Adsorption of Co(II) on Graphene Oxides from Aqueous Solution
Hua Zhu1, Xuetao Xu2, Xin Zhong1
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1School of Chemistry and Chemical Engineering, Sichuan University of Arts and Sciences,
Dazhou 635000, P.R. China
2School of Chemical and Environmental Engineering, Wuyi Unicersity,
Jiangmen 529020, P.R. China
Submission date: 2016-04-20
Final revision date: 2016-06-15
Acceptance date: 2016-06-15
Publication date: 2016-11-24
Pol. J. Environ. Stud. 2016;25(6):2675-2682
Graphene oxide (GO) was synthesized and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), and Fourier transformed infrared spectra (FT-IR). The adsorption of Co(II) on GO was studied as a function of contact time, pH, ionic strength, humic acid, Co(II) concentration, and temperature. The adsorption of Co(II) is strongly dependent on the pH values and weakly dependent on ionic strength. The adsorption thermodynamics of Co(II) on GO was carried out at 303, 313, and 333 K to obtain the corresponding thermodynamic data (ΔH0, ΔS0, and ΔG0), which suggested that the adsorption of Co(II) on GO is a spontaneous and endothermic process. GO provided a promising candidate for the preconcentration and solidification of Co(II) from large volumes of aqueous solutions.
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