Adsorption of benzene, cyclohexane and hexane on ordered mesoporous carbon  

作　　者：Gang Wang Baojuan Dou Zhongshen Zhang Junhui Wang Haier Liu Zhengping Hao 

机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences [2]School of Materials Science and Engineering, University of Science and Technology Beijing

出　　处：《Journal of Environmental Sciences》2015年第4期65-73,共9页环境科学学报（英文版）

基　　金：the State Key program of National Natural Science Foundation (No. 21337003);the Strategic Priority Research Program (No. XDB05050200);the National High Technology Research and Development Program of China (2012AA063101);the Special Environmental Protection Foundation for Public Welfare Project (No. 201309073);the Team Interaction and Cooperation of the Science and Technology Program of the Chinese Academy of Sciences

摘　　要：Ordered mesoporous carbon（OMC） with high specific surface area and large pore volume was synthesized and tested for use as an adsorbent for volatile organic compound（VOC）disposal. Benzene, cyclohexane and hexane were selected as typical adsorbates due to their different molecular sizes and extensive utilization in industrial processes. In spite of their structural differences, high adsorption amounts were achieved for all three adsorbates, as the pore size of OMC is large enough for the access of these VOCs. In addition, the unusual bimodal-like pore size distribution gives the adsorbates a higher diffusion rate compared with conventional adsorbents such as activated carbon and carbon molecular sieve. Kinetic analysis suggests that the adsorption barriers mainly originated from the difficulty of VOC vapor molecules entering the pore channels of adsorbents. Therefore, its superior adsorption ability toward VOCs, together with a high diffusion rate, makes the ordered mesoporous carbon a promising potential adsorbent for VOC disposal.Ordered mesoporous carbon（OMC） with high specific surface area and large pore volume was synthesized and tested for use as an adsorbent for volatile organic compound（VOC）disposal. Benzene, cyclohexane and hexane were selected as typical adsorbates due to their different molecular sizes and extensive utilization in industrial processes. In spite of their structural differences, high adsorption amounts were achieved for all three adsorbates, as the pore size of OMC is large enough for the access of these VOCs. In addition, the unusual bimodal-like pore size distribution gives the adsorbates a higher diffusion rate compared with conventional adsorbents such as activated carbon and carbon molecular sieve. Kinetic analysis suggests that the adsorption barriers mainly originated from the difficulty of VOC vapor molecules entering the pore channels of adsorbents. Therefore, its superior adsorption ability toward VOCs, together with a high diffusion rate, makes the ordered mesoporous carbon a promising potential adsorbent for VOC disposal.

关 键 词：Volatile organic compounds Adsorption Ordered mesoporous carbon Isosteric heat of adsorption Knudsen diffusion 

分 类 号：X511[环境科学与工程—环境工程]