Investigating the effects of ionic liquid and multi-walled carbon nanotubes oxide for oxidized hydrogen-substituted graphyne and graphene oxide for improving the adsorption and electrochemistry behaviors

Comparison between oxidized hydrogen-substituted graphyne (O-HsGY) and graphene oxide (GO) on adsorption and electrochemical properties were studied as well as the possible mechanisms were discussed on the effects of modification by deep eutectic solvents (DESs)/ionic liquids (ILs) and composition with multi-walled carbon nanotubes oxide (O-MWCNT). And the effects of DESs and ILs for GO and O-HsGY were compared. The electrical conductivity of the modification materials by DESs/ILs were improved and the aggregation of GO was prevented to some extent. The specific surface area and pore size of composite materials were larger, which could provide more active sites for the electrolyte ions and genotoxic impurities for adsorption/desorption and diffusion. Due to the different extent of expanded interlayer space after modification and better dispersity in solution, the GO-related materials have better adsorption and electrochemical capacitance properties compared with O-HsGY-related materials. There was much inductive affection of groups in DES3 which can effectively inhibit the stacking of GO sheets. And DES3-GO showed good adsorption performance for three types of aniline genotoxic impurities with the adsorption performance of 12.21 mg g −1 , 8.11 mg g −1 and 15.98 mg g −1 by static adsorption experiment, respectively. The larger surface area and pore size were obtained for the composites modified by IL and the oxidation of GO was reduced to a greater extent which improved the conductivity of GO. And the specific capacitance of 130.57 F g −1 was obtained for IL2-GO/O-MWCNT at the current density of 1.5 A g −1 . Graphical Abstract