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標題: 以可見光催化 V-TiO2 光觸媒降解亞甲基藍之研究
Study on the degradation of methylene blue by V-TiO2 under visible light
作者: 胡正苓
Hu, Chen-Ling
關鍵字: Photocatalystic under visible light;可見光催化;Sol-gel method;V-TiO2;Methylene blue;溶膠凝膠法;含釩之二氧化鈦;亞甲基藍
出版社: 環境工程學系所
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本研究是製備在可見光下具有光催化活性之二氧化鈦光觸媒,其方法是利用兩種不同的溶膠凝膠法製備含釩之二氧化鈦,並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)、比表面積分析儀(BET)、X 光粉末繞射儀(XRD)及零電荷點 pH 值(pHzpc)分析以不同方法製備光觸媒與添加釩之光觸媒間的差異。經由亞甲基藍(Methylene blue)的可見光光催化實驗,探討合成光觸媒之活性差異。
在 FE-SEM 的結果顯示,光觸媒顆粒大約在 30 nm 左右,可知合成之光觸媒可達奈米等級;ESCA 的結果顯示,添加釩於二氧化鈦不會造成表面二氧化鈦氧化數的改變,而釩可能是以 V3+、V4+ 與 V5+ 存在於二氧化鈦表面;BET 結果顯示,釩之添加會造成二氧化鈦孔隙率的減少而降低其比表面積;XRD 結果顯示,二氧化鈦主要晶形為 Anatase,當釩的添加量超過一定比例時,V-TiO2 的晶形主要為 Rutile;pHzpc 結果顯示,添加釩之二氧化鈦有較低之 pHzpc。
兩種溶膠凝膠法製備之 V-TiO2 以亞甲基藍的脫色與礦化反應進行可見光催化活性之試驗,且與成品 Janssen TiO2 相比較,結果顯示,經過釩改質之二氧化鈦,可提升光觸媒對可見光之應答;在不同 pH 條件下會影響光觸媒之活性,本實驗在可見光系統中,pH 2 與 pH 7 在脫色與礦化方面有較顯著之效果。根據實驗之結果,進一步推論 V-TiO2 的作用機制。

The object of this study is the synthesis of visible-light responsed TiO2 photocatalysts. The V-doped TiO2 was synthesized by two different sol-gel methods. The prepared photocatalysts were characterized by Field emission scanning electron microscope (FE-SEM), Electron spectroscopy for chemical analysis system (ESCA), Brunauer emmett teller (BET), X-ray powder diffractometer (XRD) and Point of zero charge (pHzpc). The photocatalytic activity was evaluated by the degradation of methylene blue under visible light.
From the external analysis of SEM, ESCA and XRD, the results showed that the particle size of TiO2 was about 30 nm and mainly Anatase structure, but the contents of the Rutile phase increased with the increase of the amount of doped Vanadium on TiO2. The valence number of V-TiO2 photocatalyst were not altered and Vanadium in the TiO2 structure was in the status of V3+, V4+ and V5+. According to the BET, doped Vanaduium on TiO2 would decrease the surface area due to decrease of porosity. The pHzpc of V-TiO2 phtotcatalyst were lower than pure TiO2.
Compare with Janssen TiO2, the V-TiO2 have better response of visible light. In visible light/V-TiO2 system, at pH 2 and pH 7 have better discoloration and mineralization. The photocatalystic reaction mechanism was investigated by visible light/V-TiO2 system.
其他識別: U0005-2706200711185100
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