Biosorption of Cadmium Ions from Aqueous Solution by Using Padina AustralisBrown Algae

In this study, Padina Australis brown Alga was used for the removal of cadmium ions from aqueous solution and effect of important parameters such as solution pH, temperature, initial concentration of cadmium ions, contact time and adsorbent dosage on the biosorption process were studied. The maximum adsorption efficiency using this alga is obtained 97.39% in conditions pH, temperature, time, initial concentration of cadmium ions and adsorbent dosage of 6, 50 C, 80 min, 20 mg/L and 6 g/L, respectively. In this research, kinetic, equilibrium and thermodynamic studies were also investigated. The results showed that the pseudo second-order kinetic model was used for consideration of kinetic behaviors and the maximum adsorption capacity was obtained 7.424 mg/g by Langmuir method. Additionally, the adsorption process was as physical, desired, spontaneous and endothermic.