Transformation of C-60 fullerene aggregates suspended and weathered under realistic environmental conditions

Type Article
Date 2018-03
Language English
Author(s) Sanchis Josep1, Aminot YannORCID2, Abad Esteban1, Jha Awadhesh N.2, Readman James W.2, 3, Farre Marinella1
Affiliation(s) 1 : CSIC, IDAEA, Inst Environm Assessment & Water Res, Water & Soil Qual Res Grp, C Jordi Girona 18-26, Barcelona 08034, Catalonia, Spain.
2 : Plymouth Univ, Biogeochem Res Ctr, Plymouth PL4 8AA, Devon, England.
3 : Plymouth Marine Lab, Prospect Pl, Plymouth PL1 3DH, Devon, England.
Source Carbon (0008-6223) (Pergamon-elsevier Science Ltd), 2018-03 , Vol. 128 , P. 54-62
DOI 10.1016/j.carbon.2017.11.060
WOS© Times Cited 18
Abstract

The occurrence, fate and behaviour of carbon nanomaterials in the aquatic environment are dominated by their functionalization, association with organic material and aggregation behaviour. In particular, the degradation of fullerene aggregates in the aquatic environment is a primary influence on their mobility, sorption potential and toxicity. However, the degradation and kinetics of water suspensions of fullerenes remain poorly understood. In the present work, first, an analytical method based on liquid chromatography and high-resolution mass spectrometry (LC-HRMS) for the determination of C-60 fullerene and their environmental transformation products was developed. Secondly, a series of C-60 fullerene water suspensions were degraded under relevant environmental conditions, controlling the salinity, the humic substances content, the pH and the sunlight irradiation. Up to ten transformation products were tentatively identified, including epoxides and dimers with two C-60 units linked via one or two adjacent furane-like rings. Fullerenols were not observed under these environmentally relevant conditions. The kinetics of generation of each transformation product were studied with and without simulated sunlight conditions. The ionic strength of the media, its pH and the humic substances content were observed to modulate the kinetics of generation.

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