Effects of water vapour and temperature on the retention of radiotoxic CH3I by silver faujasite zeolites
| Autor: | A. Roynette, B. Marcillaud, Céline Monsanglant-Louvet, Bruno Azambre, Mouheb Chebbi, Laurent Cantrel |
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| Přispěvatelé: | PSN-RES/SCA/LECEV, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes (LCP-A2MC), Université de Lorraine (UL), PSN-RES/SEREX/L2EC |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Materials science Health Toxicology and Mutagenesis Inorganic chemistry 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences engineering.material γ irradiation 01 natural sciences chemistry.chemical_compound Adsorption Molar ratio Environmental Chemistry [CHIM]Chemical Sciences Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Human decontamination γ-irradiation Faujasite Pollution Decomposition Severe nuclear accident chemistry 13. Climate action engineering Zeolites Water vapor Iodine trap Methyl iodide |
| Zdroj: | Journal of Hazardous Materials Journal of Hazardous Materials, Elsevier, 2021, 409, pp.124947. ⟨10.1016/j.jhazmat.2020.124947⟩ |
| ISSN: | 0304-3894 1873-3336 |
| Popis: | International audience; In this work, Ag/X and Ag/Y faujasite zeolites were evaluated as candidate sorbents for the retention of methyl iodide under conditions close to those expected in a severe nuclear accident. Different categories of tests were conducted from laboratory to semi-pilot scales. First, the effects of temperature and water vapour on the CH3I retention/decomposition mechanism were investigated under lab-scale conditions. More specifically, the CH3I adsorption capacities and the fate of its main decomposition products (oxygenated compounds and alkanes) were measured under dynamic conditions at different temperatures (35, 100 and 250 °C). Then, the decontamination factors of Ag/X and Ag/Y silver faujasites exchanged with different silver contents were monitored according to the time on stream using a very low CH3I concentration (1 ppmv). Finally, a parametric study was conducted at semi-pilot scale using realistic [CH3I]/[H2O] molar ratio ≈ 10−6 and temperatures in the range 20–90 °C. Those experiments were helpful in order to assess the effects of some important parameters relevant to the adsorbents or operating conditions. |
| Databáze: | OpenAIRE |
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