title: Overall adsorption rate of metronidazole, dimetridazole and diatrizoate on activated carbons prepared from coffee residues and almond shells.
abstract: This study analyzed the overall adsorption rate of metronidazole, dimetridazole, and diatrizoate on activated carbons prepared from coffee residues and almond shells. It was also elucidated whether the overall adsorption rate was controlled by reaction on the adsorbent surface or by intraparticle diffusion. Experimental data of the pollutant concentration decay curves as a function of contact time were interpreted by kinetics (first- and second-order) and diffusion models, considering external mass transfer, surface and/or pore volume diffusion, and adsorption on an active site. The experimental data were better interpreted by a first-order than second-order kinetic model, and the first-order adsorption rate constant varied linearly with respect to the surface area and total pore volume of the adsorbents. According to the diffusion model, the overall adsorption rate is governed by intraparticle diffusion, and surface diffusion is the main mechanism controlling the intraparticle diffusion, representing >90% of total intraparticle diffusion.
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain.
authors.forename: J V
authors.initials: JV
authors.lastname: Flores-Cano
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain. Electronic address: mansanch@ugr.es.
authors.forename: M
authors.initials: M
authors.lastname: Sánchez-Polo
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Messoud
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Velo-Gala
authors.affiliation: Center of Postgraduate Research and Studies, Faculty of Chemical Sciences, San Luis Potosí Autonomous University, Av. Dr. M. Nava No. 6, San Luis Potosí SLP 78210, Mexico.
authors.forename: R
authors.initials: R
authors.lastname: Ocampo-Pérez
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Rivera-Utrilla
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry; D003069:Coffee; D003973:Diatrizoate / Q000032:analysis / Q000737:chemistry*; D004058:Diffusion; D004131:Dimetridazole / Q000737:chemistry*; D007700:Kinetics; D008795:Metronidazole / Q000032:analysis / Q000737:chemistry*; D000068181:Prunus dulcis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D003069:Coffee; D003973:Diatrizoate; D008795:Metronidazole; D002606:Charcoal; D004131:Dimetridazole
keywords: Activated carbon; Agro industrial residues; Overall adsorption rate; Pharmaceuticals contaminants; Surface diffusion