Abstract
A novel γ-MnO2 hollow structure has been synthesized using a simple chemical reaction between MnSO4 and KMnO4 in aqueous solution without using any templates, surfactants, catalysts, calcination and hydrothermal processes. As an example of potential applications, γ-MnO2 hollow structure was used as adsorbent in radionuclide 60Co(II) treatment, and showed an excellent ability. The effect of pH, contact time, ionic strength, humic acid (HA)/fulvic acid (FA), and temperature was investigated using batch techniques. The results indicated that the sorption of 60Co(II) on γ-MnO2 was obviously dependent on pH values but independent of ionic strength. The presence of HA/FA enhanced the sorption of 60Co(II) on γ-MnO2 at low pH, whereas reduced 60Co(II) sorption on γ-MnO2 at high pH. The kinetic sorption of 60Co(II) on γ-MnO2 can be well fitted by the pseudo-second-order rate equation. The thermodynamic parameters (ΔH0, ΔS0, ΔG0) were also calculated from the temperature dependent sorption isotherms, and the results suggested that the sorption of 60Co(II) on γ-MnO2 was a spontaneous and endothermic process. The sorption of 60Co(II) on γ-MnO2 was attributed to surface complexation rather than ion exchange.
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