| 研究生: |
賴柏志 Lai, Po-Chih |
|---|---|
| 論文名稱: |
異丙醇頻哪醇硼酸酯在二氧化鈦粉末表面上的吸附與反應 Adsorption and Reactions of 2-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane on Powdered TiO2 |
| 指導教授: |
林榮良
Lin, Jong-liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2014 |
| 畢業學年度: | 102 |
| 語文別: | 中文 |
| 論文頁數: | 88 |
| 中文關鍵詞: | 二氧化鈦 、異丙醇頻哪醇硼酸酯 、傅式轉換紅外光譜 、光催化 |
| 外文關鍵詞: | TiO2, ITDB, Fourier-Transform Infrared Spectrometer, Photocatalyst |
| 相關次數: | 點閱:82 下載:1 |
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本論文利用傅式轉換紅外光譜儀(FT-IR) 研究異丙醇頻哪醇硼酸酯(2-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane,ITDB)在二氧化鈦粉末表面上的吸附與反應。ITDB在35 oC時會以分子型態吸附於二氧化鈦表面上。在真空環境下,ITDB分子會熱分解為環氧硼分子以及異丙醇基分子,隨著溫度的上升進一步分解為硼氧化物吸附於表面。在有氧環境下,異丙醇基分子會氧化產生甲酸根、乙酸根以及CO2,而同位素實驗則可證實O2確實參與了反應,而非異丙醇基分子和二氧化鈦表面之氧原子進行反應。ITDB/TiO2在真空加熱反應後顏色出現了變化,將粉末刮下後進行的性質檢測也證實可進行可見光降解;ITDB/TiO2 進行有氧照光反應後,整體結構並無明顯變化,僅CO2、C=O及CO32-生成。而ITDB/SiO2,並不會產生反應。
Fourier-transform infrared spectroscopy has been employed to investigate the adsorption and reactions of 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (ITDB) on powdered TiO2. ITDB is adsorbed molecularly on TiO2 surface at 35 oC, but it is subjected to thermal decomposition, producing adsorbed C3H7O and surface-bonded borate ester which decomposes into boron oxide at high temperatures under vacuum. In the presence of O2, HCOO-、CH3COO-、CO2 are generated thermally by the oxidation of isopropoxy. O2 participates in the formation of these products, which is confirmed by using 18O2. A significant color change of the TiO2, from white to brown was found after heating ITDB/TiO2 to 400 oC in vacuum. X-ray photoelectron spectroscopy shows that the B and C are left on TiO2, which exhibit visible-light sensitive photocatalytic activity of methylene blue degradation. In the ITDB/TiO2 photoreaction in the presence of O2, CO2、C=O and CO32- are formed. However, there is no reaction for ITDB/SiO2 under UV-light irradiation.
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