Dopamine triggered one step polymerization and codeposition of reactive surfactant on PES membrane surface for antifouling modification
Dopamine triggered one step polymerization and codeposition of reactive surfactant on PES membrane surface for antifouling modification
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多巴胺引发反应性表面活性剂在PES膜表面一步聚合共沉积进行防污改性
DOI：
10.1016/j.seppur.2020.117148
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发表时间：
2020-10-15
影响因子：
8.6
通讯作者：
Cui, Fuyi
中科院分区：
文献类型：
--
作者：
Wang, Jichao;Tian, Jiayu;Cui, Fuyi
疏水聚合物碱与亲水性添加剂的反应性低、相容性差，给防污超滤膜的制备带来了挑战。本研究通过多巴胺触发一步聚合共沉积的方法，将反应性和两亲性良好的烯丙氧基壬基苯氧基丙醇聚氧乙烯（SE-10N）醚硫酸铵（AHPS）接枝到PES膜表面。衰减全反射傅里叶变换红外光谱（ATR-FTIR）和x射线光电子能谱（XPS）证实，在多巴胺的帮助下，AHPS很容易锚定在膜表面。场发射扫描电镜（FESEM）和原子力显微镜（AFM）也证实了膜表面形成新的涂层。改性层显著增强了超滤膜的亲水性，接触角从77.2度降低到55.8度。结果表明，改性膜的抗污染性能显著提高。膜表面对牛白蛋白（BSA）的静态吸附由77.2 μ g/cm(2)降至34.3 μ g/cm(2)。此外，改性膜的通量回收率（95.9%）和污染可逆性（51.6%）分别高于未改性膜（56.7%和23.0%）。此外，与纯聚多巴胺包被膜相比，改性膜在酸和碱溶液中也表现出更好的结构稳定性。因此，本研究为提高膜的抗污染性能提供了一条简便的途径。
The low reactivity and poor compatibility of hydrophobic polymer base with hydrophilic additives poses a challenge for preparation of antifouling ultrafiltration (UF) membrane. In this work, the allyloxy nonylphenoxy propanol polyoxyethylene (SE-10N) ether ammonium sulfate (AHPS), which possessing excellent reactivity and amphiphilicity, was grafted onto PES membrane surface via dopamine triggered one-step polymerization and co-deposition process. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed that AHPS was easily anchored onto the membrane surface with the assistance of dopamine. Field emitting scanning electron microscope (FESEM) and atomic force microscopy (AFM) also demonstrated the formation of a new coating on membrane surface. The modified layer significantly enhanced the hydrophilicity of the ultrafiltration membrane, as confirmed by the decrease of contact angle from 77.2 degrees to 55.8 degrees. As a result, the modified membrane exhibited remarkably improved anti-fouling properties. The static adsorption of bovine albumin (BSA) on membrane surface was decreased from 77.2 to 34.3 mu g/cm(2). Furthermore, the modified membrane displayed higher flux recovery (95.9%) and fouling reversibility (51.6%) than unmodified membrane (56.7% and 23.0%, respectively). Besides, the modified membrane also showed better structural stability in acid and alkali solutions as compared with pure polydopamine coated membrane. Therefore, this study provided a facile approach for improving the anti-fouling performance of membranes.