EVALUATION OF DIRECT RED 80 DYE ADSORPTION BY CHITOSAN MICROSPHERES

Abstract

The damage caused to the environment by the textile industry, creates a demand for simple and inexpensive methods that remove waste water dyes. In this sense, this work had as objective to evaluate and optimize the adsorptive capacity of the chitosan microspheres, of the direct red azo dye 80. The materials were characterized by SEM and FTIR techniques. The results confirmed the adsorption phenomenon through bands and changes in the surface of the adsorbent, caused by the fixing of the dye. A Multivariate Planning with Response Surface was performed, finding a saddle point, evidencing that the optimal point of the parameters is in another experimental domain. The adsorption was studied through isotherms, presenting a better regression adjustment (r> 0.98) for the Freundlich model. The results showed effectiveness of color removal (97% in 24h) and operational ease with the adsorbent.