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Uptake of Reactive Black 5 by pumice and walnut activated carbon: Chemistry and adsorption mechanisms
Affiliation:1. Department of Chemistry, Indian Institute of Technology, Roorkee -247667, India;2. Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa;3. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran;4. Institute for Environmental Research, Center for Solid Waste Research, Tehran, Iran;5. Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Davutpasa Campus, 34220, Esenler, Istanbul, Turkey;6. Universite de Rennes 1, Ecole Nationale Superieure de Chimie de Rennes, CNRS, UMR6226, Avenue du General Leclerc, CS 50837, 35708 Rennes, Cedex 7, France;7. Health Sciences Research Centre, Mazandaran University of Medical Sciences, Sari, Iran;8. CEIT, Unit of Environmental Engineering, Paseo Manuel de Lardizabal 15, 20018 San Sebastian, Spain;9. IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Spain
Abstract:The potential of using pumice and walnut wood activated carbon as low-cost adsorbents for the removal of the diazo dye Reactive Black 5 (RB5) from aqueous solutions was investigated. The Langmuir isotherm fit to the data specified the presence of two different natures of adsorption sites with different binding energies on the AC-W surface. Kinetic modelling showed that the adsorption behaviour and mechanism of RB5 for both adsorbents is believed to happen via surface adsorption followed by diffusion into the pores of the AC-W and pumice. The main adsorption mechanisms are hydrogen bonding, electrostatic bonding and n–π interactions.
Keywords:Azo dyes  Pumice and walnut wood activated carbon  Isotherm and kinetic models  Adsorption mechanisms
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