Ultra-long α-MnO2 nanowires: Control synthesis and its absorption activity

• Ultralong α-MnO2 nanowires longer than 100 μm were prepared by a hydrothermal route.
• The α-MnO2 nanowires can be assembled into free-standing membrane.
• The α-MnO2 exhibited excellent absorption ability and reusability for methyl violet.

Ultralong α-MnO2 nanowires with length longer than 100 μm have been prepared in gram-scale using a facile hydrothermal method without any template. The MnO2 was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Time-dependent experiment was made to study the growth process of the nanowires. The ultralong nanowires were assembled into free-standing membrane through hydrogen bond and used for adsorption of methyl violet. The MnO2 nanowires exhibited excellent absorption ability and reusability for the dye of methyl violet. Even within 5 cycles, the absorption rate of α-MnO2 maintains still as high as 99%.

Ultralong α-MnO2 nanowires were successfully fabricated by the facile hydrothermal method and assembled into freestanding membrane. The preparedα-MnO2 exhibited excellent absorption ability and reusability for the dye of methyl violet. Figure optionsDownload as PowerPoint slide