Thermodynamic Study of the Competitive Adsorption of Chromium (III) Ions and Halides onto Sweet Orange (Citrus Sinensis) Peels as Adsorbent
- *Corresponding Author:
- Pam alosyius
Department of Chemistry
Federal University, Lokoja, Nigeria
E-mail: [email protected]
Received date: July 06, 2014; Accepted date: July 31, 2014; Published date: August, 02 ,2014
Citation: Pam AA, Audu UF, Onakpa SA, Muhammad AA (2014) Thermodynamic Study of the Competitive Adsorption of Chromium (III) Ions and Halides onto Sweet Orange (Citrus Sinensis) Peels as Adsorbent. J Environ Anal Chem 1:114. doi: 10.4172/2380-2391.1000114
Copyright: © 2014 Muhammad AA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The combined adsorption of Cr (III) ions and halides from aqueous solution using orange peels as adsorbent was modeled. Orange peels as adsorbent is resource-saving, and has environmental friendly behavior. The influence of initial pH, initial solution ion concentration, adsorbent dosage, halides and temperature on the adsorption efficiency was studied using batch equilibrium assays. Results showed that, adsorption of Cr (III) ions increases with decrease in initial pH (maximum at 2), increasing initial solution concentration, increasing peels dosage, absence of halides and decreasing temperature. Among the tested ï»¿isotherm ï»¿models, the Freundlich isotherm best modeled both adsorptions without and with presence of halides. Some thermodynamic parameters; ΔG, ΔH, A, ΔHr and ΔS were calculated from the experimental data, with the result showing that the adsorption process is feasible, spontaneous and follow physisorption mechanism. Thus, orange peel is effective in the sorption of chromium (III) ions from aqueous solution.