臺灣博碩士論文加值系統

五氧化二鉭之應用相當廣泛，涵蓋觸媒、固態氧化物燃料電池和感測器，吸收紫外線後會產生光觸媒效應進而水解產生氫能源，若是能提高光催化效率，相信對各項新能源產業能有相當程度的幫助。而介孔材料相較於一般奈米材料，具有尺寸大小均勻、比表面積大的特性，可使得材料的性質大為提升，因此近年來已成為重要的研究課題。
本研究利用三嵌段兩性共聚物作為介孔五氧化二鉭之天然模板，以溶膠-凝膠法製備介孔五氧化二鉭，實驗中添加不同比例三嵌段兩性共聚物，藉以了解其添加量對產物的影響，同時探討添加不同重量百分比濃度之硝酸鎳對介孔五氧化二鉭結構的影響。以X-ray繞射分析、小角度散射分析、穿透式電子顯微鏡及氮氣吸附/脫附曲線分析五氧化二鉭之結構與比表面積。實驗結果顯示，使用1.0~2.0 g 三嵌段兩性共聚物經煆燒溫度 700 ºC以上，由XRD分析結果可獲得五氧化二鉭之斜方晶結構。當添加 1.0 g 三嵌段兩性共聚物及煆燒溫度600 ºC時，藉由TEM分析可觀察到蟲狀的孔洞結構，經由氮氣吸附/脫附曲線分析，可得知粉末之比表面積約為 51.54 m2/g 、平均孔徑約為 49.19 Å。添加硝酸鎳2 wt%時，煆燒溫度500 ºC時，亦為蟲狀的孔洞結構，比表面積為94.97 m2/g，平均孔徑大小為 44.20 Å。添加硝酸鎳6 wt%時在600 ℃時發現有五氧化二鉭結晶相，說明適當添加硝酸鎳對於結晶溫度影響很大。

Ta2O5 finds its promising application in catalysis, solid oxides fuel cells and sensors. After absorbing the ultraviolet ray, it has the light catalyst effect and further resulting in hydrolysis to producing the hydrogen energy. Many applications would benefit from the enhancement of the chemical reaction of Ta2O5. Mesostructured material due to its tailored pore structures and high surface area, thus improving the effectiveness of the material has attracted increasing attentions in recent years.
Mesoporous Ta2O5 are obtained by the sol-gel process with the block copolymer as a natural template and Ni(NO3)2．6H2O as an inorganic precursor. In this work, we changed the precursors, with different ratios of block copolymer additives, to study their effect on the crystallinity, as well as the effect on the structure of Ta2O5 at various calcining temperatures. XRD, TEM, SAXS and N2 absorption-desorption isotherms were used to characterize the structure and the specific surface area of the samples.Our experiments demonstrated that Mesoporous Ta2O5 obtained by using 1.0~2.0g block copolymer with a temperature 700 ºC , expressed the orthorhombic structure . It had a surface area of 51.54 m2/g , and the average pore diameter was 49.19 Å.When increases block copolymer 1.0 g and temperature 600 ºC, because of the TEM analysis may observe the insect shape the hole structure，by N2 absorption-desorption isotherms May know the powder. Adding 2 wt％ Ni(NO3)2．6H2O with the calcination temperature of 500 ℃, the mesoporous Ta2O5 had a much higher specific surface area of 94.97 m2/g, and an average pore size of 44.20 Å.Increasing to 6 wt% Ni(NO3)2．6H2O with 600 ℃ the mesoporous Ta2O5 expressed the crystallization phase, which indicated that the appropriate increase of Ni(NO3)2．6H2O largely affects the crystallizing point.

目錄

摘要 I
Abstract II
謝誌 IV
目錄 V
表目錄 VII
圖目錄 VIII
第一章 緒論 1
1.1前言 1
1.2孔洞材料簡介 1
1.3 研究動機及目的 4
第二章 理論基礎與文獻回顧 5
2.1 界面活性劑性質簡介 5
2.1.1 界面活性劑分類 5
2.2 微胞理論 9
2.3 界面活性劑分子聚集體之結構 11
2.4 介孔材料之合成與分析 14
2.4.1 介孔材料的合成 14
2.4.2 介孔材料之孔洞及比表面積分析 18
2.5 五氧化二鉭結構特性 20
2.6 五氧化二鉭之製備方法 20
2.7 溶膠-凝膠法 20
第三章 實驗方法與步驟 23
3.1 化學藥品 23
3.2 五氧化二鉭合成步驟 23
3.3 五氧化二鉭製程參數 25
3.4 材料分析 25
第四章 結果與討論 29
4.1 介孔五氧化二鉭之合成 29
4.1.1 XRD分析 29
4.1.2 SAXS分析 30
4.1.3 TEM分析 33
4.1.4氮氣吸附/脫附曲線分析 33
4.2 添加硝酸鎳和改變煆燒溫度對介孔五氧化二鉭之影響 40
4.2.1 XRD分析 40
4.2.2 TEM分析 42
4.2.3氮氣吸附/脫附曲線分析 42
第五章 結論 49
參考文獻 50
作者簡介 53

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