| Cyclodextrins were modified on aminated carbon fiber with six methylene diisocyanate as coupling agent (CDs/CFs). Electrodeposit CuO/Cu2O nanocomposites on CDs/CFs in situ for preparation of materials (CuO/Cu2O/CDs/CFs). The structure and morphology of materials were characterized by fourier transform infrared spectrum (FT-IR), field emission scanning electron microscope (FE-SEM), X-ray crystal diffraction (XRD), X-ray photoelectron spectrometer (XPS) and electrochemical technology. Cyclodextrin was coated at surface of CFs with a mesh structure of 100 ± 20 nm. Nano cube-like Cu2O particles were evenly distributed at surface of CDs/CFs, then, spiny CuO particles were generated by the oxidized of Cu2O in situ. Uptake of 2,6-dichlorophenol (2,6-DCP) towards CDs/CFs, and photocatalytic degradation of 2,6-DCP towards CuO/Cu2O/CDs/CFs were investigated, respectively. Under 25 ℃ and pH 7, the maximum uptake capacity was 43.07μmol/g. The adsorption process well fitted the second-order kinetics model and Langmuir adsorption model with an endothermic and spontaneous reaction. Under irradiation of 365 nm UV lamp and 12 h, the photocatalytic degradation rate could reach 87.5% using CuO/Cu2O/CDs/CFs.Both aminated graphene and aminated carbon fibers were crosslinked together to form composite support (GNs/CFs) using glutaric dialdehyde, prussian blue was electrodeposited to form prussian blue functionalized graphene/carbon fibers composite (PB/GNs/CFs) in situ. The resultant materials were characterized by FT-IR, FE-SEM, XRD, XPS and electrochemical techniques. Number of cubic prussian blue particles were uniformly electrodeposited at surface of GNs/CFs with an average size of 19.32 nm. Selective adsorption and desorption behaviors of cesium (Cs+) were investigated at PB/GNs/CFs in aqueous solution, respectively. The maximum adsorption capacity could reach to 81.24 ± 2 mg/g at 25 ℃ and pH 7 with an endothermic and spontaneous process. The desorption percentage could reach 89.29% using electrically switched ion exchange at 1.2 V with 8 min in pH 2,0.1 M KC1. At the optimum conditions, PB/GNs/CFs was successfully utilized to recover cesium from the residual of salt lake brine which lithium had been removed from Qarham playa of Qaidam Basin. |
