Application of deep eutectic solvents modified oxidized Hydrogen-substituted graphyne in adsorption and electrochemistry

Abstract

Deep eutectic solvents (DES), as the reaction medium, had gained considerable attention in the fabrication of advanced carbon nanostructure materials due to their designability. Here, a DES-mediated strategy was investigated to modify the oxidized hydrogen-substituted graphyne (O-HsGY). Ten kinds of DES based on choline chloride were used to modify O-HsGY and improve its adsorption and electrochemical performance. The morphology of DES-mediated oxidized hydrogen-substituted graphyne (DES-O-HsGY) were characterized by field emission-scanning electron microscopy (FE-SEM) and showed some cavity structure. Brunauer Emmett teller and X-ray diffraction characterization confirmed that the material had a relatively average pore size and a wide layer spacing (0.388 nm), which was conducive to ion transport. The adsorption and electrochemical properties of DES-O-HsGY were also studied and presented the excellent performance. The DES (Choline chloride: Ethylene glycol, 1:2) modified material had the best adsorption performance for thiabendazole, and the maximum adsorption value was 0.85 mg/g. The obtained electrochemical testing results proved that the cyclic voltammetry characteristic curve of the modified material not only had stability and deformation resistance at high scanning rate of 300 mV/s, but also had good conductivity. Therefore, the DES-mediated oxidized hydrogen-substituted graphyne had the promising prospect in the field of adsorption and electrochemistry.