- Author(s) : O. A. Jeje A. E. Okoronkwo, and O.O Ajayi
The optimum parameters for the bleaching of cottonseed oil (CTSO) using H2SO4 modified oyster shell powder (OSP) were investigated. Elemental analysis of the shell powder was performed using Energy Dispersive Spectroscopy (EDS) and the results indicated partial destruction of aluminum octahedral sheets with subsequent dissolution of structural cations. Results of the effect of contact time studied showed optimal bleaching of OSP was achieved within 45minutes. Adsorbent dosage variation from 1.0g to 3.0g positively influenced the bleaching efficiency. The result of temperature study showed that the bleaching efficiency increases with increase in temperature from 35oC to 55oC. The thermodynamic parameters evaluated showed positive value of ?H (803.96kJ/mol) indicating that the adsorption is endothermic. The negative value of ?S (-6.668kJ/mol) suggested that the adsorption process is not reversible while positive values of change in Gibb’s free energy (?G) show that the reaction is non spontaneous. The positive value of activation energy also indicated the endothermic nature of the adsorption process and the value of sticking probability S*< 1 indicate that the probability of colour pigments to stick on the surface of the adsorbents is very high.