Preparation of highly microporous carbons from fir wood by KOH activation for adsorption of dyes and phenols from water

被引:163
作者
Wu, FC
Tseng, RL
Juang, RS
机构
[1] Natl United Univ, Dept Chem Engn, Kung Ching Li 360, Miao Li, Taiwan
[2] Natl United Univ, Dept Safety Hlth & Environm Engn, Kung Ching Li 360, Miao Li, Taiwan
[3] Yuan Ze Univ, Dept Chem Engn & Mat Sci, Chungli 320, Taiwan
关键词
fir wood; activated carbons; KOH activation; steam activation; physical properties; adsorption kinetics;
D O I
10.1016/j.seppur.2005.03.013
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The carbonaceous adsorbents with controllable pore sizes were prepared from carbonized fir wood (i.e., char) by KOH and steam activation. Pore properties of the carbons including the BET surface area, pore volume, pore size distribution, and pore diameter were characterized from N-2 isotherms. Through varying KOH/char ratio from 0.5 to 6, the KOH-activated carbons exhibited the surface area ranging from 891 to 2794 m(2) g(-1) with a fraction of micropore volume of 0.76-0.82. On the other hand, carbons activated by steam at 900 degrees C for 5 and 7 h had a surface area of 1016 and 1131 m(2) g(-1) with a fraction of micropore volume of 0.51 and 0.48, respectively. The kinetics of adsorption of methylene blue, basic brown 1, acid blue 74, 2,4-dichlorophenol, 4-chlorophenol, p-cresol, and phenol from water on all the carbons studied were examined to check their chemical characteristics. The effective particle diffusivities within carbon particles were also evaluated. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:10 / 19
页数:10
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