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Effects of sulfide reduction on adsorption affinities of colloidal graphene oxide nanoparticles for phenanthrene and 1-naphthol.

Environmental pollution (Barking, Essex : 1987) (2014-12-03)
Fanfan Wang, Fang Wang, Dongqiang Zhu, Wei Chen
ABSTRACT

The abiotic transformation of nanomaterials in the natural environment can significantly affect their fate,transport, and effects. We observed that the adsorption affinities of graphene oxide nanoparticles(GONPs) for both phenanthrene and 1-naphthol were profoundly enhanced in the presence of sulfide, an environmentally relevant reductant, with doses as low as 0.5 mM Na(2)S per 10 mg/L GONPs. For phenanthrene adsorption enhancement was predominantly caused by the increased surface hydrophobicity from Na(2)S treatment. For 1-naphthol, however, adsorption enhancement was caused mainly by the conversion of the epoxy/ether groups on the surface of graphene oxide (GO) to the phenolic hydroxyl and carbonyl groups, which allowed more significant H-bonding between 1-naphthol and GONPs. The findings of this study underline that abiotic transformation of GO not only affects the stability and mobility of GONPs, but also influences the adsorptive interactions between GONPs and environmental contaminants, and consequently, may increase the environmental risks of GONPs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Phenanthrene, 98%
Supelco
Phenanthrene, analytical standard, for environmental analysis
Sigma-Aldrich
Phenanthrene, sublimed grade, ≥99.5%
Supelco
Phenanthrene, certified reference material, TraceCERT®
Supelco
1-Naphthol, PESTANAL®, analytical standard
Sigma-Aldrich
1-Naphthol, BioXtra, ≥99%
Sigma-Aldrich
1-Naphthol, ReagentPlus®, ≥99%
Sigma-Aldrich
1-Naphthol, puriss. p.a., reag. Ph. Eur., ≥99% (GC)