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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 11, No. 7, 2014, pp. 1835-1844
Bioline Code: st14179
Full paper language: English
Document type: Editorial
Document available free of charge

International Journal of Environment Science and Technology, Vol. 11, No. 7, 2014, pp. 1835-1844

 en Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala check for this species in other resources -L
Ghasemi, M.; Ghasemi, N.; Zahedi, G.; Alwi, S.R.W.; Goodarzi, M. & Javadian, H.

Abstract

In this study, the adsorption behavior of Ni(II) in an aqueous solution systemusing natural adsorbent Peganum harmala check for this species in other resources -L was measured via batch mode. The prepared sorbent was characterized by scanning electron microscope, Fourier transform infrared spectroscopy, N2 adsorption– desorption and pHzpc. Adsorption experiments were carried out by varying several conditions such as contact time, metal ion concentration and pH to assess kinetic and equilibrium parameters. The equilibrium data were analyzed based on the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms. Kinetic data were analyzed using the pseudo-firstorder, pseudo-second-order and intra-particular diffusion models. Experimental data showed that at contact time 60 min, metal ion concentration 50 mg/L and pH 6, a maximumamount ofNi(II) ions can be removed. The experimental datawere best described by the Langmuir isothermmodel as is evident from the high R2 value of 0.988. The adsorption capacity (qm) obtained was 68.02 mg/g at an initial pH of 6 and a temperature of 25 °C. Kinetic studies of the adsorption showed that equilibriumwas reachedwithin 60 min of contact and the adsorption process followed the pseudo-first-order model. The obtained results show that P. harmala-L can be used as an effective and a natural low-cost adsorbent for the removal of Ni(II) from aqueous solutions.

Keywords
Adsorption; Isotherm; Kinetic; Natural adsorbent; Ni(II); Peganum harmala-L

 
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