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Metal-binding processes on Nanoplastics : Rare earth elements as a probe

Abstract : The nanoplastics presence in the ocean and soil demonstrates their global distribution in the environment. Due to their colloidal properties, nanoplastics could influence trace metal speciation in natural matrices, which has been poorly addressed due to the lack of methodology to assess the nanoplastics -metal association in the natural environment. To give a global picture of this property for nanoplastics, this work aims at using rare earth elements (REE) as a chemical probe to understand metal adsorption mechanisms that could occur onto nanoplastics surfaces, which is expected to be highly oxidized in the environment. Comparison between environmentally relevant nanoplastics’ models and REE-COOH complexes patterns demonstrated that REE are adsorbed through the COOH sites onto the nanoplastics. These adsorptions pathways follow a mono-ligand process for light REE and bi-ligand for heavy REE complexes, chelate being excluded. We demonstrated that the denticity of the complexes is influenced by the pH, REE loading, and competitive ions. Bi-ligand complexes with heavy REE dominate at pH>4.5 and low REE loading. This study is a novel approach in understanding NPs-metals interaction and highlights REE as a powerful tracer of sorption mechanisms.
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Submitted on : Monday, April 25, 2022 - 4:40:24 PM
Last modification on : Tuesday, July 19, 2022 - 10:08:38 AM
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Florent Blancho, Mélanie Davranche, Remi Marsac, Adrien Leon, Aline Dia, et al.. Metal-binding processes on Nanoplastics : Rare earth elements as a probe. Environmental science‎.Nano, Royal Society of Chemistry, 2022, 9 (6), pp.2094-2103. ⟨10.1039/D2EN00048B⟩. ⟨insu-03651384⟩



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