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Hydrothermal preparation of nanostructured manganese oxides (MnOx) and their electrochemical and photocatalytic properties by Khalid Abdelazez Mohamed Ahmed; Hong Peng; Kangbing Wu; Kaixun Huang is a Engineering article available to read on EtoBox.

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Manganese oxides nanomaterial (MnO x ) with crystalline phases of MnOOH nanorod and Mn 3 O 4 octahedron-like were synthesized by hydrothermal method based on the redox reaction between MnO 4 and CH 2 O at 120 • C and 200 • C for 10 h, respectively. The ␤-MnO 2 nanowires were prepared by calcining MnOOH nanorods at 300 • C for 3 h in air. Particles were characterized by XRD, FE-SEM, TEM, SA-ED, HR-TEM, Brunauer-Emmett-Teller (BET) and UV-vis diffuse reflectance spectroscopy. Their capability of catalytic degradation of alizarin yellow R with air oxygen in aqueous under visible light irradiation and electrochemical properties of as-prepared nanocrystal modified with carbon paste electrode were comparatively studied. The degradation products were determined by GC-MS. In addition, some influences factors, such as pH and temperature on the photocatalytic degradation were also investigated. Among the as-prepared MnO x nanostructures, ␤-MnO 2 nanowire exhibit higher specific capacitance and better catalytic activity than Mn 3 O 4 octahedron-like and MnO(OH) nanorod. The hydroxyl radical mechanism of the photocatalytic degradation of alizarin yellow R was detected and discussed.

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Author

Khalid Abdelazez Mohamed Ahmed; Hong Peng; Kangbing Wu; Kaixun Huang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1385-8947)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)