Cooperative adsorption of bisphenol-A and chromium(III) ions from water on activated carbons prepared from olive-mill waste |
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| Affiliation: | 1. Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain;2. Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. M. Nava No. 6, San Luis Potosí, SLP 78210, Mexico;1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli “Federico II”, Piazzale Tecchio 80, 80125, Napoli, Italy;2. Dipartimento di Ingegneria Civile, Design, Edilizia e Ambiente, Seconda Università di Napoli, Via Roma 29, 81031, Aversa (CE), Italy;1. Department of Chemistry, Faculty of Science, Hashemite University, P.O. Box 150459, Al-Zarqa 13115, Jordan;2. Faculty Research Centre for Built and Natural Environment, Faculty of Engineering and Computing, Coventry University, Coventry, UK;1. Department of Chemistry, Faculty of Science, The Hashemite University, P.O. Box 150459, Al-Zarqa 13115, Jordan;2. College of Sciences and Health professions, King Saud bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia;3. Faculty of Pharmacy, The Hashemite University, P.O. Box 150459, Al-Zarqa 13115, Jordan;1. Department of Chemistry, Faculty of Science, University Ibn Tofail,14000 Kenitra, Morocco;2. Chemical Engineering Department, University of Girona, Avda M. Aurelia Campany 61, 17003, Girona, Spain;1. Division of Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece;2. Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece |
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| Abstract: | The aim of this study was to investigate the simultaneous adsorption of bisphenol A (BPA) and chromium ions from aqueous solution on activated carbons (both commercial and prepared from olive-mill waste), analyzing both kinetic and equilibrium adsorption data. The effects of solution pH and ionic strength on the adsorption processes were also studied, as well as the chemical interactions between the carbon surface and the pollutants. The activated carbon prepared from olive-mill waste showed: a large surface area (up to 1641 m2 g−1), a highly heterogeneous micropore distribution, and a basic chemical nature. The pore volume diffusion model was used to predict the adsorption kinetics of both pollutants. The effective diffusion coefficients ranged between 1.15 × 10−6 and 9.18 × 10−7 cm2 s−1 for the BPA–Cr(III) system and between 1.65 × 10−6 and 2.8 × 10−6 cm2 s−1 for the Cr(III)–BPA system. The presence of both Cr(III) and BPA in the binary systems increases the adsorption effective diffusion coefficients and therefore the overall adsorption rate of each pollutant. The increased adsorption of each adsorbate when both pollutants are present is due to the in situ formation of complex compounds between Cr(III), acting as central metallic cation, and BPA, acting as ligand, during adsorption of both adsorbates on activated carbon. |
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