期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 19, 页码 16694-16703出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b03322
关键词
graphene oxide sponge; Janus membrane; water-oil emulsion separation; high purity; high permeability
资金
- National Research Foundation of Korea (NRF) grant - Korea Government (MSIP) [NRF-2014R1A2A1A10050639, IBS-R011-D1]
- Fundamental Technology Research Program through the NRF grants - MSIP [2014M3A7B4052200]
- Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R011-D1-2017-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2014M3A7B4052200, 2014R1A2A1A10050639] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Membrane separation of oil and water with high purity and high permeability is of great interest in environmental and industrial processes. However, membranes with fixed wettability can separate only one type of surfactant-stabilized emulsion (water-in-oil or oil-in-water). Here, we report on Janus graphene oxide (J-GO) sponges for high purity and high permeability separation of both water-in-oil and oil-in-water emulsions. Millimeter-scale reduced GO sponges with a controlled pore size (11.2 or 94.1 mu m) are synthesized by freeze drying, and the wettability is further controlled by fluorine (hydrophobic/oleophilic in air) or oxygen (hydrophilic/oleophilic in air) functionalization. J-GO sponges are prepared by the fluorine functionalization on one side and oxygen functionalization on the other side. Interestingly, the oil wettability of oxygen-functionalized surface turns into an oleophobic surface when immersed in water, which is explained by Young's theory. This effect is further used in the separation of both water-in-oil and oil-in-water emulsions by changing the flow direction. The purity of the separated oil and water is very high (>= 99.2%), and the permeability is more than an order of magnitude greater than those of the other Janus membranes reported. J-GO sponges can be reused with an excellent repeatability, demonstrating feasibility in practical applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据