| Autre titre | Photodegradation of bis(1H-tetrazol-5-yl)amine (H2BTA), a high nitrogen content tetrazole-based energetic compound in water |
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| Téléchargement | - Voir la version de l’auteur : Photodegradation of bis(1H-tetrazol-5-yl)amine (H₂BTA), a high nitrogen content tetrazole-based energetic compound in water (PDF, 429 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1016/j.chemosphere.2019.125008 |
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| Auteur | Rechercher : Halasz, Annamaria1; Rechercher : Hawari, Jalal; Rechercher : Perreault, Nancy N.1 |
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| Affiliation | - Conseil national de recherches du Canada. Énergie, les mines et l'environnement
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| Format | Texte, Article |
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| Sujet | H₂BTA; photolysis; simulated sunlight; 254 nm; pH effect; environmental fate |
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| Résumé | Tetrazoles have wide industrial applications, notably in the pharmaceutical industry. Tetrazole derivatives such as bis(1H-tetrazol-5-yl)amine (H₂BTA) have recently been considered by the defense industry as high nitrogen composite propellants. Photodegradation studies under solar simulating conditions showed that H₂BTA was partially degraded in water, while it was completely degraded under UV light at 254 nm. When H₂BTA (0.35 mM) was irradiated with simulated sunlight at pH 3.65, there was a 1-day lag phase before the chemical started to degrade, reaching 43.5% degradation after 7 d. However, when pH increased to 5.76, it degraded without lag phase, suggesting that an HBTA⁻ anion was involved in the initial degradation of the chemical. 5-Aminotetrazole (5-AT) was identified as a final degradation product and N-(1H-tetrazol-5-yl)formamide(T(5 yl)FA) and 1H-tetrazol-5-ylcarbamic acid (T(5 yl)CA) as intermediate products. At λ = 254 nm, H₂BTA disappeared rapidly, resulting in the loss of 94% after 65 min. 5-AT was detected together with several transient products including N-(1H-tetrazol-5-yl)carbamohydrazonic acid (T(5 yl)CHA) and T(5 yl)FA. Kinetic studies and products analysis revealed that H₂BTA photodegraded via two initial routes. One route (a) marked by the initial loss of HN₃ and another (b) marked by the initial loss of N₂. Route a) was characteristics for irradiation with simulated sunlight; however, routes a) and b) proceeded simultaneously under UV light. 5-AT eventually degraded to presumably give N₂ and/or HN₃ under UV light. Understanding the photodegradation pathway of H₂BTA under simulated sunlight can help in providing the basis for natural attenuation assessment of the chemical in contaminated aquatic environments. |
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| Date de publication | 2019-09-30 |
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| Maison d’édition | Elsevier |
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| Dans | |
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| Publication connexe | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRC-EME-56009 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 5ef0c690-6107-4b78-b8cd-a09616766688 |
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| Enregistrement créé | 2019-12-04 |
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| Enregistrement modifié | 2020-06-26 |
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