Gangwon, South Korea
Gangwon, South Korea

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Kim H.-U.,Sun Jin Environment | Kim K.-H.,Sun Jin Environment | Chang Y.-Y.,Kwangwoon University | Lee S.M.,Gangnung | Yang J.-K.,Kwangwoon University
Desalination and Water Treatment | Year: 2012

Diff erent recycled materials, which were derived from leather manufacturing processes, were used as adsorbents for the treatment of synthetic wastewater containing heavy metal ions. Three pelt scraps samples (P-M, P-Z and P-P), one shaving scrap (S) and one trimming scrap (T) were used as recycled adsorbents. Removal effi ciency of Cu(II), Cd(II), Zn(II), Pb(II) and Cr(III) was evaluated by a laboratory-scale batch reactor at diff erent solution pH. For all adsorbents except T sample, the adsorption of heavy metal ions begins between pH 2 and 4 and reaches near complete adsorption within the next 3-4 pH units, showing a typical cationictype of adsorption. Removal trend of Cr(III) was quite similar without depending on the kind of adsorbents. From the kinetic experiments of Cu(II) by S adsorbent, adsorption of Cu(II) was bett er described by second-order reaction than fi rst-order reaction. The initial removal rate of Cu(II) by S adsorbent was 7143 mg/kg·h. Adsorption isotherm of Cu(II) onto S adsorbent was well expressed by Langmuir equation and the maximum adsorption capacity of Cu(II) at pH 4 was calculated as 1667 mg/kg. © 2012 Desalination Publications. All rights reserved.

Kim K.-H.,Sun Jin Environment | Keller A.A.,University of California at Santa Barbara | Yang J.-K.,Kwangwoon University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2013

A novel composite material based on recycled activated alumina and recycled collagen fiber in an alginate gel was developed to address heavy metal contamination, targeting acid mine drainage. Alginate-alumina-collagen fiber (AACF) adsorbents were developed at different mixing ratios, and applied to treat synthetic and real mine drainage focusing on the removal of copper, cadmium and lead ions in batch and column reactors. In a bench-scale column test packed with AACF-33 the amount of Cd(II) removed was 32.2. mg/kg, although breakthrough of Cd(II) began after 314. h. For Cu(II) and Pb(II) breakthrough was not observed even after 1740. h. The amounts of Cu(II) and Pb(II) removed at this time were 1690. mg/kg and 414. mg/kg, respectively. A plausible explanation for this adsorption trend can be explained by the different hydration enthalpies of each metal ion. The hydration enthalpy of Cd(II) (-1807. kJ/mol) is appreciably greater in magnitude than that of Pb(II) (-1481. kJ/mol) which reflects a stronger interaction of Cd(II) with the coordinated water. The adsorption kinetics of AACF-33 for Pb(II), Cu(II) and Cd(II) was well described by a second-order rate expression. With its high capacity and high selectivity for Pb(II) and Cu(II), the AACF adsorbent has enormous potential for application in wastewater treatment technologies. © 2013 Elsevier B.V.

Yang J.K.,Kwangwoon University | Park Y.J.,Business Development Team | Kim K.H.,Sun Jin Environment | Lee H.Y.,Sun Jin Environment | And 2 more authors.
Water Science and Technology | Year: 2013

Among the various heavy metals, arsenic is frequently found in abandoned mine drainage and the environmental fate of arsenic in real aqueous solutions can be highly dependent on the presence of co-existing ions. In this study, removal of arsenate through adsorption on the reused aluminum oxide or through precipitation was investigated in a single and in a binary system as a function of pH and concentration. Different removal behaviors of arsenate were observed in the presence of different cations as well as a variation of the molar ratios of arsenate to cations. Co-operative effects on arsenate removal by precipitation in solution occurred with an increase of copper concentration, while a decrease of arsenate removal resulted in increasing calcium concentration. It was observed that the arsenate removal in the presence of calcium would be highly dependent on the molar ratios of both elements. © 2013 IWA Publishing.

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