Different Crystallographic One-dimensional MnO2 Nanomaterials and Their Superior Performance in Catalytic Phenol Degradation

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Department of Chemical Engineering and CRC for Contamination Assessment and Remediation of the Environment (CRC CARE), Curtin University, GPO Box U1987, Perth, WA 6845, Australia
Department of Chemical Engineering, Riau University, Pakanbaru, Indonesia
§ Department of Chemical Engineering, Syiah Kuala University, Banda Aceh, Indonesia
*Phone: +61 8 92663776; fax: +61 8 92662681; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2013, 47, 11, 5882–5887
Publication Date (Web):May 7, 2013
Copyright © 2013 American Chemical Society
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Three one-dimensional MnO2 nanoparticles with different crystallographic phases, α-, β-, and γ-MnO2, were synthesized, characterized, and tested in heterogeneous activation of Oxone for phenol degradation in aqueous solution. The α-, β-, and γ-MnO2 nanostructured materials presented in morphologies of nanowires, nanorods, and nanofibers, respectively. They showed varying activities in activation of Oxone to generate sulfate radicals for phenol degradation depending on surface area and crystalline structure. α-MnO2 nanowires exhibited the highest activity and could degrade phenol in 60 min at phenol concentrations ranging in 25–100 mg/L. It was found that phenol degradation on α-MnO2 followed first order kinetics with an activation energy of 21.9 kJ/mol. The operational parameters, such as MnO2 and Oxone loading, phenol concentration and temperature, were found to influence phenol degradation efficiency. It was also found that α-MnO2 exhibited high stability in recycled tests without losing activity, demonstrating itself to be a superior heterogeneous catalyst to the toxic Co3O4 and Co2+.

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Details of catalyst preparation and characterization, UV–vis diffuse reflectance spectra, N2 adsorption/desorption isotherms and pore size distributions, TEM, and effects of phenol concentration, α-MnO2 loading and Oxone loading on phenol degradation. This material is available free of charge via the Internet at http://pubs.acs.org.

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