کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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42790 | 45941 | 2009 | 7 صفحه PDF | دانلود رایگان |

Preparation of fine TaON particles is attempted to improve the photocatalytic activity for H2 evolution from aqueous methanol solution under visible light (λ > 420 nm). TaON is synthesized by nitriding Ta2O5 powder at 1123 K for 15 h under a flow of NH3. When nanoparticulate Ta2O5 with a primary particle size of 30–50 nm is used as the precursor, fine particles of TaON (FP-TaON) with 50–80 nm in size is obtained, but the primary particles aggregate to form larger secondary particles. Nitridation of Zr–Ta mixed oxide (Zr/Ta = 0.1) nanoparticles results in the production of a solid solution of monoclinic-ZrO2 and TaON exhibiting 30–50 nm primary particle size with less aggregation and higher activity, as compared to FP-TaON. Suppression of surface defects (reduced tantalum species) produced during nitridation from Ta2O5 to TaON is shown to be essential for achieving efficient H2 evolution using TaON-based photocatalysts.
Using nanoparticulate oxide precursors, fine particles of TaON and a solid solution of ZrO2 and TaON are prepared. Formation of a solid solution between ZrO2 and TaON is shown to be an effective approach to enhance photocatalytic activity of TaON for H2 evolution under visible light (λ > 420 nm).Figure optionsDownload as PowerPoint slide
Journal: Applied Catalysis A: General - Volume 357, Issue 2, 15 April 2009, Pages 206–212