▎ 摘　　要

Four novel electron-withdrawing/donating groups-graphene-oxide-oxidized-multiwalled carbon nanotubes (EWG/EDG-GO-o-MWCNTs) nanocomposites were synthesized via Aldol reaction. The EWG and EDG were successfully grafted onto GO-o-MWCNTs, which were investigated by fourier transform infrared spectroscopy (FTIR) and element analysis (EDX). The effect of EWG and EDG on the size of the x system of GO was investigated by electrochemical test and static adsorption experiment. The charge transfer resistance (RCT) of EDG-GO-o-MWCNTs was significantly smaller than EWG-GO-o-MWCNTs from electrochemical impedance spectroscopy (EIS), which indicated that EDG enhanced the electron density to the pi system of GO, increased the electron density of GO and improved the electron transfer rate of GO. EWG eliminated the electron density of the pi system of GO, which resulted in the slowed down of electron transfer. The static adsorption showed the different adsorption capacities for furosemide (2, 4DMOA-GO-o-MWCNTs (26.16 mu g/mL) > 3, 4, 5TFPh-GO-o-MWCNTs (22.61 mu g/mL) > 4MPh-GO-o-MWCNTs (18.30 mu g/mL) > 4AcPh-GO-o-MWCNTs (10.66 mu g/mL) > GO (4.39 mu g/mL)). The results indicated that EWG/EDG-GO-o-MWCNTs nanocomposites could easily adsorb furosemide by hydrogen bonding and pi-pi interactions. Electrochemical tests and static adsorption experiment indicated that the pi system of GO could be changed by EWG and EDG.