Non-linear release dynamics for a CeO2 nanomaterial embedded in a protective wood stain, due to matrix photo-degradation. (October 2018)

• Record Type: Journal Article
• Authors: Scifo, Lorette; Chaurand, Perrine; Bossa, Nathan; Avellan, Astrid; Auffan, Mélanie; Masion, Armand; Angeletti, Bernard; Kieffer, Isabelle; Labille, Jérôme; Bottero, Jean-Yves; Rose, Jérôme
• Is Part Of: Environmental pollution. Volume 241(2018)
• Page Start: 182
• Page End: 193
• Publication Date: 2018-10
• Subjects: Aging of nanomaterials -- Engineered nanomaterials (ENM) release -- Photo-degradation -- Polymer nanocomposites -- Acrylic stain; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2018.05.045
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The release of CeO2 -bearing residues during the weathering of an acrylic stain enriched with CeO2 nanomaterial designed for wood protection (Nanobyk brand additive) was studied under two different scenarios: (i) a standard 12-weeks weathering protocol in climate chamber, that combined condensation, water spraying and UV–visible irradiation and (ii) an alternative accelerated 2-weeks leaching batch assay relying on the same weathering factors (water and UV), but with a higher intensity of radiation and immersion phases. Similar Ce released amounts were evidenced for both scenarios following two phases: one related to the removal of loosely bound material with a relatively limited release, and the other resulting from the degradation of the stain, where major release occurred. A non-linear evolution of the release with the UV dose was evidenced for the second phase. No stabilization of Ce emissions was reached at the end of the experiments. The two weathering tests led to different estimates of long-term Ce releases, and different degradations of the stain. Finally, the photo-degradations of the nanocomposite, the pure acrylic stains and the Nanobyk additive were compared. The incorporation of Nanobyk into the acrylic matrix significantly modified the response of the acrylic stain to weathering. Graphical abstract: Highlights: Release of Ce due to matrix photo-degradation. 2 distinct phases of release. The release of 1 wt% of the initial Ce mass appears as a realistic scenario for outdoor exposure of ca. 3.5 years. The presence of CeO2 nanoparticles in the acrylic stain modifies the behavior of the matrix toward weathering. Abstract : The weathering of a nano-CeO2 -enriched acrylic stain caused a multi-regime non-linear Ce release, accompanied by mutually dependent aging of both the matrix and the CeO2 -nanomaterial.