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Evaluation of Raw and Calcined Eggshell for Removal of Cd2+ from Aqueous Solution

대한화학회지 2020년 64권 5호 p.249 ~ 258
김영정, 유예림, 김민경, Choi Jong-Ha, 유건상,
소속 상세정보
김영정 ( Kim Young-Jung ) - Andong National University Center for Instrumental Analysis
유예림 ( Yoo Ye-Rim ) - Andong National University Department of Applied Chemistry
김민경 ( Kim Min-Gyeong ) - Andong National University Department of Applied Chemistry
 ( Choi Jong-Ha ) - Andong National University Department of Applied Chemistry
유건상 ( Ryoo Keon-Sang ) - Andong National University Department of Applied Chemistry

Abstract


The potential use of egg shell and calcined egg shell as adsorbent was evaluated and compared to remove Cd2+ 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 Cd2+ concentrations and adsorbent dosage. The results showed that, under the initial Cd2+ concentrations ranged from 25 to 200 mg g-1, the removal efficiencies of Cd2+ by egg shell powder (ESP) were decreased steadily from 96.72% to 22.89% with increase in the initial Cd2+ 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 Cd2+ concentration. The difference in the adsorption behavior of Cd2+ may be explained due to the different pH values of ESP and CESP in solution. Cd2+ 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 Cd2+ from aqueous solution is approximately 5.0 g and 1.0 g, respectively. Consequently, Cd2+ 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 Cd2+ by ESP was better fitted to Langmuir isotherm model. However, by contrast with ESP, CESP was described by Freundlich isotherm model well.

키워드

Egg shell; Calcined egg shell; Cd2+; Adsorbent; Adsorption

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