کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5363104 1503692 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Humidity effect on photocatalytic activity of TiO2 and regeneration of deactivated photocatalysts
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Humidity effect on photocatalytic activity of TiO2 and regeneration of deactivated photocatalysts
چکیده انگلیسی

Photocatalytic decomposition of toluene was studied using commercially available TiO2 nanocatalysts (Degussa P25) under different ranges of relative humidity (RH). The toluene removal efficiency (sum of toluene adsorption, and partial and total oxidation) decreased with increasing RH, whereas the selectivity to CO2 in toluene oxidation enhanced. The enhancement in activity in terms of total oxidation at higher RH led to suppressing deactivation of TiO2 with time. On the basis of the humidity effect on photocatalytic reaction, deactivated TiO2 catalyst could recover their activity through the regeneration process consisting of exposure of the deactivated catalysts to the UV light under high RH conditions. The regenerated catalysts under high RH showed a higher total oxidation yield of toluene than that of the original catalysts due to the formation of more hydroxyl groups on TiO2 surface during the regeneration process.

► Photocatalytic activity of TiO2 for toluene oxidation under various relative humidities. ► Deactivated photocatalyst can be regenerated by exposure under UV at high humidity conditions. ► The regenerated catalysts show higher CO2 yield than the original one. ► Enhancement of total oxidation of toluene by surface OH groups.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 271, 15 April 2013, Pages 164-170
نویسندگان
, , , , , ,