Equilibrium and Isotherm Studies on the Removal of Basic Textile Dye from Aqueous Solutions Using Kigelia africana Biosorbent

摘要

Removal of a basic textile dye Methylene Blue from an aqueous solution was evaluated using biosorbent derived from Kigelia africana in a batch system. The influence of adsorption parameters such as adsorbent dosage (0.10-0.50g), P~H (2-12) and initial dye concentration (0.3 to 0.11 g/L) on the adsorption process was studied. It was noticed that with increase in adsorbent dosage, the uptake capacity was decreased. Dye uptake was increased by changing the P~H up to 8, further increase in P~H caused reduced uptake. It was observed that, dye uptake by the adsorbent increased linearly with that of initial dye concentration. Equilibrium isotherm for the adsorption of methylene blue on to adsorbent was studied through Langmuir and Freundlich isotherm models. The data best fit with Freundlich model. Maximum adsorption capacity (Q) was found to be 119.05mg/g. SEM and FTIR analyses of the adsorbent was performed before and after the adsorption, suggest that adsorption of the dye was through chemical interaction of the functional groups on the surface of the adsorbent. From the experimental results, it was inferred that biosorbent derived from Kigelia africana can be a potential alternate to activated carbon for textile dyes removal.