Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5692
標題: 利用過渡金屬La改質TiO2/ITO光觸媒電極特性及光活性之研究
Study on the characteristics and photoactivity for La-modified TiO2/ITO photocatalytic electrode
作者: 王維甫
Wang, Wei-Fu
關鍵字: Lanthanum
過渡金屬鑭
Indium-Tin Oxide
Photocatalytic
Photoelectrocatalyti
氧化銦錫導電玻璃
光催化反應
光電催化反應
出版社: 環境工程學系所
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摘要: 本研究嘗試利用過渡金屬鑭(Lanthanum)改質二氧化鈦光觸媒,利用溶膠凝膠法(Sol-gel Method)製備TiO2光觸媒及La- TiO2光觸媒,再經由含浸法(Dip-coating)將製備之光觸媒均勻批覆於載體氧化銦錫導電玻璃(Indium-Tin Oxide)上,製備成電極型式;其中以鑭鈦莫耳比表示添加鑭之比例,分別為0.025、0.05、0.075以及0.1。透過場發射掃描式電子顯微鏡(FE-SEM)、X光粉末繞射儀(XRD)、化學分析電子能譜儀(ESCA)、比表面積(BET)以及表面等電荷點(pHIEP)分析不同鑭鈦莫耳比光觸媒電極間之差異,並選定目標污染物Acid Yellow 17 進行光催化以及光電催化實驗,探討各光觸媒電極之活性。 由FE-SEM、XRD及ESCA等特性分析結果可知,製備之TiO2/ITO光觸媒其結構均勻,顆粒粒徑約為20 nm左右,結晶晶型以銳鈦礦(Anatase)為主。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。 於本研究中,吸附或是光解實驗均以鑭鈦莫耳比0.05之光觸媒電極有最佳之去除Acid Yellow 17效果。不同光源之實驗,則是以紫外光為光源有較佳之去除效益。光電催化實驗之結果,外加電壓2.0V可以有效提升可見光光源下之催化能力。 關鍵字:過渡金屬鑭、氧化銦錫導電玻璃、光催化反應、光電催化反應。
The aim of this study has been to develop the TiO2/ITO photocatalytic electrode, modified by Lanthanum, to enable high photocatalytic and photoelectrocatalytic activities under UV light and visible light irradiation. The different molar ratios of La/Ti (0.025, 0.050, 0.075 and 0.100) photocatalytic electrodes use in this study were synthesized by sol-gel method and dip-coating method. Both 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 Acid Yellow 17. The XRD pattern of TiO2/ITO presents only anatase phases, but for La-TiO2/ITO presents both anatase and rutile phases. The contents of the rutile phase increased with the increase of the molar ratio of V/Ti. The SEM image of the La-TiO2/ITO showed particles of regular shapes with smaller size (<10nm) compared to the TiO2/ITO, which presented uniform particles of spherical structure and larger size (20nm). The La-TiO2/ITO photocatalytic electrode with molar ratio 0.050 shows the best ability both on the absorbtion and photocatalytsis. The photocatalytic electrodes modified by La shows the stronger photocatalytci ability under UV light then under visible light irradiation. Applied potential 2.0V would effectively increase the photoelectrocatlaytic activity under visible light irradiation. Keywords : Lanthanum、Indium-Tin Oxide、Photocatalytic、Photoelectrocatalytic
URI: http://hdl.handle.net/11455/5692
其他識別: U0005-1805200912573900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1805200912573900
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