Abstract
Homogeneous flower-like OMS-2 particles were successfully prepared in a short time of merely 4 h using a hydrothermal method under a MnSO4–K2S2O8–K2SO4–H2SO4 system. The flower-like OMS-2 particles with a diameter of around 2 μm were composed of uniform slender cryptomelane rods several hundred nanometers in length when the pH of the precursor solution was 0.18 and the solution was treated at 443 K. XRD and SEM characterization techniques demonstrated that formation of flower-like OMS-2 involved three stages including formation of fiber-like OMS-2, flower-like pyrolusite-type MnO2 and flower-like OMS-2 with decreasing pH value from 4.08 to 0.18. In the case of reaction time, the redox reaction between Mn2+ and S2O82− was accomplished within the initial 1 h, and the highly crystallized uniform flower-like particles were obtained at 4 h.
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