Synthesis of Graphene Oxide–Supported β-Cyclodextrin Adsorbent for Removal of p-Nitrophenol
2020
Tian, Haizhou | Zeng, Huichong | Zha, Fei | Tian, Haifeng | Chang, Yue
Graphene oxide–supported β-cyclodextrin was prepared with graphene oxide and β-cyclodextrin as raw materials and epichlorohydrin as crosslinking agent, respectively. It was characterized by the methods of Raman spectroscopy, FT-IR, and SEM. The graphene oxide–supported β-cyclodextrin showed excellent adsorption performance for p-nitrophenol, and the absorption equilibrium can be achieved within 2 h. The adsorptive capacity is 117.28 mg/g at adsorption temperature of 313 K and pH at 8.0. Adsorption isotherms showed that the adsorption capacity increases with the increases of temperature and adsorption process could be better fitted by Langmuir isotherm (R² > 0.995). Thermodynamic functions (ΔG, ΔH, and ΔS) investigation showed that the adsorption is spontaneous, endothermic, and random. The adsorption kinetics of p-nitrophenol over graphene oxide–supported β-cyclodextrin is conformed to a pseudo-second-order process. This study has suggested that the graphene oxide–supported β-cyclodextrin could play an efficient and beneficial source of the adsorbent for the purpose of eliminating p-nitrophenol from aqueous solution.
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