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The potential use of egg shell and calcined egg shell as adsorbent was evaluated and compared to remove Cd<SUP>2+</SUP> from aqueous solution. The samples were characterized using Thermogravimetry and Differential Thermal Analysis (TG/DTA), Scanning Electron Microscope (SEM), X-ray Diffractometer (XRD), Energy Dispersive X-ray Spectrometer (EDX) and BET Surface Analyzer. The batch-type adsorption experiment was conducted by varying diverse variables such as contact time, pH, initial Cd<SUP>2+</SUP> concentrations and adsorbent dosage. The results showed that, under the initial Cd<SUP>2+</SUP> concentrations ranged from 25 to 200 ㎎ g<SUP>-1</SUP>, the removal efficiencies of Cd<SUP>2+</SUP> by egg shell powder (ESP) were decreased steadily from 96.72% to 22.89% with increase in the initial Cd<SUP>2+</SUP> concentration at 2.5 g of dosage and 8 h of contact time. However, on the contrary to this, calcined egg shell powder (CESP) showed removal efficiencies above 99% regardless of initial Cd<SUP>2+</SUP> concentration. The difference in the adsorption behavior of Cd<SUP>2+</SUP> may be explained due to the different pH values of ESP and CESP in solution. Cd<SUP>2+</SUP> seems to be efficiently removed from aqueous solution by using the CESP with a basicity nature of around pH 12. It was also observed that an optimum dosage of ESP and CESP for nearly complete removal of Cd<SUP>2+</SUP> from aqueous solution is approximately 5.0 g and 1.0 g, respectively. Consequently, Cd<SUP>2+</SUP> is more favorably adsorbed on CESP than ESP in the studied conditions. Adsorption data were applied by the pseudo-first-order and pseudo-second-order kinetics models and Freundlich and Langmuir isotherm models, respectively. With regard to adsorption kinetics tests, the pseudo-second-order kinetics was more suitable for ESP and CESP. The adsorption pattern of Cd<SUP>2+</SUP> by ESP was better fitted to Langmuir isotherm model. However, by contrast with ESP, CESP was described by Freundlich isotherm model well.
목차
ABSTRACT
INTRODUCTION
MATERIALS AND METHOD
RESULTS AND DISCUSSION
CONCLUSION
REFERENCES
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