Ultra-low graphene oxide loading for water permeability, antifouling and antibacterial improvement of polyethersulfone/sulfonated polysulfone ultrafiltration membranes
Ultra-low graphene oxide loading for water permeability, antifouling and antibacterial improvement of polyethersulfone/sulfonated polysulfone ultrafiltration membranes
复制标题
超低氧化石墨烯负载量改善聚醚砜/磺化聚砜超滤膜的透水性、防污抗菌性
DOI：
10.1016/j.jcis.2019.05.065
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发表时间：
2019-09-15
影响因子：
9.9
通讯作者：
Matsuyama, Hideto
中科院分区：
文献类型：
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作者：
Hu, Mengyang;Cui, Zhenyu;Matsuyama, Hideto
以氧化石墨烯（GO）水分散液为添加剂，采用非溶剂诱导相分离法（NIPS）制备了具有抗菌和抗菌性能的聚醚砜（PES）/磺化聚砜（SPSf）/GO混合膜。研究了不同GO含量对MMM形貌和性能的影响。结果表明，随着GO浓度的增加（从0到0.016wt%），铸膜液的粘度呈现出增加的趋势，这是由于GO、H2O和SPSf之间的氢键（H-bonding）相互作用所致。拉曼和分子动力学（MD）模拟分析证实了SPSf、GO和H2O之间存在氢键相互作用。具体地，GO的附聚被抑制并且获得稳定的均匀铸膜溶液。同时，氢键的相互作用也对MMM的结构和性能的改善起到了关键作用。结果表明，GO纳米片均匀嵌入非对称PES/SPSf/GO MMM中，形成许多蜂窝状空隙，具有海绵状结构。在0.1MPa压力下，GO含量为0.0 12 wt %的MMM纯水通量可达816.9L/m2 h，对牛血清白蛋白（BSA）的截留率大于99.2%。此外，随着GO含量的增加，MMM的力学性能也有所提高。重要的是，MMM显示出优异的抗菌和抗菌性能。对大肠杆菌（Escherichia coli，E.结果表明，GO纳米粒子具有良好的亲水性、负电荷和纳米尺寸效应。总之，我们的研究提供了一种简单的方法来定制MMM，其在非常低的GO含量下具有增强的渗透性、渗透性和抗菌性。(C)2019爱思唯尔公司All rights reserved.
The aqueous dispersion of graphene oxide (GO) was employed as additive to fabricate antifouling and antibacterial polyethersulfone (PES)/sulfonated polysulfone (SPSf)/GO mixed matrix membranes (MMMs) by the non-solvent induced phase separation (NIPS). The effect of different amounts of GO on the morphology and performance of MMMs were studied. The results showed that the casting solution exhibited an increasing trend in viscosity with increment in GO concentration (from 0 to 0.016 wt%) owing to the hydrogen bonding (H-bonding) interaction among GO, H2O and SPSf. Raman and molecular dynamic (MD) simulations analyses confirmed that there existed H-bonding interaction among SPSf, GO and H2O. Specifically, the agglomeration of GO was inhibited and stable homogeneous casting solution was obtained. Meanwhile, the H-bonding interaction also played a key role in the MMMs structure and improved properties. It was found that GO nanosheets were uniformly embedded to form many cellular-like voids in the asymmetric PES/SPSf/GO MMMs with a sponge-like structure. The pure water flux of the MMMs with a very low GO content of 0.012 wt% was up to 816.9 L/m 2 h and the rejection of bovine serum albumin (BSA) was more than 99.2% under a pressure of 0.1 MPa. Additionally, the mechanical properties of MMMs was also improved with the increase of GO content. Importantly, the MMMs displayed excellent antifouling and antibacterial performance. A high fouling recovery (94.2%) and antibacterial rate (90.0%) against Escherichia coli (E. coli) obtained were attributed to improved hydrophilicity, enhanced negative charge and GO nano-size effect. In summary, our study provides a simple approach to tailor MMMs with the enhancement of permeation, antifouling and antibacterial properties at a very low content of GO. (C) 2019 Elsevier Inc. All rights reserved.