title: Adsorption of polar, nonpolar, and substituted aromatics to colloidal graphene oxide nanoparticles.
abstract: We conducted batch adsorption experiments to understand the adsorptive properties of colloidal graphene oxide nanoparticles (GONPs) for a range of environmentally relevant aromatics and substituted aromatics, including model nonpolar compounds (pyrene, phenanthrene, naphthalene, and 1,3-dichlorobenzene) and model polar compounds (1-naphthol, 1-naphthylamine, 2,4-dichlorophenol, and 2,4-dinitrotoluene). GONPs exhibited strong adsorption affinities for all the test compounds, with distribution coefficients on the order of 10(3)-10(6) L/kg. Adsorption to GONPs is much more linear than to carbon nanotubes (CNTs) and C60, likely because GO nanoflakes are essentially individually dispersed (rendering adsorption sites of similar adsorption energy) whereas CNT/C60 are prone to bundling/aggregation. For a given compound GONPs and CNTs often exhibit different adsorption affinities, which is attributable to the differences in both the morphology and surface chemistry between the two nanomaterials. Particularly, the high surface O-content of GONPs enables strong H-bonding and Lewis acid-base interactions with hydroxyl- and amino-substituted aromatics.
authors.affiliation: College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Wei Jin Road 94, Tianjin 300071, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.affiliation: Institute for Risk Assessment Sciences (IRAS), Utrecht University, Yalelaan 104, P.O. Box 80177, 3508 TD Utrecht, The Netherlands.
authors.forename: Joris J-H
authors.initials: JJ
authors.lastname: Haftka
authors.affiliation: Institute for Risk Assessment Sciences (IRAS), Utrecht University, Yalelaan 104, P.O. Box 80177, 3508 TD Utrecht, The Netherlands.
authors.forename: Theo L
authors.initials: TL
authors.lastname: Sinnige
authors.affiliation: Institute for Risk Assessment Sciences (IRAS), Utrecht University, Yalelaan 104, P.O. Box 80177, 3508 TD Utrecht, The Netherlands. Electronic address: j.hermens@uu.nl.
authors.forename: Joop L M
authors.initials: JL
authors.lastname: Hermens
authors.affiliation: College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Wei Jin Road 94, Tianjin 300071, China. Electronic address: chenwei@nankai.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D002722:Chlorobenzenes; D002733:Chlorophenols; D006108:Graphite / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*
chemical_list: D002722:Chlorobenzenes; D002733:Chlorophenols; D037742:Nanotubes, Carbon; D011084:Polycyclic Aromatic Hydrocarbons; C042146:1,3-dichlorobenzene; D006108:Graphite; C004762:2,4-dichlorophenol
keywords: Adsorption; Aromatics; Graphene oxide nanoparticles; Polar compounds