Effects of graphene oxide incorporation on the mat structure and performance of carbon nanotube composite membranes
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The novel composite membranes were prepared using multi-walled carbon nanotubes (MWCNTs) alone or incorporating graphene oxide (GO) via vacuum filtration-assisted method. The structure and chemical composition of the mats atop the nylon microfiltration membranes were characterized, and a dynamic filtration process was employed to evaluate the performance of the membranes. Results showed that the intra-bundle type of pore in the size range of 20–30 nm dominated in the porous MWCNT mats, and hydroxylated MWCNTs were stacked in a fluffier structure with stronger hydrophilic behavior, as compared to the pristine ones. Although the lamellar-like mats without visible defects resulted in a lower water permeability and higher filtration resistance of MWCNT/GO membranes, the convoluted and lengthy pathways for water transfer increased their equilibrium adsorption capacities for small molecules of fulvic acid, as suggested by the pseudo-second-order kinetics fitting. In all, the obtained experimental evidence would be instructive to optimize the design of composite membranes for application in water purification.
KeywordsCarbon nanotubes Graphene oxide Mat structure Water permeability Adsorptive filtration
This study was supported by the National Natural Science Foundation of China (51608341, 41701545), and the Natural Science Foundation of Jiangsu Province, China (BK20150284). The authors also acknowledge support from the funding project for the Innovation and Entrepreneurship doctorate holders of Jiangsu Province, China.
- 2.N.M. Mubarak, J.N. Sahu, E.C. Abdullah, N.S. Jayakumar, P. Ganesan, Res. Chem. Intermediat. 42, 9817 (2015)Google Scholar