title: Effect of nanoporous carbon surface chemistry on the removal of endocrine disruptors from water phase.
abstract: Wood-based activated carbon and its sulfur-doped counterpart were used as adsorbents of endocrine disruptor chemicals (EDC) from aqueous solution. Adsorption process was carried out in dynamic conditions and Thomas model was used to predict the performance of the column. The results showed a good fitting of the theoretical curve to the experimental data. S-doped carbon exhibited a higher adsorption capacity of trimethoprim (TMP) and smaller of sulfamethoxazole (SMX) and diclofenac (DCF) in comparison with the carbon with no sulfur incorporated into the matrix. The surface features of the initial carbons and those exposed to EDC were evaluated in order to derive the adsorption mechanism and elucidate the role of surface features. An increase in the amount of TMP from a low concentration solution (10 mg/L) on sulfur-doped carbon was linked to acid-base interactions and the reactive adsorption/oxidation of TMP. A decrease in SMX and DCF after sulfur doping was explained by a considerable increase in surface hydrophobicity, which does not favor the retention of polar DCF and SMX molecules. When the adsorption was measured from a high concentration solution at equilibrium conditions at the dark or under solar light irradiation different trends in the adsorption capacities were found. This was linked to the photoactivity of carbons and the degradation of EDC in the pore system promoted by visible light followed by the adsorption of the products of surface reactions.
authors.affiliation: Department of Chemistry, The City College of New York and the Graduate School of the City University of New York, 160 Convent Avenue, New York, NY 10031, USA; Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Rua do Contorno, S/N Campus do Pici, Bl. 713, CEP: 60451-970, Fortaleza, CE, Brazil.
authors.forename: Carla B
authors.initials: CB
authors.lastname: Vidal
authors.affiliation: Department of Chemistry, The City College of New York and the Graduate School of the City University of New York, 160 Convent Avenue, New York, NY 10031, USA.
authors.forename: Mykola
authors.initials: M
authors.lastname: Seredych
authors.affiliation: Department of Inorganic Chemistry, University of Malaga, Malaga, Spain.
authors.forename: Enrique
authors.initials: E
authors.lastname: Rodríguez-Castellón
authors.affiliation: Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Rua do Contorno, S/N Campus do Pici, Bl. 713, CEP: 60451-970, Fortaleza, CE, Brazil; Department of Analytical Chemistry and Physical Chemistry, Federal University of Ceará, Rua do Contorno, S/N Campus do Pici, Bl. 940, CEP: 60451-970, Fortaleza, CE, Brazil.
authors.forename: Ronaldo F
authors.initials: RF
authors.lastname: Nascimento
authors.affiliation: Department of Chemistry, The City College of New York and the Graduate School of the City University of New York, 160 Convent Avenue, New York, NY 10031, USA. Electronic address: tbandosz@ccny.cuny.edu.
authors.forename: Teresa J
authors.initials: TJ
authors.lastname: Bandosz
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D052244:Endocrine Disruptors / Q000302:isolation & purification*; D008027:Light; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D016062:Porosity; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D014877:Water Pollution, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D052244:Endocrine Disruptors; D014874:Water Pollutants, Chemical; D014867:Water; D002606:Charcoal; D013455:Sulfur
keywords: Activated carbon; EDC adsorption; Photoactivity; Porosity; Surface chemistry; Visible light