氮硼共摻雜二氧化鈦的合成及鑑定與光催化應用

Synthesis, Characterization and Photocatalytical Applications of N, B-codoped Titanium (IV) Oxide

周長志(Chang-Chih Chou)

指導教授 ： 許憲呈

長榮大學/管理學院/經營管理研究所(博)/碩士(2010年)

https://doi.org/10.6833/CJCU.2010.00148

摘要

由於二氧化鈦的穩定性、低價格及低毒性，在環境的應用上是最佳的光催化劑。然而，因為它大的能隙差(銳鈦礦 3.2 eV)，只有在紫外線的照射下(波長< 387 nm)才被視為是活性光催化劑。本研究中以雜氟硼酸銨為氮及硼先驅物的改質二氧化鈦，在可見光照射下氮、硼共摻雜二氧化鈦的光催化活性。在製備樣本主要是以氟硼酸銨為氮、硼來源，使用溶膠凝膠法可製備氮、硼共摻雜二氧化鈦。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，分析鑑定製備改質後的二氧化鈦粉體特性。在紫外光-可見光的照射下，以亞甲基藍的降解作為改質二氧化鈦光催化活性的評估。最後實驗測試後，發現氮、硼共摻雜二氧化鈦分析的結果發現：硼、氮順利的摻雜於二氧化鈦的晶格中，且吸收波中有紅移現象。在亞甲基藍光催化降解實驗中發現，本研究製備改質的二氧化鈦在對亞甲基藍的降解效率明顯優於純的二氧化鈦和P25等樣本的降解效率。在本研究中我們合成催化能力隨不同比例氟硼酸銨而變化並且我們試的去尋找在最佳條件下製備氮、硼共摻雜TiO2，光催化活性測試實驗中也可以發現紫外光-可見光的照射下對亞基藍溶液降解是重要的條件之一。

關鍵字

氮、硼共摻雜 ； 二氧化鈦 ； 溶膠凝膠法 ； 光觸媒

並列摘要

Titanium (IV) oxide is the best photocatalyst for widespread environmental applications due to its stability, low cost, and non-toxicity. However, because of its large band gap (3.2 eV for anatase), TiO2 can be considered as the active photocatalyst only under ultraviolet (UV) light (wavelength < 387 nm). Therefore, in this study we report the synthesis of modification Titanium (IV) oxide, using ammonium terafluoroborate as the N and B precursors, and the photocatalytic activity of N, B-codoped TiO2 under visible light. N, B-codoped TiO2 was obtained by a modified sol-gel method with ammonium terafluoroborate as the N and B source. 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). The photocatalytic activity was evaluated by the degradation of methylene blue (MB) under UV/VIS light. The results found that boron and nitrogen was doped into the titanium (IV) oxide lattice and this N, B-codoped TiO2 had a phenomenon of red shift. In photocatalytic degradation methylene blue experiments, the modified TiO2 photocatalyst shows better activity those that of the pure and P25 titanium (IV) oxide. In this study we prepare the modification titanium (IV) oxide photocatalyst which catalytic abilities vary with different molar ratios of ammonium terafluoroborate. We found the synthesis of N, B-codoped TiO2 in an optimum condition is important for the photocatalytic degradation of methylene blue under UV/VIS light irradiation.

並列關鍵字

N, B-codoped ； Titanium (IV) oxide, ； sol-gel method ； photocatalyst

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