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Manganese dioxide has attracted much attention owing to its distinctive properties. A facile method was developed to synthesis  γ -MnO 2  by the reaction of Na 2 S 2 O 8  with Zn-bearing MnSO 4 , keeping the molar ratio of Mn to S as 1:2-4. The oxidation of Mn 2+  increased from 62.3% to 99.9% with the increase of the final solution pH from 0.55 to 4.45. The needlelike  γ -MnO 2  particles with a length of 200-500 nm and a diameter of 10-30 nm were synthesized in the initial solution pH range of 3.5-4.0.  γ -MnO 2  particles with poor crystallinity and porous morphology were synthesized in the initial solution pH range of 6.0-6.5. The Zn 2+  adsorption capacities of the  γ -MnO 2  formed at initial pH = 3.5 and pH = 6.0 were 131.8 mg.g −1  and 527.4 mg.g −1 , respectively.

Effect of pH on formation of γ-MnO2from Zn-bearing MnSO4solution

Effect of pH on formation of γ-MnO₂from Zn-bearing MnSO₄solution