Modeling of biosorption of Pb(II) and Zn(II) ions onto PaMRH: Langmuir, Freundlich, Temkin, Dubinin-Raduskevich, Jovanovic, Flory-Huggins, Fowler-Guggenheim and Kiselev comparative isotherm studies

Dada, Adewumi O. and Ojediran, J. O. and Okunola, Abiodun A. and DADA, F. E. and Lawal, A. I. and OLALEKAN, A. P. and Dada, O. (2019) Modeling of biosorption of Pb(II) and Zn(II) ions onto PaMRH: Langmuir, Freundlich, Temkin, Dubinin-Raduskevich, Jovanovic, Flory-Huggins, Fowler-Guggenheim and Kiselev comparative isotherm studies. International Journal of Mechanical Engineering and Technology (IJMET), 10 (2). pp. 1048-1058. ISSN ISSN Print: 0976-6340 and ISSN Online: 0976-6359

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Abstract

Biosorption of Pb2+ and Zn2+ onto Phosphoric Acid Modified Rice Husk (PAMRH) was carried out. The equilibrium adsorption data of Pb2+ and Zn2+ for initial concentration ranging from 10 – 200 mg g-1 were fitted into Langmuir, Freundlich, Temkin, Dubinin-Raduskevich, Jovanovic, Flory-Huggins, FowlerGuggenheim and Kiselev isotherm models. The comparative isotherm studies however, unraveled the adsorption capacities of PAMRH and a great affinity of the adsorbent (PAMRH) for Pb2+ than Zn2+. The studies showed that the adsorption Modeling of Biosorption of Pb(Ii) and Zn(Ii) Ions onto Pamrh: Langmuir, Freundlich, Temkin, Dubinin-Raduskevich, Jovanovic, Flory-Huggins, Fowler-Guggenheim and Kiselev Comparative Isotherm Studies http://www.iaeme.com/IJMET/index.asp 1049 editor@iaeme.com capacities obtained from isotherm models for Pb2+ are relatively higher than that of Zn2+. Comparatively, based on the correlation coefficients (R2) obtained from both Pb2+ and Zn2+ linear plots, the equilibrium data fitted to the isotherm models in the following order: Langmuir > Kiselev > DKR > Temkin > Freundlich > Jovanovic > Flory-Huggins > Fowler-Guggenheim. A maximum monolayer adsorption capacity of 138.89 mg g-1 was obtained from Langmuir adsorption isotherm for Pb2+ and 121.95 mgg-1 for Zn2+. Biosorption isotherm modeling shows that the uptake of these divalent heavy metals ions (Pb2+ than Zn2+) onto PAMRH took place at specific localized sites on the surface and the saturation coverage corresponds to complete occupancy of these sites. The mean adsorption free energy, E per molecule evaluated from DKR model was less than 8 kJmol-1 indicating a physisorption mechanism and electrostatic attraction. This study revealed vividly that PAMRH is a better and promising eco-friendly low cost adsorbent for both Pb2+ and Zn2+ Keywords: Biosorption, Isotherm modeling, Heavy metals, PAMRH.

Item Type:	Article
Subjects:	Q Science > Q Science (General)
Depositing User:	Mr DIGITAL CONTENT CREATOR LMU
Date Deposited:	26 Sep 2019 10:39
Last Modified:	26 Sep 2019 10:39
URI:	https://eprints.lmu.edu.ng/id/eprint/2420

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