Abstract:

In this paper, through calcining the ellipsoid-like MnCO₃ precursors at 500°C, the ellipsoid-like ε-MnO₂ catalysts with an excellent property to decompose methylene blue can be obtained. ε-MnO₂is measured by SEM, XRD, UV-Vis and BET. The results show that the ellipsoid-like ε-MnO₂catalysts possess a high surface area of ca.88 m²/g. The obtained ellipsoid-like ε-MnO₂ materials are used as catalysts to decompose methylene blue in the present property  of H₂O₂.And the ellipsoid-like ε-MnO₂ can remove about 92% of methylene blue, which shows excellent property to remove methylene blue at room temperature. This shows that ellipsoid-like ε-MnO₂ is a highly efficient catalyst removal of methylene blue.

Key words: epsilon-manganese oxide (ε-MnO₂); ellipsoid-like; catalytic degradation; methylene blue