Kinetically and thermodynamically investigation of adsorption of some toxic dyestuffs from aqueous solution by chitin and its derivatives

In this study the adsorptions of some toxic dyestuffs (Indigo Carmine and Trypan Blue) by chitin and modified chitin from aqueous solution were investigated as dependent on temperature and pH. Kinetical data obtained for each dyestuff at different temperatures were applied to Lagergen, Ho-McKay, Weber-Morris equations and kads,1 ,kads,2 and pore diffusion rate constants kp at these temperatures were determined respectively. Due to the adsorptions of indigo carmine and trypan blue fitted to Ho- McKay equation, adsorption rate constants obtained from this equation applied to Arrhenius equation and activation energies (Ea) related to the adsorptions of Indigo Carmine and Trypan Blue on chitin were determined. Furthermore, isotherm study for each dyestuff was done and isotherm curves at different temperatures were obtained. After kinetic and isotherm studies, the effect of pH on the adsorption of Indıgo Carmine and Trypan Blue was inhvestigated and kinetical data were obtained for each dyestffs at different pHs. Then chitin was modified and its surface property was changed. The adsorption of Indigo Carmine and Trypan Blue by modified chitin (MAC and BAC) from aqueous solution was kinetically investigated. Kinetical data obtained for each dyestuff at different temperatures were applied to Lagergen, Ho-McKay, Weber-Morris equations and kads,1 ,kads,2 and pore diffusion rate constants kp at these temperatures were determined respectively.