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標題: 多壁奈米碳管結合光觸媒之複合材料去除氣相丙酮污染物之研究
A study on Removal of acetone vapors from air streams by CNTs/TiO2 nanocomposites
作者: 蔡逸傑
Tsai, Yi-Jie
關鍵字: nanocomposites;奈米複合材料;TiO2;CNTs;photo degradation;adsorption;光觸媒;奈米碳管;鍛燒溫度
出版社: 環境工程學系所
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本研究之主要目的為瞭解商用多壁奈米碳管結合TiO2光觸媒之複合材料於空氣污染物(Acetone)吸附及光降解處理技術應用上之潛能。本實驗將分別製備多壁奈米碳管含量為0~40%之CNTs/TiO2奈米複合材料,並進行XRD、BET、TGA、TEM、Raman等特性分析並討論其中之特性差異,並且進行等溫吸附實驗及光降解實驗,討論其吸附及光解效率,實驗結果顯示由高解析穿透式電子顯微鏡(HRTEM)所得之影像可直接觀察得,10%以上CNTs比例之複合材料二氧化鈦可較均勻的分散於多壁奈米碳管上,其粒徑大小約為10~20nm;由總比表面積分析儀(BET)可得,原始多壁奈米碳管之比表面積及總孔洞體積分別約為393 m2 g-1 及0.9086 cm3 g-1,研究中發現經過增加多壁奈米碳管於複合材料中之比例可提升複合材料之比表面積與孔隙體積。由拉曼光譜分析可看出多壁奈米碳管之G-band位於1565cm-1,而隨者CNTs比例漸少G-band 有向右偏移之趨勢;由TGA結果顯示奈米碳管約在500℃時開始出現重量損失,且其在750℃鍛燒後之殘餘重量比約為5%;並進行等溫吸附和光降解之實驗,等溫吸附實驗顯示複合材料中添加CNTs可有效增加複合材料之吸附能力,而由光降解實驗得知多壁奈米碳管含量為10%之複合材料能兼備吸附和光降解之效能,並發現其光催化速率優於10%含量之單壁奈米碳管、沸石、活性碳之複合材料,且在直接光催化實驗中,複合材料有較優於純TiO2知去除效率。而在25℃有較佳的光催化效率,而其光催化速率常數會隨著相對溼度的增加而下降。

In this study student try to combine the advantage of CNTs and TiO2 by sol-gel method.And to study the characterization properties of nanocomposites with various CNTs containing ratios of 0~40%. From the transmission electron microscopy (TEM) images displayed that the TiO2 particles were uniformly coated on the CNTs surface and the CNTs appear in the composite can make the TiO2 particles well disperse. The BET result shows that the CNTs contain can efficiently increase the surface aera and pore volum of composite. The X-ray diffraction (XRD) analysis showed that the TiO2 on CNTs surface was anatase crystallize phase. From the Ramam result the D band of CNTs in the composite shift to right side with the MWCNT contained ratio decreasing and the ID/IG ratio increasing with MWCNT contained ratio decreasing. The TGA resule shows that the gasification temperature of CNTs is about 500℃ that prove the CNTs is suitable supporter for composite. And the 10% CNTs containing nanocomposites show the best performance for degrading acetone vapor from air streams, and its photo degradation rate constant is better than 10% SWCNTs、PAC、Zeolite containing composites. And the removal efficiency about opening the UV light at beging of 10% CNTs containing nanocomposites is better than pure TiO2.And at 25℃ can get the best degradation rate constant. From the humidity effect experiment result, the degradation rate constant decreasing with increasing the relate humidity.
其他識別: U0005-2906200717202800
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