کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
575481 | 1453056 | 2016 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cerium oxide for the destruction of chemical warfare agents: A comparison of synthetic routes
ترجمه فارسی عنوان
اکسید سریم برای تخریب عوامل شیمیایی جنگ: مقایسه مسیرهای مصنوعی
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کلمات کلیدی
اکسید سریم، عوامل جنگ شیمیایی، ترکیبات ارگانوفسفره، ضدعفونی کردن،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
چکیده انگلیسی
Four different synthetic routes were used to prepare active forms of cerium oxide that are capable of destroying toxic organophosphates: a sol-gel process (via a citrate precursor), homogeneous hydrolysis and a precipitation/calcination procedure (via carbonate and oxalate precursors). The samples prepared via homogeneous hydrolysis with urea and the samples prepared via precipitation with ammonium bicarbonate (with subsequent calcination at 500 °C in both cases) exhibited the highest degradation efficiencies towards the extremely dangerous nerve agents soman (O-pinacolyl methylphosphonofluoridate) and VX (O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothioate) and the organophosphate pesticide parathion methyl. These samples were able to destroy more than 90% of the toxic compounds in less than 10 min. The high degradation efficiency of cerium oxide is related to its complex surface chemistry (presence of surface OH groups and surface non-stoichiometry) and to its nanocrystalline nature, which promotes the formation of crystal defects on which the decomposition of organophosphates proceeds through a nucleophilic substitution mechanism that is not dissimilar to the mechanism of enzymatic hydrolysis of organic phosphates by phosphotriesterase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 304, 5 March 2016, Pages 259-268
Journal: Journal of Hazardous Materials - Volume 304, 5 March 2016, Pages 259-268
نویسندگان
Pavel JanoÅ¡, JiÅà Henych, OndÅej Pelant, VÄra PilaÅová, LuboÅ¡ Vrtoch, Martin Kormunda, Karel Mazanec, Václav Å tengl,