Isotherms Studies of Equilibrium Sorption of NI (II) Ion on Vignaunguiculata Husk

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Abstract

Equilibrium sorption of Nickel on Vigra:logolculata husk was studied using batch adsorption method. The applicability of Langmuir, Freundlich, Dubinin-lladushkevich, and Temkin equations was inves-tigated. Of the four adsorption isotherms, the 112 value of Temkin isotherm model was the highest and exhibited the best fit with the experimental data The maximum monolayer coverage KO from Langmuir isotherm model was determined to be 2000.00 mg/g, the separation factor indicating a favorable sorption experiment is 0.594. According to Freundlich isotherm model the sorption intensity (n) which is indication of favorable sorption is 0.692 with correlation coefficient 0.945. The heat of adsorption process was determined from Temkin isotherm model (1626.009 J/mole) and the mean free energy was estimated from Dubinin-Ftadushkevich isotherm model (8.5513 x 10.4 J/mol). Which indicate that ad-sorption experiment followed a physical process.

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