Removal of Pb (II) ion and Safranin Dye from Aqueous Solution by Sheep Wool

Document Type: Research Article

Authors

1 Chemistry Department, College of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

Abstract

The ability of wool sheep to remove Pb(II) ions and safranin dye from aqueous solutions through adsorption process was investigated at room temperature. The metal ions concentration was determined by flame atomic absorption spectrophotometer method. The safranin dye was determined by two beam UV-VIS spectrophotometer devise. The influence of pH, contact time, amount of adsorbent, temperature and initial metal ions concentration were examined by batch method. The experimental data were analyzed using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm equations. The correlation coefficients were determined by analyzing each isotherm. The results indicate that the experimental data show better correlation with the Freundlich isotherm for Pb(II) ion and Langmuir isotherm for safranin dye than other isotherms. Thermodynamic parameters such as Gibbs free energy enthalpy, and entropy have also been evaluated and it has been found that the sorption process was feasible, spontaneous and exothermic in nature. The maximum amounts of Pb(II) and safranin dye adsorbed (qm), that show in order of 12.787 (mg.g-1) for Pb(II) and 4.6533 (mg.g-1) for safranin of wool sheep. The morphological analysis of the wool sheep was performed by the scanning electron microscopy (SEM).

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