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    • ISSN: 2010-0264
    • Frequency: Bimonthly (2010-2014); Monthly (Since 2015)
    • DOI: 10.18178/IJESD
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Editor-in-chief
The University of Queensland, Australia
It is my honor to be the editor-in-chief of IJESD. The journal publishes good papers in the field of environmental science and development.
IJESD 2017 Vol.8(6): 393-398 ISSN: 2010-0264
doi: 10.18178/ijesd.2017.8.6.984

Adsorption Characteristics of Leonardite for Removal of Cd(II) and Zn(II) from Aqueous Solutions

Apiradee Terdputtakun, Orn-Anong Arqueropanyo, Sorapong Janhom, Ponlayuth Sooksamiti, and Wimol Naksata
Abstract—Leonardite was used as an adsorbent for the removal of Cd(II) and Zn(II) from aqueous solutions. The characteristics of leonardite were determined using XRD, XRF, FTIR, and SEM. Adsorption of Cd(II) and Zn(II) on leonardite, in batch system at 30 °C, was investigated to achieve the optimum condition for metals removal. Studies were carried out at different pH, contact time, and initial metal concentration. It was found that adsorption of metals ions was strongly influenced by pH value. The optimum adsorption conditions obtained were pH 6 and contact time of 60 min. Adsorption data were interpreted to kinetic models, including pseudo-first-order, pseudo-second-order, intra-particle diffusion, and adsorption isotherm models, including Langmuir isotherm and Freundlich isotherm. Pseudo-second-order kinetic model was suitable for describing adsorption of Cd(II) and Zn(II) on leonardite. Both Langmuir and Freundlich isotherms fitted well with the adsorption data of Zn(II) whereas the adsorption of Cd(II) better fitted to Freundlich isotherm.

Index Terms—Leonardite, adsorption, kinetic, isotherm.

Apiradee Terdputtakun, Sorapong Janhom, and Wimol Naksata are with the Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand (e-mail: Apiradee_terd@hotmail.com, sorapongj@gmail.com, scchi021@chiangmai.ac.th).
Orn-anong Aqueropanyo is with the Department of Chemistry, and Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand (e-mail: orn.arquero@gmail.com).
Ponlayuth Sooksamiti is with the Department of Primary Industry and Mine Office Region 3, Chiang Mai, Thailand (e-mail: sooksamiti@hotmail.com).

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Cite: Apiradee Terdputtakun, Orn-Anong Arqueropanyo, Sorapong Janhom, Ponlayuth Sooksamiti, and Wimol Naksata, "Adsorption Characteristics of Leonardite for Removal of Cd(II) and Zn(II) from Aqueous Solutions," International Journal of Environmental Science and Development vol. 8, no. 6, pp. 393-398, 2017.

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