Co-Deposition of Stimuli-Responsive Microgels with Foulants During Ultrafiltration as a Fouling Removal Strategy
Co-Deposition of Stimuli-Responsive Microgels with Foulants During Ultrafiltration as a Fouling Removal Strategy
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DOI：
10.1021/acsami.9b03217
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发表时间：
2019-05-22
影响因子：
9.5
通讯作者：
Culfaz-Emecen, P. Zeynep
中科院分区：
文献类型：
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作者：
Aksoy, Canan;Kaner, Papatya;Culfaz-Emecen, P. Zeynep
在本研究中，我们证明了在污染饼层中共沉积温度响应微凝胶，并在刺激引起的微凝胶尺寸变化的情况下清洗饼是一种有效的去除污垢的方法。以CaCl2溶液中的腐植酸为模型污染物，以聚n-异丙基丙烯酰胺（p(NIPAm)）和聚n-异丙基丙烯酰胺-巯基甜菜素甲基丙烯酸酯（p(NIPAm-co- sbma)）为温度响应微凝胶。在低临界溶液温度（LCST）下进行过滤，并将温度升高到LCST以上进行清洗。作为一个额外的清洁，温度上下摆动，然后再高于最低温度。在低温下，尽管P（NIPAm）的体积随着温度的变化而变化了20倍，但它对污垢沉积物的清洗效果却很差。另一方面，P（NIPAm-co-SBMA）微凝胶对亲水性聚醚砜(PES)/聚乙烯吡咯烷酮（PVP）和疏水性PES膜具有高的污染可逆性。在低溶液离子强度和高溶液离子强度条件下，微凝胶具有较好的污垢可逆性。虽然单独使用微凝胶在一定程度上增加了污垢的可逆性，但即使在没有温度刺激的情况下，只有在微凝胶存在的情况下施加温度开关才能获得100%的可逆性，这表明微凝胶的体积变化对清洁的影响。
In this study, we show that codeposition of temperature responsive microgels in the foulant cake layer and cleaning of the cake upon stimuli-induced size change of the microgels is an effective method of fouling removal. Humic acid in CaCl2 solution was used as a model foulant and poly(n-isopropylacrylamide) (p(NIPAm)) and poly(n-isopropylacrylamide-cosulfobetainemethacrylate) (p(NIPAm-co-SBMA)) were used as temperature responsive microgels. Filtrations were done below the lower critical solution temperature (LCST) and temperature was increased to above the LCST for cleaning. As an extra cleaning a temperature swing of above, below and then again above the LCST was applied. P(NIPAm) was found to be ineffective in cleaning the foulant deposit despite the 20-fold change in its volume with temperature change at LCST. P(NIPAm-co-SBMA) microgels, on the other hand, provided high fouling reversibility on hydrophilic poly(ether sulfone)(PES)/poly(vinylpyrrolidone) (PVP) and hydrophobic PES membranes. Better fouling reversibility with these microgels was observed at low and high solution ionic strength. While the use of microgels alone increased fouling reversibility to some extent, even in the absence of temperature stimulus, 100% reversibility could only be obtained when a temperature switch was applied in the presence of microgels, showing the effect of microgels' volume change in cleaning.