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研究生:楊舒皓
研究生(外文):Shu-Hao Yang
論文名稱:水熱法製備KTaO系列光觸媒粉末及其光催化活性與結構性質分析
論文名稱(外文):Photocatalysis Activity and structure Properties of KTaO Series Photocatalytic Powders Prepared by Hydrothermal Method
指導教授:張文固
指導教授(外文):Wen-Ku Chang
學位類別:碩士
校院名稱:國立東華大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:86
中文關鍵詞:氧化鉀鉭退火相變態水熱法光觸媒
外文關鍵詞:phase transformationpotassium tantalum oxidephotocatalytichydrothermal
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本實驗採用水熱法(Hydrothermal method)製備氧化鉀鉭光觸媒(KTaO series)。其結果顯示鉀離子在表面的殘留量會決定退火熱處理後的結果,如果光觸媒粉末的表面鉀離子殘留量較多的時候,則在退火熱處理達600℃之後水熱法所得到的產物,會由單相的K2Ta2O6相變態形成單相的KTaO3,但如果光觸媒粉末表面的鉀離子殘留量較少,或是沒有殘留的話,則在退火熱處理達800℃之後產物,會由單相的K2Ta2O6相變態形成以K2Ta4O11為主的相,倘若要得到前面的KTaO3相,就必須要提高退火溫度達900℃,隨著溫度提高,KTaO3生成的量會提升,訊號在XRD及UV-visible的結果中也會較明顯。
如果經由適當的熱處理,產生相變態而又能同時具有兩相者,其光催化活性在降解方面,都會比未退火熱處理的要好,唯一要注意退火溫度,是否會產生所需之兩相,以及避免因為溫度過高而造成晶粒成長使表面積降低,而影響到光催化活性;同樣可利用上述原理將兩單相混合並以低溫燒結,形成歐姆接觸來達到延緩電子-電洞對的再結合的效果,並提升光催化活性。
Potassium tantalum oxide photocatalyst powders were synthesized by hydrothermal method and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and UV-visible spectrometer. The photocatalytic activity was evaluated by photo-degradation methylene blue under UV-C light irradiation. Furthermore, study the properties of KTaO series photocatalyst powders by washed it before annealing or not, different temperature, different KOH concentration and annealing time and so on. The diffraction pattern will influenced by annealing temperatue of powder. The K2Ta4O11 crystal structure will be formed, if the powder is deficient the potassium ion in the surface and annealed to 700℃. The KTaO3 crystal structure will be formed at 900℃ and increased with the annealing temperature obviously. The KTaO3 single phase will be produced under sufficient potassium ion surrounding the powders surface.
The results revealed that the KTaO series photocatalyst powders will phase transformation from one phase to two phase under annealing reaction. The photocatalyst powders will be enhanced the photocatalytic activity under two phase coexist compared with one phase. In this research, the photocatalytic activity of powders will be strongly influence by the reaction annealing temperature. The high annealing temperature will induce the grain growth of photocatalyst and reduce the specific surface area.
第一章緒論.................1
第二章理論基礎與文獻回顧...9
第三章實驗方法與裝置......29
第四章結果與討論..........43
第五章結論................81
參考資料..................83
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