- 期刊
製備條件對兩種國產竹活性碳基本性質之影響
Effects of the Preparation Conditions on Basic Properties of Activated Carbon from Two Bamboos Grown in Taiwan
摘要
本研究係分別將孟宗竹及刺竹之下、中、上桿之竹材打成粒片並取篩分20-40mesh之試料，經550℃炭化，然後再分別以700、750及800℃之水蒸氣活化，製備成活性碳，藉以探討不同竹材部位、活化溫度對活性碳收率、BET比表面積、孔隙大小、BJH中孔孔徑之影響。結果顯示，兩種竹材製備之活性碳其收率、BET比表面積、BJH中孔孔徑皆因活化溫度不同而呈顯著差異，但與竹桿取材部位無顯著相關性；其BJH中孔孔徑分佈，刺竹較孟宗竹更佳，因此在處理液相吸附污染物時，可考慮選用刺竹活性碳。pH值均偏向鹼性，刺竹較孟宗竹高，其碘值與亞甲基藍吸附值皆與活化溫度及竹桿取材部位呈顯著相關性。又知，兩種竹材經炭化、活化後之吸附曲線屬於TypeⅠ型為屬藍牟爾（Langmuir）吸附，具有以微孔為主之物質，其說明兩種竹材經炭化即有微孔產生。
並列摘要
Bamboos collected from the top, middle, and base sections of Moso bamboo (Phyllostachys pubescens) and Thorny bamboos (Bambusa blumeana) were ground to powder, and then sieved through a 20-40 mesh. Charcoalization was performed at 550 °C and steam-activation was performed at 700, 750, and 800 °C, respectively. We examined the effects of different sections of bamboo and the activation temperatures to the yields, Brunauer-Emmett-Teller (BET) surface areas, pore sizes, pore volumes, and Barrett-Joyner-Halenda (BJH) mesopores sizes. The results showed that there were positive linear relationships between the activation temperatures with the yields, BET surfaces and BJH mesopores pore diameters. However, samples from different sections of bamboos did not show any significant relationship. The BJH mesopores distributions of activated carbon from Thorny bamboo were better than that from Moso bamboo, thus, activated carbons made from Thorny bamboo is a better choice in liquid absorption of pollutants. There were positive linear relationships of iodine and methylene blue values with activation temperatures and sections, and the micropores of Moso and Thorny bamboo after charcoalization were obtained. The average pore sizes of both activated carbon belong to the Langmuir absorption curve. The activated carbon made with ground bamboo powder showed better BET surface area, pore volume, and BJH mesopores than that made from traditional method. Both types of bamboos are candidates for carbon materials.
延伸閱讀
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