Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China.
ACS Appl Mater Interfaces. 2014 Apr 23;6(8):5548-57. doi: 10.1021/am405990g. Epub 2014 Apr 11.
A facile method for fabricating antifouling and high-flux nanofiltration (NF) membranes was developed based on bioinspired polydopamine (PDA). Polyethersulfone (PES) ultrafiltration membrane as the support was first deposited a thin PDA layer and then chemically modified by a new kind of fluorinated polyamine via Michael addition reaction between fluorinated polyamine and quinone groups of PDA. PDA coating significantly reduced the pore sizes of the PES support membrane and endowed the NF membrane with high separation performance (flux about 46.1 L/(m(2) h) under 0.1 MPa, molecular weight cutoff of about 780 Da). The grafted fluorinated polyamine on the PDA layer could form low free energy microdomains to impede the accumulation/coalescence of foulants and lower the adhesion force between foulants and the membrane, rendering the membrane surface with prominent fouling-release property. When foulant solutions (including bovine serum albumin, oil and humic acid) were filtered, the resultant NF membrane exhibited excellent antifouling properties (the minimal value of total flux decline ratio was ∼8.9%, and the flux recovery ratio reached 98.6%). It is also found that the structural stability of the NF membrane could be significantly enhanced due to the covalent bond and other intermolecular interactions between the PDA layer and the PES support.
基于生物启发的聚多巴胺（PDA），开发了一种用于制备抗污染和高通量纳滤（NF）膜的简易方法。首先将聚醚砜（PES）超滤膜作为支撑体沉积一层薄的 PDA 层，然后通过含氟聚胺与 PDA 的醌基之间的迈克尔加成反应进行化学修饰，将其化学修饰。PDA 涂层显著降低了 PES 支撑膜的孔径，使 NF 膜具有高分离性能（在 0.1 MPa 下通量约为 46.1 L/（m(2) h），分子量截流值约为 780 Da）。接枝在 PDA 层上的含氟聚胺可以形成低自由能的微区，阻止污染物的积累/聚结，并降低污染物与膜之间的粘附力，使膜表面具有突出的抗污染性能。当过滤污染物溶液（包括牛血清白蛋白、油和腐殖酸）时，所得 NF 膜表现出优异的抗污染性能（总通量下降率的最小值约为 8.9%，通量恢复率达到 98.6%）。还发现，由于 PDA 层和 PES 支撑体之间的共价键和其他分子间相互作用，NF 膜的结构稳定性可以得到显著增强。
