Evaluación de la adsorción de cafeína utilizando cáscaras de naranja y plátano modificadas con magnetita para su remoción de aguas residuales sintéticas

Abstract

The adsorbent capacity of two agro-industrial residues and three synthesized magnetic materials (magnetite, banana peel + magnetite and orange peel + magnetite) was used in the removal of caffeine from synthetic wastewater. The synthesis of magnetite and the magnetic peels (composites) was carried out using the co-precipitation method. The caffeine removal was evaluated in batch tests using a synthetic wastewater of 30 mg/L. The use of magnetic peels improved between 1,1 to 1,3 times the caffeine removal respect to peels. The effective doses were 3,5 g/L of orange peel, 9,5 g/L of banana peel, 2,5 g/L of orange peel composite, 5,5 g/L of banana peel composite and 5 g/L magnetite achieving caffeine removal efficiencies of 95,5%, 90,5%, 93,6%, 89,2% and 54,8%, respectively.