کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
583414 | 1453173 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photodegradation kinetics of formaldehyde using light sources of UVA, UVC and UVLED in the presence of composed silver titanium oxide photocatalyst
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This study investigated the surface modification of photocatalyst and photodecomposition of formaldehyde from indoor pollution source. This study explored the feasibility of the application of the ultraviolet light emitting diode (UVLED) instead of the traditional ultraviolet (UV) lamp to treat the formaldehyde. The photocatalytic decomposition of formaldehyde at various initial concentrations was elucidated according to the Langmuir-Hinshelwood model. The reaction rate constant (k) and adsorption equilibrium constant (KL) over 0.334 g silver titanium oxide photocatalyst (Ag/TiO2) coated on glass sticks with 254 nm ultraviolet lamp (UVC), 365 nm ultraviolet lamp (UVA), and UVLED are 650 ppmv minâ1 and 2 Ã 10â4 ppmvâ1, 500 ppmv minâ1 and 1.04 Ã 10â4 ppmvâ1, and 600 ppmv minâ1 and 2.52 Ã 10â5 ppmvâ1, respectively. A comparison of the simulation results with the experimental data was also made, indicating good agreement. The magnitudes of energy effectiveness (Ee) are in the order of UVLED (0.6942 mg kWâ1 hâ1) > UVA (0.007 mg kWâ1 hâ1) > UVC (0.0053 mg kWâ1 hâ1). The Ee of UVLED is 131 times larger than that of UVC. The UVLED can save a lot of energy in comparison with the traditional UV lamps. Thus, this study showed the feasible and potential use of UVLED in photocatalysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 155, Issues 1â2, 30 June 2008, Pages 164-172
Journal: Journal of Hazardous Materials - Volume 155, Issues 1â2, 30 June 2008, Pages 164-172
نویسندگان
Je-Lueng Shie, Chia-Hsiang Lee, Chyow-San Chiou, Chang-Tong Chang, Chia-Chi Chang, Ching-Yuan Chang,