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- Title
Characterization of radioactive cobalt on graphene oxide by macroscopic and spectroscopic techniques.
- Authors
Jin, Zhongxiu; Sheng, Jie; Sun, Yubing
- Abstract
Graphene oxide (GO) was synthesized using the modified Hummers method and characterized by XRD and FTIR. The sorption of Co(II) on GO as a function of contact time, pH, polyacrylic acid, ionic strength, temperature and solution concentration was studied by batch technique. The sorption kinetics indicated that the sorption of Co(II) on GO could be simulated by the pseudo-second-order model very well. The maximum sorption capacities of GO for Co(II) calculated from Langmuir model at pH 6.40 and T = 300 K was ~62.0 mg/g. The thermodynamic parameters from the temperature-dependent sorption isotherms indicated that the Co(II) sorption on GO was an endothermic and spontaneous process. The interaction mechanism between GO and Co(II) were outer-sphere surface complexation or ion exchange at pH <7, whereas the inner-sphere surface complexation was observed at pH 7-9 in terms of the analysis of XPS spectra.
- Subjects
RADIOACTIVE elements; COBALT; GRAPHENE oxide; FOURIER transform infrared spectroscopy; METAL absorption &; adsorption; TEMPERATURE effect; SORPTION
- Publication
Journal of Radioanalytical & Nuclear Chemistry, 2014, Vol 299, Issue 3, p1979
- ISSN
0236-5731
- Publication type
Article
- DOI
10.1007/s10967-013-2918-8