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Authors
Affiliations
1 Africa Centre of Excellence for Oil Field Chemicals Research, Institute of Petroleum Studies, University of Port Harcourt, Choba, Rivers State, Port Harcourt, NG
2 Department of Pure and Industrial Chemistry, University of Port Harcourt, Rivers State, NG
Source
International Journal of Innovative Research and Development, Vol 6, No 2 (2017), Pagination: 117-127
Abstract
Batch experiments were conducted for the removal of cadmium (II) ions from synthetic wastewater using succinic acid modified red onion skin extract (SROSE). Effects of pH, initial metal ion concentration and contact time were investigated. Maximum metal removal for cadmium was observed at pH 6.2, initial metal ion concentration of 20 mg/L, 28oC temperature and 50 min. contact time. The experimental data were analyzed based on Freundlich, Langmuir, Temkin and Flory-Huggins adsorption isotherms; and the results obtained from the correlation coefficients of the plots indicated that Freundlich adsorption isotherm gives the best fit for the experimental data. The thermodynamic parameters were calculated and the results obtained indicated that the sorption process was spontaneous and exothermic. The likely mechanism responsible for the Cd (II) ions removal was analyzed using the Dubinin-Radushkevich (DR) isotherm at different temperatures, and the results obtained showed that the major sorption mechanism was particle diffusion. Kinetic studies revealed that the adsorption of metal ions followed a pseudo-second order reaction.
Keywords
Cadmium (II) Metal Ions, Dubinin-Raduskevich Model, Freundlich Isotherm, Pseudo-Second Order, Red Onion Skin, Succinic Acid.
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