期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 282, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.120122
关键词
Adsorption; Graphene; Heavy metals; Capacitive deionization
资金
- National Natural Science Foundation of China [51808251, 21605084]
- Special basic research service for the Central Level Public Welfare Research Institute [GYZX210517]
- Natural Science Foundation of Jiangsu Province for Young Scholars of China [BK20170111]
- Youth Science and technology talent promo-tion project of Jiangsu Association for science and Technology
- National Water Pollution Control and Treatment Science and Technol-ogy Major Projects of China [2017ZX07301006]
- [2017ZX07203004]
In this study, rGO/NCDs composites were successfully synthesized for optimizing the preparation process of CDI electrode, exhibiting excellent electrochemical properties and superhydrophilic property. The CDI tests showed that the electrosorption capacity of rGO/25%NCDs electrode was higher, indicating a good removal effect on Pb2+ pollutants.
Capacitive deionization (CDI) technology is an effective method for the removal of Pb2+ from slightly-polluted water. In this study, reduced graphene oxide/nitrogen-doped carbon quantum dots (rGO/NCDs) composites with different NCDs mass ratios were successfully synthesized by hydrothermal method and the preparation process of CDI electrode was optimized by electrospinning method to obtain monolithic mesh-like structure. The results showed that the doping of NCDs improved the structural and electrochemical properties of the composites. rGO/ 25%NCDs composite possessed well-developed three-dimensional porous structure, high specific surface area (347.65 m(2)/g) and excellent specific capacitance (284.0 F/g). The prepared CDI electrodes had a fish scale-like graded interfacial structure, and this unique structure made the electrodes exhibit superhydrophilic property. The results of CDI tests showed that the electrosorption capacity of rGO/25%NCDs electrode could reach 19.26 mg/g which was higher than that of the pure rGO electrode and many reported electrodes, when the initial concentration of Pb2+ was 5 mg/L and the voltage was-1.0 V. The adsorption process was consistent with the Langmuir adsorption isotherm and the pseudo-first-order kinetic model. In addition, the study on the competitive adsorption in a co-existed system revealed that the electrosorption capacity was strongly dependent on the ionic valence rather than hydrated radius.
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