Influence of graphene oxide sheets on the pore structure and filtration performance of a novel graphene oxide/silica/polyacrylonitrile mixed matrix membrane
Influence of graphene oxide sheets on the pore structure and filtration performance of a novel graphene oxide/silica/polyacrylonitrile mixed matrix membrane
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氧化石墨烯片对新型氧化石墨烯/二氧化硅/聚丙烯腈混合基质膜孔结构和过滤性能的影响
DOI：
10.1007/s10853-018-1990-4
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发表时间：
2018-05-01
影响因子：
4.5
通讯作者：
Wang, Tonghua
中科院分区：
文献类型：
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作者：
Liu, Qiao;Li, Lin;Wang, Tonghua
以氧化石墨烯（GO）/二氧化硅（SiO2）/聚丙烯腈（PAN）杂化膜为原料，采用非溶剂诱导相分离法（NIPS）原位制备了具有高通量和优良分离性能的GO/SiO2/PAN杂化膜。采用扫描电镜、场发射扫描电镜、原子力显微镜、能谱仪、傅里叶变换红外光谱仪、纯水接触角和过滤性能等测试手段，研究了GO片对GO/SiO2/PAN MMM的孔结构、化学结构、亲水性和过滤性能的影响。结果表明，通过NIPS将GO片和SiO2分子原位掺入PAN基体中，使GO/SiO2/PAN MMM的孔结构得到了重构，具有直立的指状孔、多孔的底部、较薄的顶层和较高的孔隙率。NIPS过程中亲水性GO片层和SiO2分子的自发表面迁移或分离，以及它们之间的协同作用，极大地改善了膜的表面结构和性能，使膜表面更加光滑，孔结构均匀，亲水性良好。所得GO/SiO2/PAN MMM具有387 L m− 2 h − 1的高水过滤通量，牛血清白蛋白截留率高达99%，并显著提高了过滤性能。
The novel graphene oxide (GO)/silica (SiO2)/polyacrylonitrile (PAN) mixed matrix membranes (MMMs) with high filtration flux and excellent antifouling performance were designed and fabricated in situ by the method of non-solvent induced phase separation (NIPS) from the precursor of PAN hybridized with GO, tetraethoxysilane and 3-aminopropyltriethoxysilane. The influences of GO sheets on the pore and chemical structure, hydrophilic nature and filtration performance of derived GO/SiO2/PAN MMMs were investigated by the scanning electron microscopy, field emission scanning electron microscopy, atomic force microscopy, energy-dispersive X-ray, Fourier transform infrared spectrometer, pure water contact angles and filtration performance. Results indicated that in situ incorporation of GO sheets and SiO2molecules into PAN matrix via NIPS reconstructs the porous structure of derived GO/SiO2/PAN MMMs with the upright finger-like holes, porous bottom, thinner top layer and high porosity. The spontaneous surface migration or segregation of hydrophilic GO sheets and SiO2molecules as well as their synergistic interaction occurred during NIPS greatly ameliorate the top surface structure and property of derived membranes with smoother surface, uniform pore structure and good hydrophilicity. The derived GO/SiO2/PAN MMMs exhibit a high water filtration flux of 387 L m−2h−1with the bull serum albumin rejection rate up to 99% and significant enhancement of antifouling performance.