Remoção do corante amarelo reativo B2R utilizando bagaço de cana-de-açúcar

Abstract

Dyeing steps in the textile industries have great importance in the processing of this tissue, however, large part of the dyes used to impart color to fabrics are discarded in subsequent washes, because that dyes do not settle 100% to textile fiber. Thus, the generated effluents present, in addition to other components, a dye in their composition. Conventional treatments applied not boil down just a step, but, many biological, physical and chemical methods. In the color removal by adsorption, activated carbon is widely used as adsorbent, however, it has a high cost and difficulty desorption of it. Thus, low-cost techniques in order to remove this coloration of waste water are studied. In this context, the present study was based in studying and defining the best conditions, equilibration time and amount of adsorbent required to remove the dye Reactive Yellow B2R in synthetic solution using sugarcane bagasse. Besides these parameters, the kinetic models: pseudo-first order kinetic models, pseudo-second order and intraparticle diffusion as in the Langmuir and Freundlich adsorption isotherm in the results obtained experimentally. The tests performed determined that at pH 1.5 the higher removal occurred, the time required to reach equilibrium was 36 hours, in this case the system was subjected to 30°C of temperature and agitation of 110 rpm. Moreover, form the kinetic models studied the best adjustment of the kinetic model was the pseudo-second order. Among the adsorption isotherms and, the Freundilich isotherm, was best represented the experimental data. The study demonstrated that the sugarcane bagasse shows potential in the treatment of effluents that contains the dye Reactive Yellow B2R.