Studies on biosorption of cadmium on grape pomace using response surface methodology

In this study, a new biosorbent material, juice industry waste grape pomace was used as an adsorbent. Studies on the removal of cadmium from aqueous solutions using grape pomace were undertaken. The experiments were designed by full factorial design method (3–1 fractional factorial design). The fit of the model was checked by the determination coefficient (R2). In this case the value of the determination coefficient was 0.99916 indicates that only 0.00004% of the total variation was not explained by the model. The value of the adjusted determination coefficient 0.999 was also high significance of the model. The points giving the maximum removal efficiency of Cd(II) were found to be pH 5.2 and powdered grape pomace 12.5 g/L, temperature was 28.5°C, and the initial (aqueous) metal concentration was 43 mg/L.