Journal
ENVIRONMENTAL POLLUTION
Volume 192, Issue -, Pages 147-153Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.05.018
Keywords
Bioavailability; Sorption kinetics; Black carbon; Engineered nanomaterials; Nanoparticles
Categories
Funding
- Swiss National Science Foundation [200021-118028, 200020-134688]
- Federal Office for the Environment
- Swiss National Science Foundation (SNF) [200021_118028, 200020_134688] Funding Source: Swiss National Science Foundation (SNF)
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Carbon nanotubes (CNT) are strong sorbents for organic micropollutants, but changing environmental conditions may alter the distribution and bioavailability of the sorbed substances. Therefore, we investigated the effect of green algae (Chlorella vulgaris) on sorption of a model pollutant (diuron, synonyms: 3-(3,4-Dichlorophenyl)-1,1-dimethylurea, DCMU) to CNT (multi-walled purified, industrial grade, pristine, and oxidized; reference material: Diesel soot). In absence of algae, diuron sorption to CNT was fast, strong, and nonlinear (Freundlich coefficients: 10(5.79)-10(6.24) mu g/kg(CNT).(mu g/L)(-n) and 0.62-0.70 for K-F and n, respectively). Adding algae to equilibrated diuron-CNT mixtures led to 15-20% (median) diuron redissolution. The relatively high amorphous carbon content slowed down ad-/desorption to/from the high energy sorption sites for both industrial grade CNT and soot. The results suggest that diuron binds readily, but - particularly in presence of algae - partially reversibly to CNT, which is of relevance for environmental exposure and risk assessment. (C) 2014 Elsevier Ltd. All rights reserved.
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