPS were observed on the blended membrane surface below pH 2.5, owing to the inductive effect of cationic P4VP units, whereas J-type aggregates could be only found at pH 1.0 in an aqueous solution.