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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/3766


    Title: 在二氧化鈦上進行Salicylic acid可見光 光催化反應的研究
    Authors: 張仕正;Shin-Cheng Chang
    Contributors: 化學工程與材料工程研究所
    Keywords: 可見光光催化;二氧化鈦;溶膠凝膠法;過渡金屬離子;photocatalysis;titanium oxide;transition matel ions;sol-gel method;visible light
    Date: 2003-07-09
    Issue Date: 2009-09-21 12:22:06 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 二氧化鈦是一種具半導體性質的觸媒,利用紫外光照射可進行污染物的光催化分解反應,本研究以摻雜過渡金屬離子於二氧化鈦中減小二氧化鈦能隙,增加二氧化鈦對可見光的吸收能力,再利用波長為419nm的光源進行水楊酸的光催化分解反應。 利用溶膠凝膠法合成二氧化鈦,在水解反應過程中添加Cr3+、Fe3+與V4+等過渡金屬離子於二氧化鈦中,製備完成的鍍膜溶液為穩定懸浮狀態,經1~2個月的静置也不會沉澱,當鍛燒溫度為200℃時,二氧化鈦與摻雜過渡金屬離子之二氧化鈦的晶型主要為anatase,摻雜過渡金屬離子的二氧化鈦中,以摻雜釩離子對可見光的吸收能力最好。 利用浸漬鍍膜法將二氧化鈦鍍在玻璃基材上,以水楊酸水溶液進行可見光光催化分解反應,結果發現摻雜鉻、鐵離子的二氧化鈦可見光光催化效果,相較於二氧化鈦相當或稍高,摻雜釩離子的二氧化鈦光催化活性最弱,原因是釩離子最易進入到二氧化鈦晶格中,而過渡金屬離子進入到二氧化鈦會導致二氧化鈦結晶形成缺陷,使電子電洞在缺陷中再結合,因而降低光催化反應活性。 Abstract Titanium oxide is a semi-conducting photocatalyst. It can decompose the pollutants by irradiation of UV light. This study attempted to decrease the band-gap of TiO2 in order to improve the optical absorption properties in visible region. Photo-decomposition of salicylic acid under irradiation of visible light (419nm) was studied. Titanium oxide was synthesized by sol-gel method. The transition metal ions modified TiO2 were synthesized by adding transition metal ions Cr3+、Fe3+ and V4+ during the hydrolysis reaction of TiO2. The suspension of nanocrystalline TiO2 are stable after 1~2 months. The crystalline structures of TiO2 and modified TiO2 are anatase after annealing at 200℃. Titanium oxide modified with V4+ ions absorbs more visible light. Solutions containing titanium oxide were coated on glass by dip-coating method. The photo-decomposition activities of Cr3+ and Fe3+ modified TiO2 were similar to or higher than TiO2. The photo-decompo -sition activity is lowest over V4+ modified TiO2. The V4+ ions incorporated into TiO2 crystals may cause defects in TiO2 crystal and photo-decomposition activities decrease by recombination of electrons and holes at the defect sites.
    Appears in Collections:[化學工程與材料工程研究所] 博碩士論文

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