title: Adsorption of carbamazepine by carbon nanotubes: effects of DOM introduction and competition with phenanthrene and bisphenol A.
abstract: Carbon nanotubes, organic contaminants and dissolved organic matter (DOM) are co-introduced into the environment. Thus, the interactions between these components have to be evaluated to better understand their environmental behavior. In this study, single-walled carbon nanotubes (SWCNTs) were used as sorbent, carbamazepine was the primary adsorbate, and bisphenol A and phenanthrene were used as competitors. Strong competition with bisphenol A and no effect of phenanthrene on adsorption of carbamazepine was obtained. The hydrophobic neutral fraction of the DOM exhibited the strongest reductive effect on carbamazepine adsorption, most probably due to interactions in solution. In contrast, the hydrophobic acid fraction decreased carbamazepine adsorption mainly via direct competition. When DOM and bisphenol A were co-introduced, the adsorption of carbamazepine was significantly reduced. This study suggests that the chemical nature of DOM can significantly affect the sorptive behavior of polar organic pollutants with carbon nanotubes when all are introduced to the aquatic system.
authors.affiliation: Department of Soil and Water Sciences, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel.
authors.forename: Ilya
authors.initials: I
authors.lastname: Lerman
authors.forename: Yona
authors.initials: Y
authors.lastname: Chen
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
authors.forename: Benny
authors.initials: B
authors.lastname: Chefetz
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds / Q000032:analysis / Q000737:chemistry*; D002220:Carbamazepine / Q000737:chemistry; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000737:chemistry; D010616:Phenanthrenes / Q000032:analysis / Q000737:chemistry*; D010636:Phenols / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002220:Carbamazepine; D037742:Nanotubes, Carbon; D010616:Phenanthrenes; D010636:Phenols; D014874:Water Pollutants, Chemical; C031181:phenanthrene; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Adsorption; Binding; Carbamazepine; Dissolved organic carbon; Dissolved organic matter