Characterization of Aromatic Compound Sorptive Interactions with Black Carbon(Charcoal)Assisted by Graphite as a Model

摘要

Molecular interactions controlling the sorption of pollutants to environmental black carbons(soot,charcoal)are not well-resolved.Sorption of a series of aromatic compounds was studied to wood charcoal and nonporous graphite powder as a model adsorbent.Issues of concern were the possible involvement of pi-pi electron donor-acceptor(EDA)interactions of electron-poor and electron-rich solutes with the graphene(polycyclic aromatic)surface and size exclusion effects.Sorption of pi-acceptors,benzonitrile(BIMTL),4-nitrotoluene(MNT),2,4-dinitrotoluene(DNT),and 2,4,6-trinitrotoluene(TNT),and to a lesser extent pi-donor solutes,naphthalene(NAPH)and phenanthrene(PHEN),was greater than predicted by hydrophobic driving forces in accord with their accentor or donor strenath.