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Environmental Engineering Research 2002;7(1): 49-57. DOI: https://doi.org/10.4491/eer.2002.7.1.049
Moon-Sun Kim, and Jaygwan G. Chung
Department of Chemical Engineering, Sungkyunkwan University, Kyonggi-Do 440-746, Korea
Corresponding Author: Jaygwan G. Chung ,Tel: +82-31-290-7241, Fax: +82-31-290-7272, Email: jgchung@yurim.skku.ac.kr
Received: November 14, 2001;  Accepted: March 5, 2002.
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This study concerns the removal of copper ion (Cu2+), which is a highly toxic element, from wastewater by using kaolin in a adsorption process. Experiments were performed at kaolin concentration of 50 g-L'1 in a static system with a batch type. The adsorptivity increased rapidly with an increasing pH value from pH 3 to pH 5 and more slowly with an increasing pH value from pH 5 to pH 8. The pH value of the solutions decreased from pH 5.5 to pH 4.2 with time owing to the ion-exchange mechanism between the hydrogen ion and the Cu2' ion. The isoelectric point of solutions containing 50 g-L"1 kaolin was 4.3 at 28 °C. The adsorptivity increased with an increasing pH value, whereas the zeta potential decreased. Adsorption rate constants at pH 4 and 7 at 28 °C were 5.43 xlO"2 and 4.63 x 102 min"1, respectively. The adsorption of Cu2+ on kaolin did not make CO2 of a by-product.
Keywords: adsorption | copper ion | kaolin | pH dependence
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