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標題: 以過渡金屬改質TiO2結合ITO薄膜電極降解有機污染物之研究
Study on the photocatalytic degradation of organic pollutants by thin layer TiO2/ITO electrode with ransition metal modification
作者: 張名毅
Chang, Ming-Yi
關鍵字: Vanadium;釩;Lanthanum;Indium-Tin Oxide;Photocatalytic reaction;Photoelectrocatalytic reaction;鑭;氧化銦錫玻璃;光觸媒電極;光電催化反應
出版社: 環境工程學系所
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本研究嘗試以過渡金屬釩(Vanadium)及鑭(Lanthanum)對二氧化鈦光觸媒進行改質,利用溶膠凝膠法製備TiO2光觸媒及V-TiO2、La-TiO2光觸媒,再經由含浸方式將光觸媒披覆於氧化銦錫導電玻璃(Indium-Tin Oxide)上,製備成電極形式;其中過渡金屬釩及鈦之莫耳比分別為0.05、0.10、0.20和0.30;鑭鈦莫耳比則為0.025、0.05、0.075及0.1作為實驗探討之最終比例。透過場發射掃描式電子顯微鏡(FE-SEM)、化學分析電子能譜儀(ESCA)、X-ray繞射儀(XRD)及表面等電荷點(pHIEP)分析不同光觸媒電極間的差異,並經由降解亞甲基藍(Methylene blue)及Acid Yellow 17 光催化及光電催化實驗,探討光觸媒電極之活性。
由FE-SEM、XRD及ESCA等特性分析結果可知,本研究製備之TiO2/ITO光觸媒電極,顆粒大小約為30 nm,結晶構造為銳鈦礦晶型。而V-TiO2/ITO光觸媒電極顆粒大小一致性差,粒徑大小為10 nm至100 nm不一,晶型則轉變成銳鈦礦及金紅石混合型晶型;而La-TiO2/ITO光觸媒電極顆粒大小一致,均小於10 nm,晶型轉變為銳鈦礦與金紅石(Rutile)複合型晶型,且隨著鑭的添加量提升金紅石的比例也隨之增加。

The object of this study is to modify the TiO2/ITO photocatalytic electrode with vanadium and lanthanum. The V-doped and La-doped TiO2/ITO photocatalytic electrodes were synthesized by sol-gel method and dip-coating method. Both V-TiO2/ITO and La-TiO2/ITO photocatalytic electrodes were characterized by Field emission scanning electron microscope(FE-SEM), Electron spectroscopy for chemical analysis system(ESCA), X-ray diffractometer(XRD)and Isoelectric point(pHIEP). The photocatalytic and photoelectrocatalytic activities were evaluated by the degradation of methylene blue and Acid Yellow 17 under different parameters.
As the results of the external analysis of SEM, ESCA and XRD, the particle size of the TiO2/ITO photocatalytic electrode is about 30 nm and mainly Anatase structure for V-TiO2/ITO. The particle size of V-TiO2/ITO photocatalytic electrodes is not uniform with the size range, from 10nm to 100 nm. But La-TiO2/ITO showed particles of regular shapes with smaller size (<10 nm) compared to the TiO2/ITO, which presented uniform particles of spherical structure and larger size (20 nm). The contents of the Rutile phase increase with the increase of the amount of doped Vanadium and Lanthanum.
Vanadium in the photocatalytic electrodes is in the status of V3+, V4+ and V5+ , and lanthanum in the photocatalytic electrodes is in the status of La2+, and La 3+ .The 0.30V/Ti photocatalytic electrode has the best ability both on the adsorption and photocatalytsis. Even in the visible light system, the 0.30V/Ti photocatalytic electrode has great photoactivity as same as in the UV light system. The V-doped TiO2/ITO photocatalytic electrodes may convert N-type semiconductor into P-type semiconductor.
其他識別: U0005-1108201017541800
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