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研究生: 胡宏志
Hu, Hong-Zhi
論文名稱: 鈷在活性碳纖維中的吸附與鑑定
Adsorption and Characterization of Cobalt on Activated Carbon Fiber
指導教授: 何瑞文
Ho, Sun-Wen
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: 2002
畢業學年度: 90
語文別: 中文
論文頁數: 95
中文關鍵詞: 吸附活性碳纖維
外文關鍵詞: Adsorption, ACF, Cobalt
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  • 本篇所探討的主題是製備條件對活性碳纖維及所吸附鈷之物性和化性的影響。製備條件包括酸洗、溶劑、氧化等,鑑定技術包括TG-MS、Physisorption、SEM/EDX、ESCA等,並以程溫反應測試樣品催化N2O分解的活性。
    我們發現,酸洗使活性碳纖維的雜質量由2.65wt%降至0.68wt%,但未明顯的改變活性碳纖維表面積、孔洞體積和吸附鈷量。乙醇製備的樣品比起水製備的樣品具較高的吸附鈷量。在乙醇製備的樣品裡,鈷均勻地分佈在活性碳纖維內外;在水製備的樣品裡,鈷在活性碳纖維上的分佈為內少外多;在乙醇製備再經由水洗的樣品裡,鈷在活性碳纖維上的分佈為內多外少。孔洞分析儀的結果顯示,氧化造成重量及孔洞的損失,而鈷會使得在30Å附近的孔洞降的量較少。對N2O的催化分解,以乙醇製備的樣品具最佳活性。

    We study the effect of preparation conditions on physical and chemical properties on activated carbon fiber(ACF),and cobalt adsorbed on activated carbon fibers. The conditions include acid-wash, solvent and oxidation etc., Characterization techniques include TG-MS, SEM/EDX, Physisorption etc., we measure the activity of the sample that catalyze N2O decomposition as well.
    We found that acid-wash of ACF decrease the impurities from 2.65wt% to 0.68wt%, and activated carbon fiber’s surface area,pore volume and adsorption capacity for cobalt have insignificant change. The sample that prepared from ethanol has higher amount of adsorption for cobalt than the sample prepared from water.For the sample prepared from ethanol, cobalt distributed evenly on ACF; For the sample prepared from water, the outer part of activated carbon fiber have higher amount of cobalt than the inner part;For the sample prepared from ethanol but washed with water afterword, the inner part of ACF have higher amount of cobalt than the outer part. The results of Nitrogen adsorption isotherm reveal that oxidation cause loss of weight and pore volume, the presence of cobalt maintain the pore of ACF near 30Å. For N2O decomposition, the sample prepared from ethanol has the best activity.

    目錄 中文摘要……………………………………………………………….一 英文摘要……………………………………………………………….二 誌謝…………………………………………………………………….三 目錄…………………………………………………………………….四 表目錄………………………………………………………………….七 圖目錄………………………………………………………………….九 第一章 緒論……………………………………………………………1 1-1、前言………………………………………………………….1 1-2、文獻回顧…………………………………………………….2 1-2-1、碳纖維的發展…………………………………………2 1-2-2、活性碳纖維的發展……………………………………5 1-3、吸附理論…………………………………………………….6 1-3-1、吸附現象………………………………………………6 1-3-1-1、物理吸附………………………………………….7 1-3-1-2、化學吸附………………………………………….8 1-3-2、吸附模式……………………………………………….8 1-3-3、影響吸附的原因……………………………………….9 1-3-3-1、吸附劑特性………………………………….…….9 1-3-3-2、吸附質特性……………………………………….10 1-3-3-3、環境因子…………………………….……………11 1-3-4、粒狀活性碳及活性碳纖維特性比較…………………12 1-3-4-1、物化特性之差異…………………………………13 1-3-4-2、吸附模式的適用性…………………….……..….13 1-4、實驗動機…………………………………………………….16 1-5、實驗目的…………………………………………………….17 第二章 吸附鈷的ACF樣品製備…………………………….………..18 2-1、活性碳纖維的製成……………………………………….…18 2-2、樣品前處理………………………………………….……….22 2-2-1、樣品的篩選……………………………………..……..22 2-2-2、酸洗過程的制定………………………………………22 2-2-3、酸洗步驟………………………………………………23 2-3、樣品製備………………………………………………….…24 2-4、藥品………………………………………………………..….25 第三章 實驗設備………………………………………………………28 3-1、BET表面積與孔隙度………………………………………28 3-2、熱重分析儀-質譜儀(TGA-MS)………….………………….30 3-3、X光繞射儀(X-ray Diffraction Spectrometer)……………….32 3-4、掃描式電子顯微鏡/能量分散儀(SEM/EDS)………………..32 3-5、化學分析電子儀(ESCA or XPS)……………………………34 第四章 結果與討論……………………………………………..……..36 4-1、 熱重分析-質譜(TGA-MS)的分析…………………………36 4-1-1、熱重圖譜(TG)的分析……………………………..…..36 4-1-2、程溫氧化-質譜(TG-MS)的分析………………...……38 4-1-3、以熱重分析儀分析樣品…………………………...….44 4-2、X –ray繞射(XRD)實驗……………………………………..48 4-3、掃描式電子顯微鏡/能量分散儀SEM-EDS 分析………..…52 4-4、BET測表面積及孔洞體積實驗……………….……..….….60 4-5、在氦氣和1%N2O進行熱重-質譜的分析…………………..71 4-6、利用化學分析電子儀(ESCA)進行表面分析…….………….85 第五章 結論與展望…………………………………………………....87 第六章 參考論文………………………………………………………90

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