title: Competitive adsorption of ibuprofen and amoxicillin mixtures from aqueous solution on activated carbons.
abstract: This work investigates the competitive adsorption under dynamic and equilibrium conditions of ibuprofen (IBU) and amoxicillin (AMX), two widely consumed pharmaceuticals, on nanoporous carbons of different characteristics. Batch adsorption experiments of pure components in water and their binary mixtures were carried out to measure both adsorption equilibrium and kinetics, and dynamic tests were performed to validate the simultaneous removal of the mixtures in breakthrough experiments. The equilibrium adsorption capacities evaluated from pure component solutions were higher than those measured in dynamic conditions, and were found to depend on the porous features of the adsorbent and the nature of the specific/dispersive interactions that are controlled by the solution pH, density of surface change on the carbon and ionization of the pollutant. A marked roll-up effect was observed for AMX retention on the hydrophobic carbons, not seen for the functionalized adsorbent likely due to the lower affinity of amoxicillin towards the carbon adsorbent. Dynamic adsorption of binary mixtures from wastewater of high salinity and alkalinity showed a slight increase in IBU uptake and a reduced adsorption of AMX, demonstrating the feasibility of the simultaneous removal of both compounds from complex water matrices.
authors.affiliation: Laboratory of Engineering Process and Industrial System (LR GPSI), National School of Engineers of Gabes (ENIG), University of Gabes (UG), Omar Ibn Elkhattab Street, 6029 Gabes, Tunisia; Group of Adsorption and Environmental Remediation on Porous Solids (ADPOR), Instituto Nacional del Carbón, INCAR-CSIC, Apdo. 73, 33080 Oviedo, Spain.
authors.forename: Hayet
authors.initials: H
authors.lastname: Mansouri
authors.affiliation: Group of Adsorption and Environmental Remediation on Porous Solids (ADPOR), Instituto Nacional del Carbón, INCAR-CSIC, Apdo. 73, 33080 Oviedo, Spain.
authors.forename: Rocio J
authors.initials: RJ
authors.lastname: Carmona
authors.affiliation: Group of Adsorption and Environmental Remediation on Porous Solids (ADPOR), Instituto Nacional del Carbón, INCAR-CSIC, Apdo. 73, 33080 Oviedo, Spain.
authors.forename: Alicia
authors.initials: A
authors.lastname: Gomis-Berenguer
authors.affiliation: Laboratory of Engineering Process and Industrial System (LR GPSI), National School of Engineers of Gabes (ENIG), University of Gabes (UG), Omar Ibn Elkhattab Street, 6029 Gabes, Tunisia.
authors.forename: Souad
authors.initials: S
authors.lastname: Souissi-Najar
authors.affiliation: Laboratory of Engineering Process and Industrial System (LR GPSI), National School of Engineers of Gabes (ENIG), University of Gabes (UG), Omar Ibn Elkhattab Street, 6029 Gabes, Tunisia.
authors.forename: Abdelmottaleb
authors.initials: A
authors.lastname: Ouederni
authors.affiliation: Group of Adsorption and Environmental Remediation on Porous Solids (ADPOR), Instituto Nacional del Carbón, INCAR-CSIC, Apdo. 73, 33080 Oviedo, Spain. Electronic address: conchi.ania@incar.csic.es.
authors.forename: Conchi O
authors.initials: CO
authors.lastname: Ania
mesh_terms: D000327:Adsorption; D000658:Amoxicillin / Q000302:isolation & purification*; D002244:Carbon / Q000737:chemistry*; D007052:Ibuprofen / Q000302:isolation & purification*; D049329:Nanostructures / Q000737:chemistry*; D016062:Porosity; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D000658:Amoxicillin; D002244:Carbon; D007052:Ibuprofen; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Binary mixtures; Competitive adsorption; Dynamic breakthrough experiments; Pharmaceuticals; Real wastewater