Equilibrium and Kinetic Studies of Adsorption of Congo red by Activated Carbon prepared from Thevetia peruvianna shell

Thevetia peruvianna seed shell could be effectively employed as raw material for the of Thevetia shell activated carbon (TSC) which was utilized as biosorbent for treating synthetic waste water containing Congo Red. Thus the adsorption of Congo red (CR), a typical dye from synthetic waste water using Thevetia peruvianna shell activated carbon was studied as a function of PH, adsorbate dosage, initial dye concentration and contact time. The residual CR in solution was determined using uv-visible spectrophotometer. All batch experiments were carried out at constant temperature of 30 oc (i 2 oc) using mechanical shaker that operates at 100 rpm. The result showed that dye adsorption increased with increase in amount of adsorbent. The optimum pH for the dye adsorption was 7.0 and the biosorption was time dependent. The result Of the kinetics study showed that the pseudo-second order rate equation better described the adsorption process. Adsorption isotherm obtained fitted well into both Freundlich and Langmuir equation but match Freundlich models better. Maximum CR removed at pH 7 from 50 ml of 50 mg/l CR solution was 85.0 % for adsorbent dose of 0.2 gEO ml