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Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite
Authors:Mariana Coutinho Brum  Jefferson Leixas Capitaneo  José Farias Oliveira
Affiliation:1. Department of Metallurgical and Materials Engineering, COPPE/UFRJ, Federal University of Rio de Janeiro, P.O. Box 68505, Rio de Janeiro – RJ, Brazil;2. Institute of Macromolecules, IMA/UFRJ, Federal University of Rio de Janeiro, P.O. Box 68525, Rio de Janeiro – RJ, Brazil;3. Center for Mineral Technology – CETEM, Rio de Janeiro – RJ, Brazil;1. Ausmelt Ltd, Australia;2. Helsinki University of Technology, Finland;1. Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey;2. Department of Environmental Health Engineering, School of Health, Arak University of Medical Sciences, Arak, Iran;3. Photochemical Nanosciences Laboratory, Department of Chemistry “G. Ciamician”, University of Bologna, Via Selmi 2, 40126 Bologna, Italy;4. Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran;1. K. Ramakrishnan college of technology,Tamilnadu, India;2. CHRIST (Deemed to be University), Bangalore, India;1. Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University, Nadiad 387 001, India;2. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan;3. Department of Chemical Engineering, Dharmsinh Desai University, Nadiad 387001, India
Abstract:The utilization of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent research studies. In the present work, the adsorption of hexavalent chromium onto montmorillonite modified by the cationic surfactant cetylpyridinium bromide (CPB) was studied by aiming at water pollution remediation. The electrophoretic mobility measurements of the organo-montmorillonite showed a zeta potential reversion from negative to positive in the whole acidic pH range and up to pH 8.5. In some cases the adsorption of chromate ions onto the organo-montmorillonite was higher than 98% and was well described by the Langmuir adsorption isotherm. The utilization of montmorillonite modified by CPB showed to be an attractive solution to the remediation of water contaminated with chromate ions.
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