Table of Contents
Journal of Applied Chemistry
Volume 2014, Article ID 767695, 9 pages
Research Article

Averrhoa carambola: A Renewable Source of Oxalic Acid for the Facile and Green Synthesis of Divalent Metal (Fe, Co, Ni, Zn, and Cu) Oxalates and Oxide Nanoparticles

1Department of Chemistry, Faculty of Science, University of Buea, P.O. Box 63, Buea, Cameroon
2Institute of Physics, Department of Chemical Physics and Material Science, University of Augsburg, 86153 Augsburg, Germany
3Department of Chemistry, E.N.S. Yaounde, P.O. Box 47, Yaounde, Cameroon

Received 27 June 2014; Accepted 2 September 2014; Published 17 September 2014

Academic Editor: Hongxing Dai

Copyright © 2014 Nguimezong Nguefack Marius Borel et al. 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.


A green, simple, and environmentally benign synthetic approach has been utilised to obtain some bivalent metal oxalates from Averrhoa carambola juice extract, without any purification or special treatment of the juice. The main acid components (oxalic acid and ascorbic acid) of the juice were identified by HPLC technique. The effect of temperature on the purity of the product has been investigated. The as-synthesized metal oxalates were thermally decomposed at low temperatures to their respective metal oxide nanoparticles. The metal oxalates and their respective thermal decomposition products were characterized by Fourier Transform Infrared spectroscopy, X-ray diffraction analysis, and thermogravimetry.