Pseudo-second order models for the adsorption of safranin onto activated carbon: comparison of linear and non-linear regression methods.
Kinetic experiments were carried out for the sorption of safranin onto activated carbon particles. The kinetic data were fitted to pseudo-second order model of Ho, Sobkowsk and Czerwinski, Blanchard et al. and Ritchie by linear and non-linear regression methods. Non-linear method was found to be a better way of obtaining the parameters involved in the second order rate kinetic expressions. Both linear and non-linear regression showed that the Sobkowsk and Czerwinski and Ritchie's pseudo-second order models were the same. Non-linear regression analysis showed that both Blanchard et al. and Ho have similar ideas on the pseudo-second order model but with different assumptions. The best fit of experimental data in Ho's pseudo-second order expression by linear and non-linear regression method showed that Ho pseudo-second order model was a better kinetic expression when compared to other pseudo-second order kinetic expressions.
Kumar
K Vasanth
KV
Department of Chemical Engineering, AC Tech, Anna University, Chennai 600025, TN, India. vasanth_vit@yahoo.com
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D008956:Models, Chemical; D010619:Phenazines / Q000737:chemistry*; D012044:Regression Analysis
D010619:Phenazines; D002244:Carbon; C009195:safranine T