Remoção do corante azul reativo 5G em coluna de leito fixo empacotada com adsorvente comercial Dowex Optipore SD-2

Abstract

In this work the adsorption process of the dye Reactive Blue 5G using commercial adsorbent Dowex Optipore SD-2 was evaluated. Experiments in a closed and batch system were carried out to evaluate the effect of solution pH (1 - 12), system temperature (30, 40 and 50 °C) and the particle diameter of the adsorbent (0.01 - 0.12 cm, 0.05 - 0.06 cm, 0.06 - 0.12 cm) in the adsorption process. In addition, experiments in fixed bed column using different average diameters of adsorbent particles (granulometric mixture, 0.055 e 0.090 cm), flow rate (2, 4 e 8 mL min-1) and feed concentration (25, 50 e 100 mg L-1) were carried out. The experimental breakthrough curves were described using mathematical models available in the literature. The experiments results in the closed and batch system showed that the adsorption process is more efficient solution pH equal to 2, the system temperature of 30 °C and using the adsorbent particles with a diameter between 0.01 to 0.12 cm. The experimental breakthrough showed that the bed formed by particles with a diameter between 0.01 and 0.12 cm, provided an adsorption process more efficient. Moreover, the effect of the flow rate and feed concentration on the breakthrough curves were significantly. A greater slope was observed with the increase of the flow rate and feed concentration, resulting in a greater useful height of column. In particular, in the flow rate of 8 mL min-1 a higher efficiency of the adsorption process was obtained. Among the mathematical models used to describe the adsorption process in fixed bed column, the best fit was obtained using the model that considers as limiting step of mass transfer the intraparticle diffusion.