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Influence of temperature and pH on the morphology and the color of the CoAl2O4 prepared by sol gel method

El Jabbar, Youssef and El Ouatib, Rachida and Er-Rakho, Lahcen and Durand, Bernard Influence of temperature and pH on the morphology and the color of the CoAl2O4 prepared by sol gel method. (2015) Journal of Materials and Environmental Science - JMES, 6 (12). 3452-3456. ISSN 2028-2508

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Official URL: https://www.jmaterenvironsci.com/Document/vol6/vol6_N12/394-EL%20Jabbar.pdf


The aim of this study consists in the synthesis of CoAl2O4 spinel by sol gel method using polyacrylic acid as chelating agent, with focusing on the influence of calcination temperature and pH on the morphology and on the color of the powders obtained. The prepared powders have been characterized by X- ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) and colorimetry (L*a*b*). The results obtained show that the spinel phase appears from 500 °C. FTIR spectroscopy reveals oxygen-metal bands characteristic of the spinel structure. The TEM micrographs of powders, synthesized at the temperatures 800°C, 900°C and 1100°C at pH=2,7 and 10, show that these powders are formed of nanometric particle size with a distribution between 20 nm and 90 nm. The colorimetric parameters, measured on powders calcined at 1100 ° C and regardless of the pH values, show an important blueness.

Item Type:Article
HAL Id:hal-02094945
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Université Hassan II Casablanca - UH2C (MOROCCO)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:10 Apr 2019 08:11

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