Langmuir, Freundlich, Temkin and Dubinin–Radushkevich Isotherms Studies of Equilibrium Sorption of Zn 2+ Unto Phosphoric Acid Modified Rice Husk

A.O, Dada and A.P, Lekan and A.M., Olatunya and O., Dada (2012) Langmuir, Freundlich, Temkin and Dubinin–Radushkevich Isotherms Studies of Equilibrium Sorption of Zn 2+ Unto Phosphoric Acid Modified Rice Husk. IOSR Journal of Applied Chemistry, 3 (1). pp. 38-45. ISSN 22785736

Text J0313845 (2024 download).pdf Download (267kB)

Abstract

Equlibrium sorption of the phosphoric acid modified rice husk was studied. The Physico-chemical properties of the modified rice husk were determined. The equilibrium sorption data were fitted into Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (DRK) isotherms. Of the four adsorption isotherm, the R2 value of Langmuir isotherm model was the highest. The maximum monolayer coverage (Qo) from Langmuir isotherm model was determined to be 101.01mg/g, the separation factor indicating a favourable sorption experiment is 0.133. Also from Freundlich Isotherm model, the sorption intensity (n) which indicates favourable sorption and the correlation value are 1.6 and 0,89 respectively. The heat of sorption process was estimated from Temkin Isotherm model to be 25.34J/mol and the mean free energy was estimated from DRK isotherm model to be 0.7KJ/mol which vividly proved that the adsorption experiment followed a physical process. Keywords: Heavy metals, Isotherms, Rice husk and Sorption.

Item Type:	Article
Subjects:	Q Science > QD Chemistry
Depositing User:	Dr Adewumi Oluwasogo DADA
Date Deposited:	17 Jan 2024 11:13
Last Modified:	17 Jan 2024 11:13
URI:	https://eprints.lmu.edu.ng/id/eprint/5341

Actions (login required)

View Item