Adsorption of an Organic Pollutant from Aqueous Solutions

Casein was employed as an adsorbent in this study for the removal of methylene blue dye. zero charge point were used to characterize it. The influence of experimental parameters such as contact time, pH, the dose of adsorbent and stirring speed on the adsorption yield of methylene blue MB on casein were investigated. Equilibrium was established after 30 minutes with a discoloration percentage of 81.24%. an optimal dose of 7.5g/l of casein will be necessary to fix the maximum of Methylene Blue. The stirring speed of 200rpm is optimal and sufficient to promote contact between the casein particles and the dye The best decolorization was observed at pH=8.1 with a yield of 85.76%. The kinetic study revealed that the surface reaction fits the pseudo second order model.