Incineration of a Commercial Coating with Nano CeO2

5th Nanosafe International Conference on Health and Safety issues related to nanomaterials for a socially responsible approach

物理学;医药卫生;材料科学

Le Bihan, Olivier^1 ; Ounoughene, Ghania^2 ; Meunier, Laurent^1 ; Debray, Bruno^1 ; Aguerre-Chariol, Olivier^1

INERIS, France^1

KU Leuven, Department of Chemical Engineering, Leuven, Belgium^2

关键词: Commercial coatings;    Environmental risks;    Icp-ms analysis;    Incineration plant;    Individual particles;    Low-pressure impaction;    Number concentration;    Residual materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/838/1/012023/pdf
DOI  :  10.1088/1742-6596/838/1/012023

来源: IOP

【 摘 要 】

The potential environmental risk arising from the incineration of waste containing nanomaterials is a new field which deserves further attention. Some recent studies have begun to focus on this topic but the data are incomplete. In addition, there is a need to consider real life waste. The present study gives some insight into the fate and behavior of a commercial coating containing a commercial additive (7% w/w) based on nano-CeO2 (aggregates of 10 to 40 nm, with elemental particles of 2-3 nm). The tests have been conducted with a system developed in the frame of the NanoFlueGas project. The test protocol was designed to respect the regulatory criteria of a good combustion in incineration plants (temperature around 850°C, highly ventilated combustion, at least 2 s residence time for the combustion gas in a post-combustion chamber at 850°C, and high oxygen/fuel contact). Time tracking by electric low pressure impaction (ELPI) shows that the incineration produces aerosol with number concentration dominated by sub-100 nm particles. Cerium is observed by TEM and EDS analysis but as a minor compound of a sub-group of particles. No nanoCeO2 particles have been observed in the aerosol. ICP-MS analysis indicates that the residual material consists mainly of CeO2 (60% of the mass). Observation by TEM establishes that this material is in the form of aggregates with individual particle of 40-200 nm and suggests that sintering occurred during incineration. As a conclusion, the lab scale incineration study led mainly to the release of nano-CeO2 in the residual material, as the major component. Its size distribution is different than the one of the nano-CeO2 observed in the initial sample before incineration. Additional research is needed to improve the understanding of nanoCeO2 behavior, and to integrate experiments at lab and real scale.