Stability of CeO2 nanoparticles from paints and stains: insights under controlled and environmental scenarios,Environmental Science: Nano

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Stability of CeO2 nanoparticles from paints and stains: insights under controlled and environmental scenarios
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-01 , DOI: 10.1039/d2en00210h
Ibrahim Jreije ₁ , Agil Azimzada ₁ , Madjid Hadioui ₁ , Kevin J. Wilkinson ₁

Affiliation

Due largely to their ability to absorb UV light, cerium oxide (CeO₂) nanoparticles (NP) are now widely used in numerous surface coatings. The release of CeO₂ NP from the surface coatings and their subsequent fate in the environment is difficult to evaluate, and to-date, has either been modelled, estimated using elemental mass balances or measured under controlled laboratory conditions. Single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) is emerging as one of the best techniques for detecting very small NP at very low concentrations in complex media such as natural waters, soils or biota. In this study, we first examined the role of different physicochemical properties (e.g., pH, ionic strength, and concentration of natural organic matter) on CeO₂ NP that were found in a paint and a stain. Their stability was then evaluated in rainwater over 30 days. Depending on the properties of the media, Ce NP concentrations in the paint decreased by 65–90%, whereas those in the stain decreased by 15–35% after 30 days. The loss was attributed to either dissolution or agglomeration/sedimentation. Finally, we quantified and characterized the release of both dissolved and particulate Ce from the two surface coatings under natural weathering conditions. In that case, Ce released from painted and stained panels was mainly shown to be in its dissolved metal forms. After 23 weeks of exposure, up to 15% of the Ce applied as paint and up to 35% of the Ce applied as stain were released into the precipitation. Nonetheless, no Ce NP beyond background levels were detected – all release appeared to be in the form of dissolved Ce.

中文翻译：

涂料和污渍中 CeO2 纳米颗粒的稳定性：受控和环境情景下的见解

由于其吸收紫外线的能力，二氧化铈 (CeO ₂ ) 纳米粒子 (NP) 现在广泛用于许多表面涂层中。_{CeO 2} NP 从表面涂层的释放及其随后在环境中的命运很难评估，迄今为止，要么使用元素质量平衡进行建模、估计，要么在受控的实验室条件下进行测量。单粒子电感耦合等离子体质谱 (SP-ICP-MS) 正在成为检测复杂介质（如天然水、土壤或生物群）中极低浓度极小 NP 的最佳技术之一。在这项研究中，我们首先检查了不同物理化学性质的作用（例如、pH、离子强度和天然有机物浓度）在 CeO _2上在油漆和污渍中发现的 NP。然后在 30 天的雨水中评估它们的稳定性。根据介质的性质，涂料中的 Ce NP 浓度降低了 65-90%，而污渍中的 Ce NP 浓度在 30 天后降低了 15-35%。损失归因于溶解或结块/沉淀。最后，我们量化并表征了在自然风化条件下两种表面涂层中溶解和颗粒 Ce 的释放。在那种情况下，从涂漆和染色面板中释放的 Ce 主要表现为溶解的金属形式。暴露 23 周后，多达 15% 的用作油漆的 Ce 和多达 35% 的用作着色剂的 Ce 释放到沉淀物中。尽管如此，

更新日期：2022-07-01

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