Removal of Methylene Blue Dye from Aqueous Solution by Adsorption Using Low Cost Adsorbent Obtained from Andrographis paniculata LEAVES

The objective of this work is to study the removal of methylene blue dye from aqueous solution using low cost adsorbent obtained from the leaves of Andrographis paniculata. Batch adsorption studies were carried out by observing the effects of various experimental parameters, such as dye concentration, contact time, adsorbent dose, effect of temperature and pH. The data were fitted into the Langmuir and Freundlich adsorption isotherm equations. Thermodynamic parameters like change in free energy, enthalpy and entropy were calculated. The experimental data were fitted into the pseudo first model. Results indicate that Andrographis paniculata is a promising adsorbent for the removal of MB from an aqueous solution.