Remoção dos corantes azul de metileno e cristal violeta de Solução aquosa utilizando Epicarpo (casca) de uva Niágara rosada (Vitis labrusca) como adsorvente

Abstract

In this study, Niagara grape skin Pink in nature (Vitis Labrusca), herein called CUNRin, was prepared and characterized and then used as an alternative adsorbent for the removal of the cationic dye, methylene blue (MB) and crystal violet (CV) from aquous solution. The adsorption experiments were performed by batch process temperature of 25.0 ± 1.0 °C. Important parameters that influence the adsorption capacity as initial pH, adsorbent mass, contact time and initial concentration of dye were investigated in this work. The maximum adsorption capacity for (AM) and (CV) was obtained at alkaline pH between (8.0 - 10.0). The amount of adsorbent required for efficient removal of dyes (AM) and (CV) was 400.0 mg. The minimum time to set up the equilibrium condition for (AM) was 30.0 minutes, while for the (CV) was 60.0 minutes. The kinetics of adsorption of dyes in CUNRin were investigated using non - linear kinetic models of Pseudo - first order, Pseudo -second order and Elovich. The Pseudo - second order model is what best describes the adsorption kinetics for both dyes studied with R2 values close to unity and downs of values χ2. Balance studies between adsorbent - adsorvate were performed through nonlinear mathematical models of Langmuir, Freundlich and Sips. Among equilibrium models studied the Sips model it is the most suitable to describe the adsorption of the dye molecules and the adsorbent. Based on the model Sips maximum adsorption capacity obtained were 110.80 mg g–1 ± 3.92 mg g-1 to (AM) and 93.80 mg g–1 ± 3.71 mg g-1 to (VC). The viability was investigated CUNRin synthetic textile effluent. The results obtained show that the CUNRin can be used as an alternative adsorbent for the removal of the adsorbents (AM) and (CV) of aqueous effluents.