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http://dx.doi.org/10.15681/KSWE.2019.35.2.123

Adsorption of Zinc Ion in Synthetic Wastewater by Ethylenediaminetetraacetic Acid-Modified Bentonite  

Jeong, Myung-Hwa (Department of Environmental Engineering, Kangwon National University)
Kwon, Dong-Hyun (Department of Environmental Engineering, Kangwon National University)
Lim, Yeon-Ju (Department of Environmental Engineering, Kangwon National University)
Ahn, Johng-Hwa (Department of Environmental Engineering, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.35, no.2, 2019 , pp. 123-130 More about this Journal
Abstract
Ethylenediaminetetraacetic acid-modified bentonite (EMB) was used for adsorption of zinc ion (Zn) from aqueous solution, compared with unmodified bentonite (UB). Parameters such as dose (0.750 ~ 3.125 g/L), mixing intensity (10 ~ 150 rpm), contact time (0.17 ~ 30 min), pH (2 ~ 7), and temperature (298 ~ 338 K), were studied. Zn removal efficiency for EMB was 20 ~ 30 % higher, than that for UB, in all experiments. Thermodynamic studies demonstrated that adsorption process was spontaneous with Gibb's free energy (${\Delta}G$) values, ranging between -5.211 and -7.175 kJ/mol for EMB, and -0.984 and -2.059 kJ/mol for UB, and endothermic with enthalpy (${\Delta}H$) value of 9.418 kJ/mol for EMB and 7.022 kJ/mol for UB. Adsorption kinetics was found to follow the pseudo-second order kinetics model, and its rate constant was 3.41 for EMB and $2.00g/mg{\cdot}min$ for UB. Adsorption equilibrium data for EMB were best represented by the Langmuir adsorption isotherm, and calculated maximum adsorption capacity was 2.768 mg/g. It was found that the best conditions for Zn removal of EMB within the range of operation used, were 3.125 g/L dose, 90 rpm intensity, 10 min contact time, pH 4, and 338 K. Therefore, EMB has good potential for adsorption of Zn.
Keywords
Adsorption; EDTA-modified bentonite; Operation condition; Zinc ion;
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