化工学报2015，Vol.66Issue(12)：4865-4873,9.DOI:10.11949/j.issn.0438-1157.20150595
多壁碳纳米管吸附处理柴油废水的动力学特性
Kinetics for adsorption treatment of diesel oil waste water by multi-walled carbon nanotubes
摘要
Abstract
The adsorption kinetics of diesel oil by multi-walled carbon nanotubes (MWCNTs) was investigated using static adsorption experiment and compared with activated carbon. The results show that the adsorption quantities on both the MWCNTs and activated carbon increase fast in the first 10 min, and the adsorption equilibrium can be reached in about 60 min, while the adsorption capacity on MWCNTs is far higher than activated carbon. The kinetic analysis shows that the adsorption kinetics can be accurately represented by a pseudo second-order model. The activation energy (Ea) of 14.21 kJ·mol-1, determined by the Arrhenius law, suggests that physisorption dominates the adsorption of diesel oil 2# onto MWCNTs. The analyzing results with intraparticle diffusion model show that the adsorption mechanism is complex for MWCNTs, consisting of external surface adsorption, internal diffusion in large interstitial pores and in small interstitial pores between the tubes, while for activated carbon it consists of external surface and intraparticle diffusion stages andis strongly influenced by the boundary layer. Initial adsorption behavior is found in the adsorption process of diesel oil onto MWCNTs. The adsorption of three diesel oils at constant temperature (298 K) and that of diesel oil 2# at different temperatures (288, 298 and 308 K) show intermediately initial adsorption behavior. For diesel oil 2#, with the increase of temperature, the initial adsorption enhances, and at 318 K, intensive initial adsorption occurs.关键词
多壁碳纳米管/柴油/吸附动力学Key words
multi-walled carbon nanotubes/diesel oil/adsorption kinetics分类
化学化工引用本文复制引用
朱慧,刘会娥,黄剑坤,陈爽,丁传芹,齐选良..多壁碳纳米管吸附处理柴油废水的动力学特性[J].化工学报,2015,66(12):4865-4873,9.基金项目
国家自然科学基金青年基金项目(21106187) （21106187）
中央高校基本科研业务费专项项目(14CX05031A) （14CX05031A）
黄岛区科技项目(201-1-49). supported by the National Natural Science Foundation of China (21106187), Special Funds for Basic Scientific Research Business of Central University (14CX05031A) and Huangdao District Science and Technology Project (201-1-49). （201-1-49）
