Greatly Improved Oil-in-Water Emulsion Separation Properties of Graphene Oxide Membrane upon Compositing with Halloysite Nanotubes
Graphene oxide (GO)-based membranes provide an encouraging opportunity for oil-in-water emulsion separation with high separation efficiency. In this work, novel hierarchically structured membrane consisting of GO and halloysite nanotubes (HNTs) was successfully fabricated by vacuum-assisted filtration method. XRD and TEM measurements showed the successful intercalation of HNTs into the interlayers of GO nanosheets. With the incorporation of the one-dimensional hollow tubular structure halloysite nanotubes, GO-HNTs(GOH) membrane possessed combined advantages of high oil rejection rate and excellent fouling resistance properties. The permeate fluxes increased from 286.6 L/(m2·h) for GO membrane to 716 L/(m2·h) for GOH membrane. The results indicate that the GOH membranes have great potential applications in water purification and wastewater treatment.
KeywordsGraphene oxide Halloysite nanotubes Oil/water separation Intercalation
This work was financed by National Natural Science Foundation of China (Grant No. 5140003), Anhui Provincial Natural Science Foundation (1508085QE105), Scientific Research Fund of Anhui Provincial Education Department (KJ2016A791, KJ2017A030), Anhui Province Institute of High Performance Rubber Materials and Products, and The 211 Project of Anhui University.
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