氯化鋅活化法製備麻竹活性碳孔隙性質之探討

The Preparation and Pore Characterization of Activated Carbon from Ma Bamboo (Dendrocalamus latiflorus) by ZnCl_2 Chemical Activation

劉素玲(Su-Ling Liu) ； 盧崑宗(Kun-Tsung Lu)

《林產工業》 32卷3期 (2013/09) Pp. 147-154

https://doi.org/10.6561/FPI.2013.32(3).3

摘要

本研究選用麻竹（Dendrocalamus latiflorus）以氯化鋅為活化劑製備高比表面積活性碳。材料尺寸、浸漬比、活化溫度和持溫時間皆會影響活性碳之比表面積、孔隙形態和收率。研究結果顯示，以氯化鋅活化方式製備麻竹活性碳，以浸漬比5:1、活化溫度500°C、持溫時間120 min可得到比表面積1387 m^2/g及微孔體積0.74 cm^3/g為最佳製備條件。依據IUPAC之等溫吸脫附曲線分類，本試驗以不同變因製備之麻竹活性碳，其等溫吸脫附曲線皆呈現type I類型，屬Langmuir單層飽和吸附，且具有以微孔為主之孔隙。利用低成本及低溫活化方式製備所需活性碳之孔隙大小分布與孔徑形態，以氯化鋅化學活化方式為一有效的方法。

關鍵字

麻竹活性碳 ； 氯化鋅 ； 化學活化 ； 孔隙性質 ； 等溫吸脫附曲線

並列摘要

High specific surface area activated carbon materials have been produced from the naturally occurring Ma bamboo (Dendrocalamus latiflorus) by using zinc chloride (ZnCl_2) as the activating agent. The effects of different sizes of raw materials, impregnation ratios, activation temperatures and holding times on the specific surface area, pore morphology, and yield of activated carbon are studied. According to these results, a high specific surface area and micropore volume were achieved as high as 1387 m^2/g and 0.74 cm^3/g for activated carbon derived from Ma bamboo by zinc chloride, under the optimized conditions of impregnation ratio 5:1, activation temperature of 500°C, and a holding time of 120 min. According to IUPAC adsorption-desorption isotherms curve classification, the Type I isotherm is suitable to explicate results prepared activated carbon from Ma bamboo by different variables, the adsorption data were well described by Langmuir monolayer adsorption, indicating the major microporous structures. Chemical activation of Ma bamboo by ZnCl_2 is a useful technique for obtaining activated carbon with desired pore size distributions and pore morphologies from low cost precursors and at low activation temperatures.

並列關鍵字

Ma bamboo activated carbon ； Zinc chloride ； Chemical activation ； Pore characterization ； Adsorption-desorption isotherm curve