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Adsorption of carbamazepine by carbon nanotubes: effects of DOM introduction and competition with phenanthrene and bisphenol A.

Environmental pollution (Barking, Essex : 1987) (2013-08-07)
Ilya Lerman, Yona Chen, Baoshan Xing, Benny Chefetz
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Phenanthrene, 98%
Sigma-Aldrich
Bisphenol A, 97%
Supelco
Bisphenol A, ≥99%
Supelco
Phenanthrene, analytical standard, for environmental analysis
Sigma-Aldrich
Phenanthrene, sublimed grade, ≥99.5%
Supelco
Phenanthrene, certified reference material, TraceCERT®
Supelco
Carbamazepine solution, 1.0 mg/mL in methanol, ampule of 1 mL, certified reference material, Cerilliant®
Sigma-Aldrich
Carbamazepine, powder
Sigma-Aldrich
Carbamazepine, meets USP testing specifications
Supelco
Phenanthrene solution, certified reference material, 5000 μg/mL in methanol
Supelco
Carbamazepine, Pharmaceutical Secondary Standard; Certified Reference Material