Anti-fouling membranes by manipulating surface wettability and their anti-fouling mechanism
Anti-fouling membranes by manipulating surface wettability and their anti-fouling mechanism
复制标题
DOI：
10.1016/j.desal.2017.02.022
复制
发表时间：
2017-07-01
期刊：
影响因子：
9.9
通讯作者：
Ge, Lei
中科院分区：
文献类型：
--
作者：
Lu, Xuemei;Peng, Yuelian;Ge, Lei
通过对多孔聚偏氟乙烯（PVDF）膜进行两种表面改性，比较其在膜蒸馏（MD）过程中的抗润湿和抗污性能。通过在膜表面动态形成含SiO2纳米粒子的1H，1H,2H，2H-全氟辛基三氯硅烷，得到了超疏水膜（SiO2- pfts /PVDF）；而超亲水性膜（PVA/PVDF）是通过在膜表面附着一层薄薄的聚乙烯醇水凝胶而形成的。在MD中，使用含有各种有机污染物（如煤油、腐植酸（HA）和十二烷基苯磺酸钠（SDBS））的NaCl水溶液，研究了表面改性对其抗润湿或防污性能的影响。结果表明，超疏水SiO2-PFTS/PVDF膜具有优异的自清洁性能和抗三种污染物的润湿性能。相比之下，PVA/PVDF膜的亲水性表面层仅在与煤油和HA接触时减缓了润湿和结垢。然而，当处理SDBS时，其抗润湿性能与SiO2-PFTS/PVDF膜相当。尽管扩展的Derjaguin-Landau-Verwey-Overbeek理论表明膜表面与这三种污染物之间存在吸引力，但超疏水SiO2-PFTS/PVDF膜仍表现出抗污染和抗润湿行为。(C) 2017 Elsevier B.V.版权所有
This study aims to compare the anti-wetting and anti-fouling surface behavior in membrane distillation (MD) by two surface modification routes on porous polyvinylidene fluoride (PVDF) membranes. A superhydrophobic membrane (SiO2-PFTS/PVDF) was obtained by dynamically forming 1H,1H,2H,2H-perfluorooctyl trichlorosilane containing SiO2 nanoparticles on the membrane surface as in our previous study; whereas a superhydrophilic membrane (PVA/PVDF) was developed by attaching a thin layer of poly(vinylalcohol) hydrogel onto the membrane's surface. The effects of surface modification on their anti-wetting or anti-fouling properties were examined in MD using an aqueous NaCl solution with various organic foulants (e.g., kerosene, humic acid (HA), and sodium dodecyl benzene sulfonate (SDBS)). The results showed that the superhydrophobic SiO2-PFTS/PVDF membrane displayed excellent self-cleaning characteristics and wetting resistance against all three studied foulants. In contrast, the hydrophilic surface layer of the PVA/PVDF membrane only slowed down wetting and fouling when in contact with kerosene and HA. Nonetheless, when dealing with SDBS, its anti-wettability performance was comparable to that of the SiO2-PFTS/PVDF membrane. The superhydrophobic SiO2-PFTS/PVDF membrane exhibited anti-fouling and anti-wetting behaviors even though the extended Derjaguin-Landau-Verwey-Overbeek theory indicated the attraction force between the membrane surface and all three foulants. (C) 2017 Elsevier B.V. All rights reserved.