請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5728
標題: 以電漿輔助沉積法複合 奈米碳管/二氧化鈦材料光降解氣相丙酮之研究
Photocatalytic-degradation of acetone vapor with CNT/TiO2 nanocomposites fabricated by APPENS
作者: 曾婉婷
Zeng, Wan-Ting
關鍵字: nanocomposites
出版社: 環境工程學系所
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摘要: 本研究目的以常溫常壓電漿輔助化學氣相沉積法(APPENS, atmospheric pressure plasma enhanced chemical vapor deposition)製備CNT/TiO2奈米複合材料,並尋找最佳製備條件,針對丙酮進行觸媒催化分解處理技術應用之潛能。研究利用電壓為12、13、15kV製備CNT/TiO2,將CNT/TiO2的CNTs含量在控制30%條件下進行光降解實驗,反應速率常數分別為0.86、0.60、0.42 (min-1 g-1)。經X光繞射分析顯示,CNT/TiO2主要晶相為銳鈦礦結構,且粒徑約介於18-25nm之間。由SEM圖中發現,CNT/TiO2中TiO2顆粒粒徑與XRD求出的粒徑相符,並且均勻分布於CNTs管壁上。以12kV製備不同CNTs含量的CNT/TiO2,10%-CNT/TiO2的反應速率為1.20min-1 g-1,為最佳之CNTs含量。本研究所製備的CNT/TiO2與商用光觸媒P25及sol-gel法比較,其去除能力佳,且10%-CNT/TiO2的反應速率約為P25的兩倍。不同環境溫度比較之下,反應速率常數隨溫度增加,由連續式實驗所求得之丙酮轉化率亦有相同趨勢。針對不同濕度測試結果,增加環境濕度,反應速率常數與丙酮轉化率有降低的趨勢。綜合上述結果,降低電漿電壓、將CNTs含量控制在10%、且增加環境溫度可增加CNT/TiO2光降解丙酮的效率,而實驗證實結合CNTs與TiO2能提昇去除效率及光降解丙酮的反應速率。
CNT/TiO2 nanocomposites were prepared by atmospheric pressure plasma enhanced chemical vapor deposition (APPENS) to study photo-degradation of Acetone vapor. With different plasma voltages of 12, 13 and 15 kV, the rate constants of Acetone degradation are 0.86, 0.60 and 0.42 (min-1 g-1), respectively. It's shown that a decrease in the voltage results in an increase of the rate constant. The X-ray analysis shows that the TiO2 on CNTs surface is anatase, and in further comparison with the scanning electron micrographs reveals nanoparticle size ranging from 18 to 25 nm. Use of 12kV plasma voltage can obtain smaller particles, so the rate constant is better. Preparing different CNTs content, 0, 10, 20, 30%-CNT/TiO2, the 10%-CNT/TiO2 rate constant reached 1.20min-1 g-1. Compare to the P25 and the sol-gel method composite, the rate constant is higher than in both cases by 2 and 1.5 times. This indicates that CNTs can promote the removal efficiency significantly. For the temperature effect results, the photo-degradation rate constant increases with temperature. And for the continuously experiment, which have same trend with the bath experiment via temperature and relative humidity.
URI: http://hdl.handle.net/11455/5728
其他識別: U0005-0408201015233600
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0408201015233600


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