| Abstrakt: |
Chicken egg shell powder (CESP) was exploited as a bio‐adsorbent to get rid of heavy metals such as Pb2+, Cd2+, and Cr3+from water. The BET surface area, surface image and elemental information, mineral type, and thermal changes of CESP were examined by BET surface analyzer, field emission scanning electron microscope/energy dispersive X‐ray spectrometer (FESEM/EDX), X‐ray diffractometer (XRD), and thermal gravimetric analysis (TG‐DTA), respectively. The batch adsorption experiments of heavy metals on CESP were investigated by varying initial heavy metal concentrations, contact time and CESP dosage. At initial heavy metal concentration of 50 mg/L tested, the adsorption rate of Pb2+was much faster than Cd2+and Cr3+and its removal efficiency showed more than 99% at 2.5 g of CESP dosage and 4 h of contact time. In the studied conditions, the adsorption capacity of CESP followed the order of Pb2+> Cr3+> Cd2+in system mixed with three heavy metals. The experimental data for adsorption kinetics and isotherm were evaluated by using pseudo‐first‐order and pseudo‐second‐order kinetic models and Freundlich and Langmuir isotherm models, respectively. The overall outcomes showed that the pseudo‐second‐order kinetics and the Langmuir isotherm models were applied well to the adsorption experimental data acquired in this study. Through this study, the CESP are thought to be an effective bio‐adsorbent material on heavy metals because of the low‐cost, the high adsorption capacity, the easy acquisition, and the absence of pretreatment for surface modification. Chicken egg shell. |
