A STUDY OF THE DYNAMICS OF COPPER (II) IONS UPTAKE FROM AQUEOUS SOLUTIONS BY HUMAN HAIR USING CONDUCTIVITY AND PH MEASUREMENTS

Mosotho Joseph George, Nthako Ramollo

Abstract


As the search for renewable resources for removal of pollutants from the environment grows, the use of biological sorbents has received a great deal of attention. Biological sorbents such as human hair have been explored due to their ready availability, renewability and effectiveness. This manuscript reports a study of the dynamics of copper (II) ions uptake by human hair using conductivity and pH measurements. The adsorption of these ions demonstrated a logarithmic behaviour, resembling first order kinetics, although the analysis showed a deviation from the first order kinetics. The maximum uptake of 288 µg g-1 was reached after about 120 minutes of static equilibration using a solution of 100 ppm. Interestingly the adsorption seems to be intermediate between a simple chemisorption and ion exchange as evidenced by a deviation from the linearity when conductivity was plotted against the pH measurements. However there was a significant correlation (R2 = 0.9926) between conductivity and pH in the case of a classical ion exchange resin – Amberlite CG 50. 


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DOI: http://dx.doi.org/10.17628/ecb.2014.3.883-887

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