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Nanomaterials 2017, 7(5), 117; doi:10.3390/nano7050117

Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels

1
Department of Fiber Science and Apparel Design, Cornell University, Ithaca, NY 14853, USA
2
Department of Chemical Engineering, Universidad de Cartagena, Cartagena 130015, Colombia
*
Author to whom correspondence should be addressed.
Academic Editor: Eva Pellicer
Received: 5 April 2017 / Revised: 10 May 2017 / Accepted: 15 May 2017 / Published: 22 May 2017
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Abstract

We report on the synthesis of alpha manganese dioxide (α-MnO2) nanorods using natural extracts from Vitis vinifera grape stems and Malus domestica ‘Cortland’ apple peels. We used a two-step method to produce highly crystalline α-MnO2 nanorods: (1) reduction of KMnO4 in the presence of natural extracts to initiate the nucleation process; and (2) a thermal treatment to enable further solid-state growth of the nuclei. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) images provided direct evidence of the morphology of the nanorods and these images were used to propose nucleation and growth mechanisms. We found that the α-MnO2 nanorods synthesized using natural extracts exhibit structural and magnetic properties similar to those of nanoparticles synthesized via traditional chemical routes. Furthermore, Fourier transform infrared (FTIR) shows that the particle growth of the α-MnO2 nanorods appears to be controlled by the presence of natural capping agents during the thermal treatment. We also evaluated the catalytic activity of the nanorods in the degradation of aqueous solutions of indigo carmine dye, highlighting the potential use of these materials to clean dye-polluted water. View Full-Text
Keywords: nanorods; manganese oxide; natural extracts; dye degradation; oriented attachment; green synthesis nanorods; manganese oxide; natural extracts; dye degradation; oriented attachment; green synthesis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sanchez-Botero, L.; Herrera, A.P.; Hinestroza, J.P. Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels. Nanomaterials 2017, 7, 117.

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