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IJESD 2017 Vol.8(6): 393-398 ISSN: 2010-0264
doi: 10.18178/ijesd.2017.8.6.984
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).
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).
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.
