Department of Environmental Science , Zhejiang University , Hangzhou , Zhejiang 310058 , China.
Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058 , China.
Environ Sci Technol. 2018 Apr 3;52(7):4265-4274. doi: 10.1021/acs.est.7b06081. Epub 2018 Mar 15.
Graphene oxide (GO) membranes are robust and continue to attract great attention due to their fascinating properties, despite their potential issues regarding stability and selectivity in aqueous-phase processing. That being said, however, the functional moieties of GO could be used for membrane surface modification, while ensuring simultaneous removal and recycling of industrial organic dyes. Herein, we present a versatile porous structured polyvinylidene fluoride-graphene oxide (PVdF-GO) nanofibrous membranes (NFMs), prepared by using simple and straightforward electrospinning approach for selective separation and filtration. The GO nanosheets were distributed homogeneously throughout the PVdF nanofiber, regulating the surface morphology and performance of PVdF-GO NFM. The PVdF-GO NFMs possesses high mechanical strength and surface free energy (SFE), consequently resulting high permeation and filtration efficiency as compared to PVdF NFM. The selectivity (99%) toward positively charged dyes based on electrostatic attraction, while maintaining rejection (100%) for negatively charged dye from mixed solutions highlight the role of GO in PVdF-GO NFM, owing to uniform pores and negatively charged surface. In addition, the actual efficiency of NFMs could be recovered easily up to three consecutive filtration cycles by regeneration, thereby assuring high stability. The high permeation, purification and filtration efficiency, good stability and recycling of PVdF-GO NFMs are promising for use in practical water purification and applications, particularly for selective filtration and recycling of dyes.
氧化石墨烯（GO）膜因其独特的性能而非常坚固，仍然受到极大的关注，尽管它们在水相处理中存在稳定性和选择性方面的潜在问题。话虽如此，GO 的功能基团可用于膜表面改性，同时确保同时去除和回收工业有机染料。在此，我们提出了一种多功能的多孔结构聚偏二氟乙烯-氧化石墨烯（PVdF-GO）纳米纤维膜（NFM），通过简单直接的静电纺丝方法制备，用于选择性分离和过滤。GO 纳米片均匀分布在 PVdF 纳米纤维中，调节了 PVdF-GO NFM 的表面形态和性能。与 PVdF NFM 相比，PVdF-GO NFMs 具有较高的机械强度和表面自由能（SFE），因此具有较高的渗透性和过滤效率。基于静电吸引对阳离子染料具有 99%的选择性，而对混合溶液中的阴离子染料保持 100%的排斥，这突出了 GO 在 PVdF-GO NFM 中的作用，这是由于其具有均匀的孔和带负电荷的表面。此外，NFMs 的实际效率可以通过再生很容易地恢复三次连续过滤循环，从而确保了高稳定性。PVdF-GO NFMs 具有高渗透性、净化和过滤效率、良好的稳定性和可回收性，有望在实际水净化和应用中得到应用，特别是用于染料的选择性过滤和回收。
