Abstract
Water decontamination from chromium (Cr) is of prime importance because of its carcinogenicnature. The sample of activated carbon was characterized by surface area analyzer, SEM/EDX,TGA, FTIR and PZC. This study was focused on adsorption of hexavalent chromium from theaqueous phase onto activated carbon. Both the temperature and pH had a positive effect on thechromate uptake by activated carbon. The chromate uptake at different pH values followed thetrend: pH 2> pH 3 >pH 4>pH 5 > pH 7 > pH 8. The sorption maxima at pH 2 was explained onthe basis of electrostatic attraction between the negatively charged chromate anions and positivelycharged surface of the activated carbon. Different models were tested to access the sorptionmaxima and to probe into the chromate adsorption mechanism. The thermodynamic parameterssuggested that heat is needed to shift the hexavalent chromium from solution to the solid surface.It was concluded that the anion exchange sorptionwas involved in removing the chromate anionfrom the aqueous system into the surface of activated carbon
Qamar Sultana, Abdul Naeem, Tahira Mahmood, NadirKhan, Asad Habib, Salah ud Din. (2018) Anion Exchange Sorption of Chromate from AqueousSolutions by Activated Carbon, Pakistan Journal of Analytical & Environmental Chemistry, Volume 19, Issue 2 .
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