کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6493150 | 44019 | 2009 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photoactivity of mechanochemically prepared nanoparticulate titanium dioxide investigated by EPR spectroscopy
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
EBGDIPPMPOPOBNABTSEDXDPPHDMPO1,1-diphenyl-2-picrylhydrazyl - 1،1-دیفنیل-2-پریکیل هیدرازیل5,5-dimethyl-1-pyrroline N-oxide - 5،5-دی متیل-1-پیرولین N-اکسیدUV/Vis - UV / Visα-(4-pyridyl-1-oxide)-N-tert-butylnitrone - α- (4-پیریدیل-1-اکسید) -N-tert-butylnitroneEnergy Dispersive X-ray Spectroscopy - اشعه ماوراء بنفش اشعه ایکسband-gap energy - انرژی باند با شکافTem - این استEPR - تشدید پارامغناطیس الکترونElectron paramagnetic resonance - تشدید پارامغناطیس الکترونSpin trapping - تله اسپینAbsorption and scattering - جذب و پراکندگیTitanium dioxide - دی اکسید تیتانیومTempol - سریعmechanochemical synthesis - سنتز مکانیکمیEPR spectroscopy - طیف سنجی EPRultraviolet/visible - ماوراء بنفش / قابل مشاهده استTransmission electron microscopy - میکروسکوپ الکترونی عبوریXRD - پراش اشعه ایکسX-ray diffraction - پراش اشعه ایکس
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Photoactivity of mechanochemically prepared nanoparticulate titanium dioxide investigated by EPR spectroscopy Photoactivity of mechanochemically prepared nanoparticulate titanium dioxide investigated by EPR spectroscopy](/preview/png/6493150.png)
چکیده انگلیسی
Titanium dioxide nanopowders were prepared by mechanochemical synthesis in a high-energy ball mill using TiOSO4·xH2O and Na2CO3 followed by annealing in the temperature range 200-800 °C. The UVA photonic efficiency of radical processes on synthesized TiO2 powders was determined by in situ EPR spectroscopy, using, as indicators, the N-oxide spin trapping agents (5,5-dimethyl-1-pyrroline N-oxide and 5-(diisopropoxy-phosphoryl)-5-methyl-1-pyrroline N-oxide) or the radical cation of 2,2â²-azino-bis(3-ethylbenzothiazoline-6-sulfonate, ABTS+). The results obtained by monitoring the photoinduced generation of hydroxyl radical spin adducts correlated with those found by the investigation of the photoreduction of ABTS+. The presence of iron and chromium ions, which were evidenced in samples milled in steel, decreased the photonic efficiency of radical processes. The presence of a sulfate salt matrix during the annealing process distinctly inhibits the transformation of anatase to rutile. The highest photocatalytic activity was shown by anatase samples which were prepared by milling in corundum and annealed at 700 °C. They were composed of crystallites with a mean size of 25-30 nm and well developed crystal faces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 206, Issues 2â3, 15 August 2009, Pages 177-187
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 206, Issues 2â3, 15 August 2009, Pages 177-187
نویسندگان
Vlasta Brezová, Zuzana Vrecková, Peter Billik, Mária ÄaploviÄová, Gustav Plesch,