INVESTIGATION OF SORPTION OF CHROMATE ION ON A SYNTHETIC HEMATITE
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Date
2013
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Abstract
A Hematite sample was synthesized using precipitation method and it was characterized
using a combination of analytical techniques such as infrared spectroscopy, X-ray diffractometry and
atomic absorption spectrometry. The hematite was then studied for its potential to remove chromate ion
from aqueous solution. The maximum adsorption capacity was found to be 1.91 mg/g. The influence of
contact time, ionic strength and pH on the sorption capacity was also investigated. Maximum
adsorption was observed in the range pH 4.0 and pH 6.0 at an optimum time of 3 hours 20 mins. The
experimental results were finally analyzed using Langmuir, Freundlich and Temkin isotherms. The
Temkin isotherm was found to have the most satisfactory fitting for the sorption data. The sorption
kinetics was studied for the pseudo-first order and pseudo-second order models.