氟硼共摻雜二氧化鈦金紅石相之合成與催化研究

近來許多科技產業使用奈米二氧化鈦光催化技術來淨化空氣和降低水中的污染物濃度以改善生活環境，主要是奈米二氧化鈦奈米成本低、低毒性、光穩定性。雖然二氧化鈦受到廣泛應用，但其光氧化反應過程效率卻很低，因為它只有在紫外線的照射下(波長< 387nm)才被視為是活性光催化劑。本研究中以氟及硼為前驅物去改質二氧化鈦，製備單獨氟摻雜及氟硼共摻雜二氧化鈦粉末樣本，使在可見光照射這兩種二氧化鈦樣本具備光催化活性。在製備樣本主要是以三氟醋酸酐為氟的來源，硼酸為硼的來源，使用溶膠凝膠法製備單獨氟摻雜及氟、硼共摻雜二氧化鈦。再經由使用紫外光可見光分光譜儀、X射線光電子光譜分析、X- ray繞射法、拉曼光譜光分析法和掃描式電子顯微鏡等儀器的分析結果，鑑定製備改質後的二氧化鈦粉體特性。實驗結果發現，單獨氟摻雜及氟硼共摻雜二氧化鈦粉末，燒結溫度越高粉體粒徑越大，粉體特性也隨著改變，且氟原子及硼原子成功的摻雜進入二氧化鈦晶格中；粉體經燒結後，氟摻雜二氧化鈦樣本(氟鈦莫耳比為6：4)於低溫（>700℃）時有金紅石相產生，而氟硼共摻雜(氟比鈦莫耳比10：90、硼比鈦莫耳比0.01：1)則是700℃時才有金紅石相產生，吸收波長有紅移現象且吸收波長落在可見光區。在本研究光催化降解結果顯示：製備改質的二氧化鈦在可見光中進行降解亞甲基藍，明顯優於純二氧化鈦及P25的降解效能。

關鍵字

氟硼摻雜；二氧化鈦；溶膠凝膠法；亞甲基藍降解；可見光光催化

並列摘要

Titanium (IV) oxide(TiO2) photocatalytic technology has provided an effective and promising means for the remediation of environmental pollutants with low concentrations in air and water . Titanium dioxide has been used widely due to its low cost, photostability and non-toxicity. However, its wide application is still retarded by the low efficiency of the photo-oxidative process because TiO2 can be considered as an active photocatalyst only under ultraviolet (UV) light (wavelength < 387 nm). Therefore, in this study we reported the synthesis of doped TiO2 using a modified sol-gel method with trifluoroacetic anhydride and boric acid as the F and B sources, and the stimulation of photocatalytic activity of the F-doped and F, B-codoped TiO2 under visible light. The TiO2 catalyst was characterized by UV/VIS spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction method (XRD), Raman spectroscopy analysis and scanning electron microscope (SEM). In this study, the F-doped and F,B-codoped TiO2 could be found that the gain sizes were large and the powder properties changed with the increasing of temperature. The result of XPS spectra showed that the F and B were doped into the lattice TiO2. After cacination, the F-doped TiO2 samples(molar ratio of F to Ti=6:4) show rutile phase below700℃, but the FB co-doped TiO2 samples(molar ratio of F to Ti=10:90，B to Ti=0.01:1) have rutile phase till 700℃. The evidence showed the phenomenon of red shift for these modified doped TiO2 samples. In photocatalytic degradation experiments of methylene blue, the modified TiO2 photocatalysts show better photoactivities than those of the pure and P25 titanium (IV) oxide.

並列關鍵字

F,B-codoped ； Titanium (IV) oxide ； sol-gel method ； methylene blue degradation ； visible light photocatalysis

參考文獻

周長志 (2010) 氮硼共摻雜二氧化鈦的合成及鑑定與光催化應用,長榮大學職業安全與衛生研究所碩士學位論文

李秉奕 (2011) 摻雜氮、硼、氟二氧化鈦配製與光催化研究,長榮大學職業安全與衛生研究所碩士學位論文

Todorova N., Giannakopoulou T., Romanos G., Vaimakis T., Yu J. and Trapalis C. (2008) “Preparation of fluorine-doped TiO2 photocatalysts with controlled crystalline structure”, International Journal of Photoenergy Article ID 534038, 9 pages.

呂怡萱 (2006) 二氧化鈦奈米管於染料敏化太陽能持之探討,國立中央大學化學研究所碩士學位論文

賴信穎 (2007) 二氧化鈦添加氫氧基磷灰石對水中污染物光分解之效應,國立成功大學化學工程研究所碩士學位論文

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氟硼共摻雜二氧化鈦金紅石相之合成與催化研究

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