| 研究生: |
黃信彰 Huang, Sin-Jhang |
|---|---|
| 論文名稱: |
二甲基亞碸在二氧化鈦粉末表面上的吸附與反應 Adsorption and Reactions of Dimethylsulfoxide 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: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 中文 |
| 論文頁數: | 74 |
| 中文關鍵詞: | 二氧化鈦 、二甲基亞碸 、傅式轉換紅外光譜 、熱反應 、光化學 |
| 外文關鍵詞: | TiO2, dimethylsulfoxide, FT-IR, thermal reaction, photochemistry |
| 相關次數: | 點閱:105 下載:0 |
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本論文利用傅式轉換紅外光譜(FT-IR)研究二甲基亞碸(dimethyl sulfoxide,DMSO)在二氧化鈦粉末表面上的吸附與反應。DMSO在35 oC時,完整地以分子形態吸附於二氧化鈦表面上。在無氧環境下,DMSO熱分解產生CH3O(a)、HCOO(a)與S(a)的表面物種,其中甲氧基與甲酸根推測是由DMSO斷的碳-硫和碳-氫鍵以形成-OCH2O-這個短暫的反應中間體後再反應得到。有氧環境時,熱反應產物生成溫度與無氧下類似,皆有CH3O(a)和HCOO(a),這意謂著O2對於DMSO在TiO2上的熱分解途徑與動力學方面並沒有顯著的影響,但S(a)會進一步氧化成SO4(a)。DMSO/二氧化鈦在無氧存在下照光會生成CH3O(a)、HCOO(a)、H2O(a)與CH3S(a)產物,而有氧環境下則會光分解產生CH3O(a)、HCOO(a)、H2O(a)、CO2(g)與CH3SO3(a)。氧氣的存在可以促進DMSO的光分解。DMSO在二氧化鈦上的光反應可能是由電洞捕捉,促使DMSO失去氫原子,產生CH3S(O)CH2∙物種後再進一步反應生成產物。
Fourier-transform infrared spectroscopy has been employed to investigate the adsorption and reactions of dimethylsulfoxide (DMSO) on powdered TiO2. DMSO is adsorbed molecularly on TiO2 surface at 35 oC. DMSO on TiO2 is subjected to thermal decomposition, producing the surface species of CH3O, HCOO and S under vacuum. The formation of CH3O and HCOO is likely originated from the transient reaction intermediate of -OCH2O-, which is formed by dissociating both the C-S and C-H bonds of DMSO. In the presence of O2, the thermal reaction products and rate are similar to those under vacuum, generating CH3O and HCOO. This indicates that O2 has negligible effect on the thermal decomposition pathway and kinetics of DMSO, but oxidizes the reaction product of S(a) to SO4(a). Photodegradation of DMSO on TiO2 generates CH3O(a), HCOO(a), H2O(a) and CH3S(a) in the absence of O2. In the case of DMSO photoreaction in the presence of O2, CH3O(a), HCOO(a), H2O(a), CO2(g) and CH3SO3(a) are formed. O2 can enhance the photodegradation of DMSO. The photochemistry is proposed to proceed primarily by H abstraction from DMSO, followed by decomposition of the CH3S(O)CH2∙ species.
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校內:2017-08-03公開