| DC 欄位 |
值 |
語言 |
| DC.contributor | 化學工程與材料工程學系 | zh_TW |
| DC.creator | 張仕正 | zh_TW |
| DC.creator | Shin-Cheng Chang | en_US |
| dc.date.accessioned | 2003-7-18T07:39:07Z | |
| dc.date.available | 2003-7-18T07:39:07Z | |
| dc.date.issued | 2003 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=90324021 | |
| dc.contributor.department | 化學工程與材料工程學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.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。 | zh_TW |
| dc.description.abstract | 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. | en_US |
| DC.subject | 可見光光催化 | zh_TW |
| DC.subject | 二氧化鈦 | zh_TW |
| DC.subject | 溶膠凝膠法 | zh_TW |
| DC.subject | 過渡金屬離子 | zh_TW |
| DC.subject | photocatalysis | en_US |
| DC.subject | titanium oxide | en_US |
| DC.subject | transition matel ions | en_US |
| DC.subject | sol-gel method | en_US |
| DC.subject | visible light | en_US |
| DC.title | 在二氧化鈦上進行Salicylic acid可見光
光催化反應的研究 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |