کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5353000 | 1503683 | 2013 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase](/preview/png/5353000.png)
چکیده انگلیسی
Two methods, which is high temperature calcination method and doping La2O3 method, were used to prepare TiO2 with an adjustable surface crystalline structure. It has been shown that TiO2 powders with a tunable surface phase were obtained by carefully controlling the calcination temperature and calcination time. Compared with calcination method, it is difficult to prepare TiO2 with variable surface anatase-rutile ratio by La2O3 doping. UV Raman spectra and XRD clearly indicate that La2O3 can act as a stabilizer for the development of rutile phase from the bulk to surface region of La2O3-TiO2 sample, even after high temperature calcination. The rate of H2 production from methanol-water solution was used as an indicator for the photocatalytic activity of the TiO2 and La2O3-TiO2 samples. It is evident that enhanced activity of TiO2 is observed when the surface region is in the mixed phase, in comparison of the sample with pure surface anatase or pure surface rutile. The notable effect of surface phase on the photocatalytic activity of TiO2 is also observed in the La2O3-TiO2 sample. The rate of H2 production shows similar photocatalytic activities although their bulk rutile contents are greatly different in the La2O3-TiO2 samples, which is similar to that of undoped TiO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 280, 1 September 2013, Pages 304-311
Journal: Applied Surface Science - Volume 280, 1 September 2013, Pages 304-311
نویسندگان
Jing Zhang, Song Yan, Shanlin Zhao, Qian Xu, Can Li,