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題 名 | 預炭化及接續木灰-水蒸氣複合活化製備柳杉活性碳之研究=Preparation of Japanese Cedar (Cryptomeria japonica) Activated Carbon Using Precarbonization, Subsequent Wood Ash and Steam Activation |
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作 者 | 彭嘉文; 胡智翔; 林翰謙; | 書刊名 | 國立臺灣大學生物資源暨農學院實驗林研究報告 |
卷 期 | 27:2=280 2013.06[民102.06] |
頁 次 | 頁95-110 |
分類號 | 436.1 |
關鍵詞 | 預炭化; 木灰; 水蒸氣; 複合活化; 活性碳; Precarbonization; Wood ash; Steam; Combining activation; Activated carbon; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係將先驅物柳杉經預炭化後,接續木灰-水蒸氣複合活化製備柳杉活性碳,以探討其經預炭化(預炭化溫度200、300、400、500℃)及活化溫度(550、650、750℃)等條件對製備活性碳之收率、碘值、BET比表面積且孔隙特性等影響。活性碳收率介於9.1-21.3%,碘值為502.4-1171.1mg/g間。以預炭化溫度200℃、灰/水比0.25 wt.%、活化溫度750℃、水蒸氣流量0.5mL/min及活化時間1 h等製備條件下,可製備出較高之收率14.9%、較大之比表面積(S_B)1619m^2/g與較高之外部表面積(Sex)940m^2/g且呈粒狀之其中孔孔隙特性之活性碳,其孔隙結構主要由多數中孔且微孔所組成(微孔體積比例Vmi/Vtot為36.0%),又其S_B、Sex及總孔隙體積(Vtot)皆較以木灰及水蒸氣複合活化者(未經預炭化)高出約1.3、1.7與1.3倍,另僅以化學活化劑碳酸鉀(K_2CO_3)製備出粉末狀柳杉活性碳者之S_B(1537m^2/g)亦較本研究者低。上述結果可知,本研究所製備之活性碳因具有高比表面積且具多中孔之特性等,因而可應用在諸如液相污染或相關工業上之吸附材料。 |
英文摘要 | In this study, the Japanese cedar (Cryptomeria japonica ) activated carbon (AC) was prepared using precarbonization and subsequent combined activation with Japanese cedar ash and steam. Japanese cedar was used as a precursor for preparing AC at various precarbonization temperatures (200, 300, 400, and 500℃) and activation temperatures (550, 650, and 750℃). The estimates of precarbonization and activation temperatures on the prepared AC were investigated including yield, iodine number, BET specific surface area (S_B), and porosity characteristics. The yield and iodine number of AC were in the range of 9.1%-21.3% and 502.4-1171.1 mg/g, respectively. In the condition of precarbonization temperature at 200����, ash to water ratio at 0.25 wt.%, an activation temperature at 750℃ , a steam flow at 0.5 mL/min, and activation duration at 1 h, it exhibited a higher yield of 14.9%, a higher S_B of 1619 m^2/g, and a greater external surface area (Sex) of 940 m^2/g. Additionally the results showed that granulated particles exhibiting mesoporosity, and the pore structure was primarily dominated by mesoporous and a few of microporous. Moreover, S_B, S ex, and the total pore volume (Vtot) of the AC prepared using precarbonization were 1.3, 1.7, and 1.3 times higher than the subjects prepared without using precarbonization. The powdered AC prepared from Japanese cedar by using chemical activation with potassium carbonate (K_2CO_3) revealed a lower S_B of 1537 m^2/g compared with that of the AC prepared using than precarbonization and steam. Therefore, the prepared AC characterized high surface area and mesoporosity that could be a promising adsorbent material for liquid-phase pollution or industrial applications. |
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