کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4485500 1316955 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A comparison of several nanoscale photocatalysts in the degradation of a common pollutant using LEDs and conventional UV light
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
A comparison of several nanoscale photocatalysts in the degradation of a common pollutant using LEDs and conventional UV light
چکیده انگلیسی

A comparative study on the photocatalytic activities of four different catalysts, P-25 TiO2, TiO2 nanofibers, tin-doped TiO2 nanofibers under UV light irradiation at 350 nm, and coumarin (C-343) coated TiO2 nanofibers at 436 nm light emitting diodes (LED) is reported. Catalysts performance has been compared based on their reflectance spectrum and activity. A common water contaminant 4-chlorophenol was used as a substrate to compare the activity of the different catalysts under both direct and dye sensitized conditions. Results indicated that amongst the four different catalysts the activity of P-25 was the highest. However the activity of C-343 coated TiO2 nanofibers in the LED (436 nm) based reactor was competitive. Identification of reaction intermediates implied that the reaction pathways under UV (band gap) and visible (dye sensitized) irradiation were different. Nonetheless, ring opening took place in all reactions with both maleic and dihydroxymaleic have been identified as intermediates. The study indicates that ordered arrays of TiO2 irradiated by panels of arrays of low cost high intensity LEDs might be used for the design of reactors. The near monochromaticity, long life, and operation under direct currents are advantages of using LEDs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 43, Issue 18, October 2009, Pages 4499–4506
نویسندگان
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