頁籤選單縮合
題 名 | 銀合歡木灰及水蒸氣複合活化製備柳杉活性碳之研究=Study of Japanese Cedar Activated Carbon by Combining Activation with White Popinac (Leucaena leucocephala) Ash and Steam |
---|---|
作 者 | 彭嘉文; 王亞男; 呂佳樺; 莊閔傑; 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 | 26:2=276 2012.06[民101.06] |
頁 次 | 頁125-140 |
分類號 | 474.9 |
關鍵詞 | 銀合歡木灰; 水蒸氣; 複合活化; 柳杉; 活性碳; White popinac ash; Steam; Combining activation; Japanese cedar; Activated carbon; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以銀合歡(”Leucaena leucocephala”)木灰及水蒸氣複合活化製備柳杉活性碳,探討先驅物柳杉經銀合歡木灰(灰/水比0.20、0.25、0.33 wt.%)、活化溫度(650、750、850、950°C)及水蒸氣流量(0.5、1.0、1.5 mL/min)等條件對製備活性碳收率、碘值、亞甲基藍吸附值、BET比表面積及孔隙特性之影響。經銀合歡木灰及接續水蒸氣複合活化之柳杉活性碳收率介於14.7-23.4%,其碘值及亞甲基藍吸附值分別介於887.2-1041.5 mg/g及658.7-1100.9 mg/g,且隨著灰/水比、活化溫度及水蒸氣流量的提高,所製備活性碳之BET比表面積及總孔隙體積均隨之增加,其中以灰/水比0.33 wt.%、活化溫度750°C及水蒸氣流量1.5 mL/min之條件,可製備最高比表面積(S_B)1148 m^2/g、外部表面積(Sex)364 m^2/g及總孔隙體積(Vtot)0.57 cm^3/g之柳杉活性碳,其孔隙結構主要由微孔及中孔所組成之狹縫狀孔洞,又其較僅以銀合歡木灰或水蒸氣之單一活化製備柳杉活性碳者為佳,其S_B、Sex及Vtot較以銀合歡木灰活化者高出約1.1、1.4與1.1倍,更高出以水蒸氣活化者約1.7、4.2與1.7倍,且製備所需活化溫度(750°C)較先前報告僅以木灰活化結果者(950°C)為低。 |
英文摘要 | Japanese cedar (”Cryptomeria japonica”) activated carbons were prepared by combining activation with White popinac (”Leucaena leucocephala”) ash and steam. Japanese cedar as the precursor was prepared with White popinac ash at different levels of ash/water ratio (0.20, 0.25 and 0.33 wt.%), activation temperature (650, 750, 850 and 950°C), and steam flow (0.5, 1.0 and 1.5 mL/min). The activated carbon (AC) yield, iodine number, amount of methylene blue adsorption, BET specific surface area and porosity characteristics of AC were investigated. The yields of AC with White popinac ash and steam by combining activation were from 14.7 to 23.4%. The iodine number was between 887.2 and 1041.5 mg/g, and the amount of methylene blue adsorption was between 658.7 and 1100.9 mg/g. The increasing ash/water ratio, the activation temperature and the steam flow, BET specific surface area and the total pore volume of AC become higher. The Japanese cedar AC with ash/water ratio of 0.33 wt.%, activation temperature of 750°C and steam flow of 1.5 mL/min had the highest BET specific surface area (S_B) of 1148 m^2/g, the external surface area (S ex) of 364 m^2/g and the total pore volume (Vtot) of 0.57 cm^3/g. Additionally, the pore structure is dominated by micro- and mesoporous consisting of slit-shaped pores. The AC prepared by White popinac ash and steam activation is better than that only by either White popinac ash or by steam activation. The S_B, S ex and Vtot by combining activation method are 1.1, 1.4, 1.1 times higher than that only by White popinac ash, and 1.7, 4.2 and 1.7 times than that only by steam activation. Moreover, the activation temperature for preparing is only 750°C. It is lower than that only using White popinac ash with 950°C in the previous study. |
本系統中英文摘要資訊取自各篇刊載內容。