椰殼活性碳之製備及其吸附特性之研究

本研究選取椰殼作為製備活性碳之原料，將氣乾過之椰殼裁切成適當尺寸放入高溫爐活化，製作高品質活性碳之樣品，製程參數包含碳化溫度、活化溫度、持溫時間和粒徑大小，碳化溫度都以固定溫度600 ℃，而活化溫度有600 ℃、700 ℃、800 ℃、900 ℃及1000 ℃等五種不同溫度，持溫時間有60 min、120min等兩種不同時間。研究中探討活性碳炭收率、灰分、酸鹼值、粒徑、BET 比表面積、各孔隙比表面積及碘值吸附等基本性質，並且探討椰殼活性碳對二氧化碳吸附能力機能性之應用，並與活性碳材料做吸附值比較，以期達到碳質多孔性材料之新用途使用目標。在實驗方面先將椰殼秤重活化後測量其碳收率，隨後研磨之適當的粒徑再將碳粉放入自製儀器中以每五分鐘吸附二氧化碳，吸附過後使用氣相層析儀分析二氧化碳濃度變化，配合BET比表面積檢測證實其吸附效能。使用SEM儀器觀察孔隙變化，記錄探討其活性碳最佳之吸附能力與參數之間的關係。

關鍵字

椰殼；活性碳；吸附；二氧化碳

並列摘要

This study adopted coconut shell as a raw material of activated carbon. The air-dried coconut shell was sliced into appropriate sizes and carbonized in high-temperature kiln for preparing high quality activated carbon (AC). The processing parameters include carbonization temperature, activation temperature, retention time, and powder sizes. The carbonization temperature is fixed at 600 °C. Five activation temperatures, i.e., 600, 700, 800, 900, and 1000 °C and two retention times, i.e., 60 and 120 min, were used for comparison. In order to understand the adsorption characteristics of porous charcoal, its fundamental properties, namely charcoal yield, ash content, pH value, Brunauer-Emmett-Teller (BET) surface area, iodine number, and pore volume, were analyzed. Functional applications of coconut shell activated carbon (CSAC) were discussed. The carbon dioxide (CO2) adsorption capacity of CSAC was compared with that of commercial available AC in order to identify its potential applications. In experiments, the charcoal yield of coconut shell was firstly measured after carbonization and activation. The carbonized coconut shell was then ground into a desired powder size using a mechanical grinder. To measure the CO2 adsorption capacity, the CSAC powder was placed into a stainless steel barrel to progress the adsorption test. Gas chromatography (GC) was used to measure the changes of CO2 concentration inside the barrel and the channel. The measurement of BET surface area is used to verify the adsorption performance of AC. Scanning electron microscopy (SEM) was used to analyze the micro-porous structure changes and to obtain the relationship between adsorption performance and processing parameters.

並列關鍵字

Coconut shell ； activated carbon ； adsorption ； carbon dioxide

參考文獻

[2] J. D. Figueroa et al, Advances in CO2 Capture Technology-The U.S. Department of Energy's Carbon Sequestration Program, International Journal of Greenhouse Gas Control, 2, 2008, 9-20.

[3] K. Gergova , S. Eser, Effects of activation method on the pore structure of activated carbons from apricot stones, Carbon, 34, 1996, 879-888.

[5] H. Teng, S. C. Wang, Preparation of porous carbons from phenol formaldehyde resins with chemical and physical activation, Carbon, 38, 2000, 817-824.

[6] S. J. Park, K. D. Kim, Influence of activation temperature on adsorption characteristics of activated carbon fiber composites, Carbon, 39, 2001, 1741-1746.

[7] I. Abe. et al, Preparation of carbonaceous adsorbents for removal of chloroform from drinking water, Carbon, 39, 2001, 1069-1073.

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椰殼活性碳之製備及其吸附特性之研究

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