Sorption and Desorption Characteristics of Cobalt in Clay: Effect of Humic Acids

Kitae Baek; Ji-Won Yang

Korean Journal of Chemical Engineering, Vol.21, No.5, 989-993, September, 2004

DOI10.1007/BF02705582 Export Citation

Sorption and Desorption Characteristics of Cobalt in Clay: Effect of Humic Acids

Kitae Baek, and Ji-Won Yang^{1, †}

Department of Environmental Engineering, Kumoh National Institute of Technology (KIT), 188 Shinpyung-dong, Gumi, Gyeongbuk 730-701, Korea
¹Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea

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The effect of humic acid (HA) on the sorption and desorption of Co(II) on kaolin was investigated. Cobaltions interact with carboxylic and phenolic groups in HA and form HA-cobalt complex. The solubility of HA was affected by the surrounding pH. The presence of HA reduced the equilibrium time for the Co(II) sorption of Co(II) on kaolin in the presence of HA. In the knetic sorption and desorption of Co(II) on kaolin, the presence of HA shortened the breakthrough of Co(II) sorption on kaolin compared to bare kaolin, and HA solution enhanced the displacement of Co(II) from kaolin compared with deionized water.

Keywords:Clay;Cobalt;Desorption;Sorption;Humic Acid

[References]

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[2] Kim SH, Ngo HH, Chaudhary D, Kim JC, Vigneswaran S, Moon H, Korean J. Chem. Eng., 19(5), 888 (2002)

[3] Laszak I, Choppin GR, Radiochim. Acta, 89, 653 (2001)

[4] Milne CJ, Kinniburgh DG, De Wit JCM, Van Riemsdijk WH, Koopal LK, Geochem. Cosmochim. Ac., 59(6), 1101 (1995)

[5] Park CK, Hahn PS, Korean J. Chem. Eng., 16(6), 758 (1999)

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[7] Prado AGS, Airoldi C, Thermochim. Acta, 405(2), 287 (2003)

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[12] Wang XK, Dong WM, Wang G, Tao ZY, Appl. Radiat. Isot., 56, 765 (2002)