▎ 摘　　要

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 20-30nm 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.