Utiliza??o de serragem e baga?o de cana-de-a?úcar para adsor??o de cádmio

摘要

Metals which come from anthropogenic activities contaminate the atmosphere, inputs and raw materials and, consequently, the trophic chain, thus affecting humankind. Due to the accumulation of these metals, as well as their harmful consequences, studies are being carried out to evaluate the levels reached by such contaminations. The objective of this work was to test the capacity of the sawdust and pulp from cane, in adsorber heavy metals from model solutions of chloride of cadmium, at the concentrations of 25 and 50 mg.L-1. The triplicates of samples taken for analysis were dried in the air in an airy atmosphere, without any processes, and the experiments were done with 10 g of residue and 500 mL of solution of chloride of cadmium in PVC reactors with a capacity of 1300 mL, where the homogeinization was made manually during the contact of 16 hours25. As the capacity of adsorption of the metal for the residue was not drained at first, the possibility of a new contact reusing the remaining solution was studied, maintaining the proportion at 1:5025. In a second stage they were tested at times of 12, 8 and 4 hours. The amount of cadmium was determined by the atomic absorption spectrofotometry (AAS) in the contact solution, after separating the residue for filtration. According to the results, we can say that these residues can be used as adsorbents of heavy metals in effluent treatment.