Sorption dynamics of methylene blue removal using indian activated coir pith

Abstract

Experiments are conducted for discoloration of methylene blue from synthetic waste water using activated coir pith, a bioadsorbent. The experiments are performed at five different temperatures using fixed concentration of methylene blue. Maximum percentage removal at these temperatures is also evaluated. Models reported in the literature used for explaining the sorption dynamics are used to test the experimental data. It has been observed that of all the three models considered, pseudo-second order explained the experimental data satisfactorily. Pore diffusion coefficients calculated at these temperatures suggested pore diffusion to be the controlling mechanism