Removal of Dissolved Hexavalent Chromium using Synthetic Biopolymer

The objective of this investigation was to study the biosorption of Cr (VI) on calcium alginate as synthetic biopolymer and to determine the isotherms and kinetics of chromium biosorption. Using a batch system, the capacity for Cr (VI) biosorption was investigated as a function of pH and shaking time. The optimal pH for Cr (VI) biosorption by calcium alginate was 4.0. Compared to the Langmuir isotherm model, the Freundlich model best fit the experimental data (R2>0.98). Moreover, the maximum biosorption capacity of Calcium alginate was 84.75 mg/g. The results of this study demonstrated that the pseudo-second order model was more suitable than pseudo-first order model for Cr (VI) biosorption onto calcium alginate.