Surface chemistry, pore sizes and adsorption properties of activated carbon fibers and precursors treated with ammonia
Surface chemistry, pore sizes and adsorption properties of activated carbon fibers and precursors treated with ammonia
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DOI：
10.1016/s0008-6223(00)00319-5
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发表时间：
2001-01-01
期刊：
影响因子：
10.9
通讯作者：
Foster, KL
中科院分区：
文献类型：
--
作者：
Mangun, CL;Benak, KR;Foster, KL
采用氨法制备了一系列活性炭纤维（ACFs），得到了碱性表面。通过氮气吸附实验测定了化学改性纤维的微孔尺寸，发现微孔尺寸随活化时间和温度的增加而增大。用傅里叶变换红外光谱（FTIR）分析了存在的基团类型。x射线光电子能谱（XPS）和程序升温解吸（TPD）。酸性气体（HCl）的吸附等温线表明，与未经处理的酸性纤维相比，其吸附能力有很大提高。吸附是完全可逆的，因此必须涉及增强的物理吸附而不是化学吸附。这表明ACFs可以根据其孔表面的化学修饰来选择性地去除特定的污染物。2001爱思唯尔科学有限公司版权所有。
A series of activated carbon fibers (ACFs) were produced by treatment with ammonia to yield a basic surface. The micropore sizes of these chemically modified fibers were determined with nitrogen adsorption experiments and they were shown to increase with increasing activation time and temperature. The types of groups present were analyzed by Fourier transform infrared spectroscopy (FTIR). X-ray photoelectron spectroscopy (XPS), and temperature programmed desorption (TPD). The adsorption isotherms of an acidic gas (HCl) show a great improvement in capacity over an untreated acidic fiber. The adsorption is completely reversible and must therefore involve enhanced physical adsorption instead of chemisorption. This demonstrates that ACFs can be tailored to selectively remove a specific contaminant based on the chemical modification of their pore surfaces. (C) 2001 Elsevier Science Ltd. All rights reserved.