Produção e caracterização de compósitos a partir da reutilização sustentável dos resíduos de construção civil e de conchas de Mytella charruana visando a remoção do corante azul de metileno

Abstract

In recent decades, the world has faced critical problems with water supply and the generation of waste resulting from the increase in its population. The recovery and reuse of waste for the development of materials supplied for water treatment is an area that has received a lot of attention. Therefore, this work proposed to evaluate the use of construction waste (RCD) and Mytella Charruana (MC) shells as an adsorbent in the removal of methylene blue (AM) dye present in aqueous solutions. The precursor materials and the resulting mixture were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The adsorbent dosage, solution pH, particle size and RCD:MC mass ratio were evaluated. The smaller particle size (dp < 0.29 mm) and 3:1 RCD-MC ratio showed greater adsorption capacity, being used for the adsorptive study. The adsorption tests revealed a better kinetic fit for the Elovich model, while the Redlich–Peterson model showed a better fit to the experimental isothermal equilibrium data decreasing adsorption in multilayers. The maximum adsorption capacity was 14.83 mg/g (60 ºC). The results highlighted the potential for using the RCD-MC compound as an adsorbent material.