Characterization of agroindustrial residues and their application in the removal of methylene blue from aqueous solutions by adsorption.

The objective of the study is to evaluate the possibility of using agro-industrial waste sugar cane bagasse (BCA), sorghum agricultural waste (RAS) and mixtures of both, in proportions 60 BCA-40 RAS and 40 BCA-60 RAS, for the removal of contaminants present in aqueous solutions, methylene blue is selected as adsorbate be-cause it is used as a model dye for laboratory tests and is used mainly in the dyeing of cotton, wood, silk, paper, polyacrylonitrile, modified nylon, modified polyester and terephthalate. polyethylene; and to a certain extent, in health servicesFor this reason, physicochemical properties of these biosorbents were determined and batch adsorption experiments were carried out to determine the effect of particle size and residues on the removal of methylene blue in aqueous solution. Likewise, a full factorial design 32 was developed with independent variables pH and initial dye concentration to select the best parameters. The similarity in point of zero charge, acidic and basic sites, porosity, densities and elemental composition is evidenced, which is corroborated with the transfer of dye to the adsorbent materials, being achieved with the smallest range of particle size, (0.35-0 , 63) mm and with BCA the best removals. The design of experiments allowed to verify that both factors have a significant effect, that the best effectiveness in removal, 95.90%, is achieved with BCA at pH 2 and concentration of AM 100 mg / L, as well as the combinations of pH and concentrations more efficient.