부산대학교 도서관

Present study focused on abundantwaste of Aloe. barbadense miller leaves treated with sodium bicarbonate(MABL)for the removal of Cd (II) from aqueous solution and industrial effluent using fixed bed continuous process.The experimentation data obtainedfrom breakthrough curves for different conditions (flow rate = 10––30 mL/min, Cd (II) concentration from 20 to 60 mg/L, Different bed height (Bio-adsorbent doses = 10–30 g).Uptake capacity ofCd(II) increased with increased bed depth but remained constant at any flow rate.The optimum conditions obtained were a flow rate 10 mL/min, bed height of 10 cm, and initial concentration of 20 mg/L at the maximum total adsorption capacity is 54.05 mg/g and removal efficiency is 56.3 %. Characterization of the scanning electron microscopy analysis–energy dispersive X-ray spectroscopy (SEM-EDX) analysis confirms the adsorption of Cd (II) in the bio-adsorbent surface. Column behaviors was predicted by mathematical model with desirable accuracy. Thomas model was the best Kinetics model in the biosorption process on the Cd(II) with good correlation coefficient of the experimental data in comparison of Yoon Nelson model,Bohart- Adam model (R2 > 0.90).The efficiency of bio-adsorbent regeneration achieved by 0.1 M HCl was very high, that was 50–33 % for Cd (II)during first to third reused cycle. MABL is also used to removal of Cd (II) by applying a semi-simulated real wastewater in fixed bed column So that it can be concluded that MABL is a good bio-adsorbent for treating wastewater having low concentrations of Cd (II) contamination.