Removal of Methylene Blue from Aqueous Solutions by Using Nance (Byrsonima crassifolia) Seeds and Peels as Natural Biosorbents

Contamination of effluents with chemicals is a serious problem that impacts human health. Methylene blue cationic dye found frequently in industrial and urban sewages. In this work, dried grinded seeds peels nance were used as biosorbents aqueous solutions at pH 7 10 (simulating textile effluents) finding Langmuir Freundlich isotherms adequately described the sorption. Adsorption efficiencies larger than 98% all cases slightly lower due to closeness point zero charge (pzc) (5.96 3.42, respectively). cases, adsorption was favorable (RLa < 1), Gibbs free energy negative indicating spontaneity, since these values ?80 but 0 kJ/mol, MB removal process mainly physical interactions, characteristic adsorption. No significant differences amongst bulk mass transfer coefficients for both sorbents, bioadsorbents had same hydrodynamic driving forces well depicted similar MB-adsorbent affinities. Interaction adsorbents corroborated by FTIR spectroscopy, sorption evidenced scanning electron microscopy image analysis which indicated fractal structures.