Houda Zaidi.; Abdelkader Khiari.; Noureddine Gherraf; Djemoi Merzoug.; Dounia Dib.; Hinda Hafid.; Noureddine Meza.; Lamia Bouhafs. and Souad Bekhouche.
Cr (VI) is a known human carcinogen. The Reduction of Cr(VI) to Cr(III) is environmentally favorable as the latter species is not toxic to most living organisms and also has a low mobility and bioavailability. Limonite (FeO(OH).nH2O) may contribute to redox transformations of a range of pollutants including Cr(VI). Main mechanism of Cr(VI) removal is its reduction into Cr(III) by the Fe(II) under acidic condition. The aim of the present work was to use limonite particles for reduction remediation of Cr (VI) in the water. The results of groping experiments revealed that the removal efficiency increased with increasing ironstone addition, but decreased with increasing initial Cr (VI) concentration. Moreover, low pH value could accelerate the rate of Cr (VI) removal. The smaller are the ironstone particles, the higher is the surface area, and the faster the reaction rate will be. The study showed clearly that the use of limonite (FeO(OH).nH2O) for the removal of Cr(VI) through reduction reaction can be applicable to Cr(VI) contaminated solutions.
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