Evaluation of Kinetic Parameters of Endosulfan Biosorbed on Biosorbent Prepared from Aspergillus nidulans

The biosorption of endosulfan from aqueous solution on biosorbent prepared from fungal culture Aspergillus nidulans(ANS) was studied in a batch system with respect to different initial concentrations, adsorbent size, agitation and interruption. The kinetic parameters of sorption process such as equilibrium times and different diffusion coefficients were evaluated. The pseudo-first-order, pseudo-second-order kinetic model and the intraparticle diffusion model were used to describe the kinetic data and the rate constants were estimated. The experimental data fitted very well the pseudo-second-order kinetic model and also followed the intraparticle diffusion model up to 12 hrs. The intra-particle diffusion along with the external diffusion was determinant of the overall rate of the biosorption of endosulfan on to ANS biosorbent.