title: Adsorption of halogenated aliphatic contaminants by graphene nanomaterials.
abstract: In this study, adsorption of ten environmentally halogenated aliphatic synthetic organic compounds (SOCs) by a pristine graphene nanosheet (GNS) and a reduced graphene oxide (rGO) was examined, and their adsorption behaviors were compared with those of a single-walled carbon nanotube (SWCNT) and a granular activated carbon (GAC). In addition, the impacts of background water components (i.e., natural organic matter (NOM), ionic strength (IS) and pH) on the SOC adsorption behavior were investigated. The results indicated HD3000 and SWCNT with higher microporous volumes exhibited higher adsorption capacities for the selected aliphatic SOCs than graphenes, demonstrating microporosity of carbonaceous adsorbents played an important role in the adsorption. Analysis of adsorption isotherms demonstrated that hydrophobic interactions were the dominant contributor to the adsorption of aliphatic SOCs by graphenes. However, π-π electron donor-acceptor and van der Waals interactions are likely the additional mechanisms contributing to the adsorption of aliphatic SOCs on graphenes. Among the three background solution components examined, NOM showed the most influential effect on adsorption of the selected aliphatic SOCs, while pH and ionic strength had a negligible effects. The NOM competition on aliphatic adsorption was less pronounced on graphenes than SWCNT. Overall, in terms of adsorption capacities, graphenes tested in this study did not exhibit a major advantage over SWCNT and GAC for the adsorption of aliphatic SOCs.
authors.affiliation: Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, United States.
authors.forename: Onur Guven
authors.initials: OG
authors.lastname: Apul
authors.affiliation: Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, United States. Electronic address: tkaranf@clemson.edu.
authors.forename: Tanju
authors.initials: T
authors.lastname: Karanfil
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000737:chemistry*; D006846:Hydrocarbons, Halogenated / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D049329:Nanostructures; D037742:Nanotubes, Carbon; D009994:Osmolar Concentration; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006842:Hydrocarbons, Brominated; D006846:Hydrocarbons, Halogenated; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D002606:Charcoal; D006108:Graphite
keywords: Activated carbons; Adsorption; Aliphatic synthetic organic compounds; Carbon nanotubes; Graphenes; Natural organic matter