Thermodynamic study of the adsorption of an azoic dye by a lignocellulosic residue in an aqueous medium

Roasted and ground coffee residue was investigated as an adsorbent lignocellulosic material capable of removing methyl orange dye from aqueous solutions by means batch adsorption experiments. The effects experimental parameters on the behavior, such initial concentration, dosage, pH temperature were studied. A better observed at acid pH, low with dosage 6 g/L. Pseudo-second order kinetics found according to Lagergren kinetic model. maximum capacity 1.3 mg per gram calculated fitting Langmuir analyzed be exothermic in nature. roasted viable for primary treatment wastewater contaminated azoic-type compounds.