Biosorption of an Anionic Dye, Eosin Yellow onto Pineapple Peels: Isotherm and Thermodynamic Study

Fabian Audu Ugbe; Patrick Onuh Anebi; Victoria Abiola Ikudayisi

doi:10.21467/ias.4.1.14-19

Authors

Fabian Audu Ugbe HQ 1 Division Nigerian Army, Kaduna, Nigeria
Patrick Onuh Anebi Department of Science Lab. Tech. Benue State Polytechnic, Ugbokolo, Nigeria
Victoria Abiola Ikudayisi Department of Chemistry, University of Ilorin, Ilorin, Nigeria

DOI:

https://doi.org/10.21467/ias.4.1.14-19

Abstract

Eosin Yellow (EY), an anionic dye (acid dye) was adsorbed using an agricultural waste, pineapple peels (PP) as bio-sorbent in order to investigate its suitability as an alternative adsorbent, and to give insight into the mechanisms of binding. The study includes: equilibrium isotherms and thermodynamics studies. The adsorption isotherm and thermodynamics experiments were conducted using batch equilibrium techniques. The adsorption data were fitted into Langmuir, Freundlich and Temkin isotherm models; as a result, the data fitted well into the Langmuir model from which the adsorption capacity, q_e was obtained as 11.76 mg/g. Experimental values of the thermodynamics parameters (ΔH, ΔS and ΔG) and separation factor (R_L) in combination suggested that the adsorption process was endothermic, feasible, spontaneous, and had high degree of freedom. Combined results of the isotherms and thermodynamic study suggested a physisorption-chemisorption mechanism for the adsorption process. Therefore, the results of the study could provide useful information to evaluate the raw pineapple peel powder as a cheap source of adsorbent for the removal of EY from waste water.

Keywords:

Eosin Yellow, Pineapple peels, Adsorption, Isotherms, Thermodynamics

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