Development of modified kaolins for the removal of As (III) in waters Online publication date: Wed, 23-Jun-2021
by Estefanía Baigorria; Leonardo Cano; Karim Sapag; Vera Alvarez
International Journal of Environment and Health (IJENVH), Vol. 10, No. 2, 2020
Abstract: Some inorganic species of arsenic (As) present in drinking waters are highly dangerous for human health. Adsorption technique is considered a promising technology for the selective removal of As from aqueous systems. Iron (Fe), and iron-containing clays are adsorbents commonly used for arsenic elimination from water due to the strong affinity between Fe and inorganic species of As. Natural and acid-treated kaolinites, impregnated with iron oxides (30 % and 20 % of the Fe (III)) were developed in the present work. The selected clays were physico-chemically characterised, and the As adsorption capability was tested in batch experiments at pH = 7. Arsenic removal studies showed 97% effectiveness for the 30% iron sedimented kaolinite at 1 h of treatment, being the most effective developed material. These preliminary results showed that the Fe (III) impregnated kaolinites could be considered as promising adsorbent materials for As removal from aqueous systems.
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