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A novel Mn3O4-MnO2 valence state heterojunction was fabricated for the first time by a low-temperature hydrothermal method and further applied for methylene blue (MB) degradation under visible light irradiation at room temperature. The Mn3O4 core with tetragonal hausmannite structure was coated by a thin amorphous MnO2 shell. The specific surface area and light-response range of Mn3O4-MnO2 photocatalyst...
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