Remoção de corante reativo usando carvão ativado de ossos bovinos magnético

Abstract

This work aimed to study the removal of reactive black 5 textile dye using bonechar in its original form (BC) and magnetically modified (FeBC). Initially, the pHPCZ of the materials was determined. In the adsorption experiments, the influence of pH, dosage, adsorption time and the maximum adsorptive capacity were evaluated by means of an isotherm, both conducted at a temperature of 40 °C. The experimental kinetic and equilibrium data were analyzed using models available in the literature. The pHPCZ was determined to be 8.31 and 7.74 for BC and FeBC, respectively. In the adsorbent dosage tests, it was verified that there was a lower removal of the dye by the FeBC adsorbent compared to BC, indicating that the impregnation with magnetite influenced the adsorption characteristics. Dye removal remained constant when dye solutions with an initial pH between 3 and 10 were used. The kinetic data for the two materials fit both models, but with better adaptation to the pseudo-second order. The maximum amounts (qmax) obtained were 91.28 mg g-1 and 82.19 mg g-1 for BC and FeBC samples, respectively. Although there is a reduction in the adsorption capacity, impregnation with magnetic particles makes FeBC more versatile for application in the adsorption process, since its removal from the solution is facilitated with the use of magnets.