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研究生:何定晏
研究生(外文):Ting-yen Ho
論文名稱:相思木以ZnCl2活化法製備高比表面積活性碳及其應用
論文名稱(外文):Preparation of High Surface Area Activated Carbons from Acacia confusa by ZnCl2Activation and its application
指導教授:吳豐智
學位類別:碩士
校院名稱:國立聯合大學
系所名稱:化學工程學系碩士班
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2009/08/
畢業學年度:97
語文別:中文
論文頁數:88
中文關鍵詞:相思木ZnCl2活化法吸附活性碳
外文關鍵詞:Acacia confusaZnCl2 activationAdsorptionActivated carbon
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本研究以相思木 (Acacia confusa)為原料,以ZnCl2活化法製備活性碳,分別為變化活化溫度和不同ZnCl2濃度兩系列,並進行活性碳之物理性質、化學性質和吸附實驗。在ZnCl2濃度比1.75,活化溫度500℃,恆溫1小時(ZAC175500)獲得高比表面積2,009 m2/g和高產率38.8%之活性碳。以熱重分析、元素分析和程溫脫附瞭解活性碳之灰份、元素組成與表面含氧官能基。對染料(MB、AB74、BBY)及4-CP進行吸附研究,吸附動力學以Elovich 式和顆粒內部擴散模式解析,以Elovich 式謀合性較佳。等溫平衡吸附以Langmuir和Freundlich等溫平衡式解析,以Langmuir等溫平衡式謀合性較佳,其中ZAC175500吸附MB、AB74、BBY和4-CP之qmon值分別為494、366、439和410 g kg-1,對染料與酚類皆有良好的吸附能力。證實本研究製備之高比表面積活性碳,有良好吸附特性和較高產率,具有開發之價值。
Activated carbon was prepared from Acacia confusa by ZnCl2-activation in this work. Two carbon series were prepared with different activated temperature (400, 450, 500, and 550℃) at ZnCl2/raw material ratio 1.75, and ZnCl2/raw material ratio (0.75, 1.25, 1.75, and 2.25) at 500℃. It was obtained that activated carbon derived from ZnCl2/raw material ratio 1.75 (at 500℃, 1h), has the highest BET surface area of 2,009 m2/g and 38.8% of yield. Physical properties of activated carbon include specific surface area and pore volume measured by the method of N2 adsorption/desorption at 77K, and the scanning electron microscope (SEM) observation as well as the chemical properties, namely elemental analysis and temperature programmed desorption (TPD), and thermo gravimetric analysis (TGA) were measured. The adsorption kinetics and equilibrium isotherms of dyes (Methylene blue, Acid blue 74, Bismarck brown Y) and 4-chlorophenol from water at 30℃ on the activated carbons were studied. Two simplified models including the Elovich equation and intraparticle diffusion model were used to test the adsorption kinetic; it was suitably described by the Elovich equation. Two simplified models including the Langmuir and Freundlich isotherm equation were selected to follow the adsorption process; the adsorption equilibrium isotherm was in agreement with the Langmuir equation. The monolayer coverage (qmon) of MB, AB74, BBY, and 4-CP for ZAC175500 activated carbon of 494, 366, 439, and 410 g/kg, respectively; it revealed their good adsorption capability for dyes and 4-CP. This study proved that activated carbon prepared in this work had high BET surface area, high yield and good adsorption capability, had application potential.
摘 要 I
Abstract II
目錄 III
圖目錄 VI
表目錄 IX
符號說明 XI
第一章 前言 1
1.1 研究緣起與目的 1
1.2 研究內容 2
第二章 文獻回顧 4
2.1 活性碳的原料 4
2.2 活性碳的製備 5
2.3 影響活性碳活化之因素 10
2.4 等溫吸附平衡 12
2.5 吸附動力學 16
2.6 活性碳之物化性質分析 18
2.6.1 熱重分析(TGA) 18
2.6.2 程溫脫附 19
第三章 實驗方法 21
3.1 實驗儀器與藥品 22
3.2 實驗步驟 24
3.2.1 原料前處理 24
3.2.2 活性碳製備 24
3.3 活性碳之物理化學性質 26
3.3.1 孔隙特性 26
3.3.2 掃描式電子顯微鏡(SEM) 26
3.4.3 熱重分析(Thermo gravimetric analysis;TGA) 27
3.3.4 元素分析 (Elemental analysis;EA) 27
3.3.5 程溫脫附 (Temperature Programmed Desorption;TPD) 28
3.4 吸附實驗 28
3.4.1 吸附動力學 28
3.4.2 吸附等溫平衡 29
第四章 結果與討論 32
4.1 活性碳物理性質 32
4.1.1 活性碳之孔隙結構 32
4.1.1.3 製備活性碳之最適條件 40
4.1.2 SEM量測 46
4.2 活性碳化學性質 50
4.2.1 元素分析 50
4.2.2 程溫脫附 55
4.2.2.1 不同活化溫度製備活性碳之程溫脫附 55
4.2.2.2 不同ZnCl2濃度製備活性碳之程溫脫附 57
4.2.3 熱重分析 58
4.2.3.1 原料之熱重分析 58
4.2.3.2 不同活化溫度製備活性碳之熱重分析 60
4.2.3.2 不同ZnCl2濃度製備活性碳之熱重分析 61
4.3 活性碳吸附 62
4.3.1 吸附動力學 62
4.3.1.1 不同活化溫度製備活性碳吸附動力學 63
4.3.1.2 不同ZnCl2濃度製備活性碳吸附動力學 69
4.3.1.3 不同條件製備活性碳對各吸附質之吸附動力學比較 76
4.3.2 吸附之等溫吸附 78
4.3.2.1 不同活化溫度製備活性碳等溫吸附 78
4.3.2.2 不同ZnCl2濃度製備活性碳等溫吸附 82
4.3.2.3 不同條件製備活性碳對各吸附質之等溫吸附比較 85

第五章 結論與建議 87
5.1 結論 87
5.2 建議 88
參考文獻 89
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