Removal of arsenic from aqueous solution by synthetic hematite
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Date
2011
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Chemical Society of Nigeria
Abstract
A sample of hematite has been prepared and characterized by determination of some physico-chemical parameters such as X- ray Diffraction analysis, specific gravity and point of zero charge measurement. The potential of synthesized hematite for the sorption of arsenic(III) aqueous solution was also investigated, and the sorption data were found to be fitted with Langmuir adsorption isotherm (type 2) as well as Freundlich and Temkin isotherms with corresponding correlation coefficient (R) of 0.96, 0.94 and 0.94 respectively. The adsorption capacity calculated from the Freundlich and Langmuir isotherms were 0.35 and 0.60 respectively. The sorption kinetics was also investigated and the equilibrium time determined to be 320mins. The kinetics was found to follow pseudo – first order kinetics. Desorption study was also carried out with concentrated HNO3 (1M), and was found to be effective for the stripping of 86% of pre – sorbed arsenic from the adsorbent after the first use