Potentially Exploitable Base-Metal Containing Bentonite Clay Minerals of Ibeshi-Ikorodu South-Western Nigeria for Oil Bleaching

Inegbenebor Adedayo, Sanya Olu Olukayode P, Ogunniran Kehinde O, Inegbenebor Anthony O, 5Adekola Adefolake O


The experiment has been undertaken to evaluate the bleaching capacity of Ibeshi Montmorillonite-Bentonite clay to be used on soya bean oils (edible oils). The clay capacity for bleaching was evaluated before and after acid activation processes. The acid-activated Bentonite was prepared from raw Bentonite with sulphuric acid of concentrations 6 M, 7 M, and 8 M; this is because availability of hydrogen is a competitor at ions exchange site. Acid activation promotes catalytic activities by increasing the number of active sites of the clay samples. The results from AAS, GC-MS analysis and the spectra of the raw clay indicated that the dominant components present were Al2O3, MgO, CaO, Na2O, and K2O together with Fe2O3, TiO2, MnO2 and P2O5. The ratio of Na2O:CaO is 0.24-0.30, a value less than one, indicative the presence of montmorillonite, and the SiO2 : Al2O3 between ratio of 1.12-1.50 greater than one. The optimum acid concentration for industrial bleaching is 6 M H2SO4. However, the exchange capacity was observed at pH 7. The work has shown that activated montmorillonite/Bentonite clay has other useful organic compounds such as organic complexes 2, 4-Nonadienal; up to 8% α-Tocopherol. Tests for bleaching performance evaluation confirmed that the clay has moderately bleaching action as shown by percentage colour reduction. The colour reduction for natural clay was 9.1%, this value increases to 27.3% after 8M H2SO4 activation. Other properties include the structural characteristics, free fatty acid value, viscosity were also recorded. The availability of
Bentonite across Nigeria makes it a potential industrial mineral for the economy development.
Keyword: Bentonite, clay, dominant, components, acid-activated

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Barcroft, P., (1973), Minerals and Crystals, The Viking Press, New York, pp. 99.

Bariand, P., (1976), Marvellous World of Minerals, Abbey Library, Stuttgart, pp.55-70.

Usman, M. A., Oribayo, O., Adebayo, A. A., (2013), Bleaching of Palm oil by activation local Bentonite and Kaolin Clay from Afashio, Edo-Nigeria. Chemical and processing Research 10, pp. 1-11.

Zhansheng, W. U., Chun, I. L., Xiaolin, X. U., Xifang, S. U. N., Bin, D. A. I., Jin, L. I., Hongsheng, Z. H. A. O., (2006), Characterization, Acid Activation and Bleaching Performance of Bentonite from Xinjinag. Chinese Journal Chemical Engineering 14(2), pp. 253-258.

Christidis, G. E., Scott, P. W., Dunham, A. C., (1997), Acid Activation and Bleaching of Bentonites from the Islands of Milos and Chios, Aegean Greece. Applied Clay Science, 12 pp. 329-347

Komadel, P., Schmidt, D., Madejova, J., Cicel, B. (1990), Alteration of Smectite by treatment with Hydrochloric Acid and Sodium Carbonate solution. Applied Clay Science, 5, pp. 113-122

Azeez, B. K., Abdullahi, M. A., Jubreal, K. J., (2011), Acid Activation and Bleaching Capacity of Some Local Clays for Decolorizing used oils. Asian Journal of Chemistry, 23(6), pp. 2449-2455.

Ajemba, R. O., Onukwudi, O. O., (2012), Response Surface optimization of Palm oil bleaching using, hydrochloric acid activated Ukpor Clay

European Journal of Scientific Research, 82(3), pp. 125-339

Srasra, E., Bergaya, E., Van Damme, H., Ariguib, N.K., (1989), Surface Properties of an Activated Bentonite Decolorization Of Rape-Seed Oils. Applied Clay Science 4, pp. 411-421.

Rozic, L., Novakovic, T., Petrovic, S., (2010), Modelling and Optimization process parameter of Acid Activated of Bentonite by Response Surface Methodology. Applied Clay Science, 48, pp, 154-158.

Olokodana, F. A., (2003), Analysis of Fats and Oil: Workshop on sample preparation for the Analysis of Foods Raw and processed, Lagos Institute of Public Analysis of Nigeria pp. 17-44.

Azeez, B. K., Abdullahi, M. A., Jubreal, K. J., (2011), Acid Activation and Bleaching Capacity of Some Local Clays for Decolorizing used oils. Asian Journal of Chemistry, 23(6), pp.2449-2455.


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