Optimization of Cd (II) adsorption in polymer blends: analysis by factorial design

Abstract

The contamination by heavy metals occurs mainly by industrial effluents, having as important microcontaminant the cadmium, which can cause environmental and human health risks (renal and hepatic damages). Thus, the analysis of new adsorption systems is required, so that the present study aimed to evaluate the interaction of several factors, in factorial design in the adsorption of cadmium in aqueous solution by polymer PVA / amide / Hap polymer. Experimental variables were solution pH (2,0 <A <6,0), initial concentration of cadmium in solution (50 <B <150 mg / L), adsorbent mass (0,02 <C <0,06 g) and processing time (6 <D <24 h). The factorial design presented a coefficient of determination (R²) of 0,982 6. The combination of the pH (A) and the initial (B) factors present a better condition for removal of the cadmium at low initial concentration values relative to the increase in pH.