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

A.O., Dada 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). 048-1058.

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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, Fowler- Guggenheim 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 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+

Item Type:	Article
Subjects:	Q Science > QD Chemistry
Depositing User:	Dr Adewumi Oluwasogo DADA
Date Deposited:	17 Jan 2024 11:15
Last Modified:	17 Jan 2024 11:15
URI:	https://eprints.lmu.edu.ng/id/eprint/5351

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