Use of papaya seeds as a biosorbent of methylene blue from aqueous solution

Diego S Paz, Alexandre Baiotto, Marcio Schwaab, Marcio A Mazutti, Mariana M Bassaco, Daniel A Bertuol, Edson L Foletto, Lucas Meili
Water Science and Technology: a Journal of the International Association on Water Pollution Research 2013, 68 (2): 441-7
In this study papaya seeds were used to remove methylene blue dye from aqueous solution. Papaya seeds were characterized as possessing a macro/mesoporous texture and large pore size. Studies were carried out in batches to evaluate the effect of contact time and pH (2-12) on the removal of dye. It was observed that the adsorption of dye was better in the basic region (pH 12). The equilibrium data were analyzed using Langmuir, Freundlich, Dubinin-Raduschkevich, Tempkin, Jovanovich, Redlich-Peterson, Sips, Toth and Radke-Prausnitz isotherms. The equilibrium data were best described by the Langmuir isotherm with a maximum adsorption capacity of 637.29 mg g(-1). Adsorption kinetic data were fitted using the pseudo-first-order and pseudo-second-order model. The adsorption kinetic is very fast and was best described by the pseudo-second-order model.


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