Carvão ativo de caroço de pêssego aplicado na adsorção do azul de metileno em solução aquosa: estudo de equilíbrio

Abstract

The textile industries use a range of synthetic dyes in their industrial processes to color their products. Nowadays, these industries are primarily responsible for the disposal of colored pollutants in water bodies. It is estimated that 20% to 30% of the dyes applied in products are not fixed, resulting in waste water with high dye concentrations of dye, pH and temperature. The residual water, containing dyes, is broadly toxic to animal and plant life, as even in small quantities it can cause inhibition of the light incidence and thus affecting the photosynthesis of aquatic plants, and also, reduction of the oxygen diffused in the water. The present work carried out the investigation of the use of peach kernel with precursor material for the production of low cost adsorbent for color removal of the methylene blue (MB) in aqueous solution. The characterization and the adsorption process were performed on several experimental conditions, such as particle size distribution of peach endocarp biomass, calcination at temperatures of 300°C and 450°C, pH and apparent density of the peach endocarp coal (PEC), , and then, the MB adsorption study at equilibrium. The results indicated that the PEC adsorbent calcinated at 450°C was the most efficient against the removal of color from the methylene blue solutions, obtaining the percentage of color removal 67.589 %. The Freundlich’s mathematical model was better fitted to the experimental data indication a heterogeneous and multilayer adsorption process.