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Few Layer Graphene sticking by biofilm of freshwater diatom Nitzschia palea as a mitigation to its ecotoxicity

Garacci, Marion and Barret, Maialen and Mouchet, Florence and Sarrieu, Cyril and Lonchambon, Pierre and Flahaut, Emmanuel and Gauthier, Laury and Silvestre, Jérôme and Pinelli, Eric Few Layer Graphene sticking by biofilm of freshwater diatom Nitzschia palea as a mitigation to its ecotoxicity. (2017) Carbon, 113. 139-150. ISSN 0008-6223

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Official URL: http://dx.doi.org/10.1016/j.carbon.2016.11.033

Abstract

Carbon-based nanoparticles such as graphene have many applications leading to their industrial production. Few-Layer Graphene (FLG) is thus likely to be found in the environment, and especially in rivers. In this study, the effect of FLG on the photosynthetic benthic diatom Nitzschia palea was assessed making distinction between the impact of a direct contact with FLG and a shading effect of FLG on diatoms. Growth inhibition of diatoms exposed to FLG at 50 mg L-1 was observed at 48 h of exposure associated with an increase in diatoms mortality. At 144 h, the growth rate was recovered. However, in shading condition, at 48 h of FLG exposure, a persistent growth inhibitionwas observed at 50 mg L-1. Microscopic observations and a monitoring of FLG concentration in the medium allowed to conclude that exopolymeric substances (EPS), naturally secreted by N. palea, strongly interact with FLG, sticking nanoparticles at the bottom of wells. Our results highlight the potential mechanisms of clarification of the water column by diatoms biofilms, by sticking FLG even at high concentration. Overall, these results suggest that one potential toxicity process of graphene could be a combination of direct and shading effect leading to a strong interaction between biofilm and nanoparticles.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at http://www.sciencedirect.com/science/article/pii/S0008622316310077
HAL Id:hal-01557929
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Funders:
French Ministry of Higher Education and Research - European Union Seventh Framework Program
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Deposited By: cirimat webmestre
Deposited On:06 Jul 2017 14:28

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