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In this paper, the adsorption of copper ions on the prepared multilayer diazo resin-graphene oxide/polyacrylonitrile composite membranes was studied, and the adsorption capacity of GO modified polyacrylonitrile membranes to copper ions under different conditions was explored. The concentration of copper ion solution before and after adsorption was measured by inductively coupled plasma (ICP). The results showed that the adsorption capacity of GO modified polyacrylonitrile membrane to copper ion increased first and then reached adsorption equilibrium with the increase of adsorption time of copper ion. With the increase of initial concentration of copper ion and external temperature, the adsorption capacity of GO modified polyacrylonitrile membrane to copper ion followed. With the increase of solution's PH, the adsorption capacity of GO modified polyacrylonitrile membranes for copper ions first increased and then decreased. After several desorption/adsorption of the modified membranes which have reached the adsorption equilibrium, the membranes still have good adsorption capacity for copper ions, indicating that the membranes have excellent reuse performance. [ABSTRACT FROM AUTHOR]

PAN hollow fiber functional membrane with heavy metal ion adsorption capacity was prepared via layer-by-layer method using diazo-resin (DR). Ethylenediaminetetraacetic acid (EDTA) and graphene oxide (GO) with chelating function were used as modifier. Modification effect was studied by Fourier Transform Infrared Spectrometer (FTIR), contact angle test, scanning electron microscopy (SEM) and the copper ion adsorption capacity measurement. The result showed that EDTA and GO were successfully grafted on the surface of modified membrane and the hydrophilicity of the modified membrane increased. Roughness of membrane surface increased when the functional groups introduced on the surface. Adsorption for Cu2+ of modified membrane significantly improved. [ABSTRACT FROM AUTHOR]