Desorption behavior of ethanedioic acid and benzoic acid on activated carbon

被引：0
作者：
Wang, Zhanying [1 ]
Liu, Yingshu [1 ,2 ]
Li, Ziyi [1 ]
Yang, Xiong [1 ,2 ]
Yang, Quan [1 ]
Jiang, Lijun [1 ]
机构：
[1] School of Mechanical Engineering, University of Science and Technology Beijing, Beijing
[2] Beijing Engineering Research Center for Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2015年 / 66卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Activated carbon; Adsorption-desorption mechanism; Benzoic acid; Desorption; Ethanedioic acid; Kinetics;
D O I：
10.11949/j.issn.0438-1157.20150408
中图分类号：
学科分类号：
摘要：
Low-volatility organic acids are harmful to the environment. Adsorption/desorption study of organic acids on adsorbents is of great significance to control these pollutants. Here temperature programmed desorption method was used to study the desorption behavior of ethanedioic and benzoic acids on activated carbon. Results show that textural characteristics of activated carbon play a critical role since wide micropores (0.7-2 nm) and narrow micropores (<0.7 nm) dominate the adsorption at active sites I and II, respectively. Interactions of ethanedioic and benzoic acids with active site I (Ed = 101.63, 112.43 kJ·mol-1) are weaker than those with active site II (Ed=118.01, 130.87 kJ·mol-1), whereas the adsorption amount on active site I is much larger than that on active site II. Molecular sieving effect is shown to explain the fact that ethanedioic acid with a chain structure and smaller kinetic diameter is easier to be adsorbed into narrow micropores as compared to benzoic acid with a circular structure and larger kinetic diameter. © All right reserved.
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页码：4016 / 4024
页数：8
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