吸附
朗缪尔
微型多孔材料
邻苯二甲酸二乙酯
朗缪尔吸附模型
色散(光学)
化学
热重分析
水溶液
邻苯二甲酸盐
动力学
动能
邻苯二甲酸二甲酯
热力学
分析化学(期刊)
材料科学
物理化学
色谱法
有机化学
物理
光学
量子力学
作者
Tatianne Ferreira de Oliveira,Benoı̂t Cagnon,Henri Fauduet,Marina Licheron,Olivier Chedeville
标识
DOI:10.1080/01496395.2011.645184
摘要
The adsorption of diethyl phthalate (DEP) was studied on four activated carbons (ACs) with different chemical and microporous properties. The kinetic results showed that the non-linear form of the pseudo-second order kinetic model provided the best parameters. Results further showed that the DEP adsorption kinetics is favored by ACs which have a ratio of a specific microporous surface to a specific external surface that is relatively low. Besides, an increase in temperature induced an increase in the rate constant k 2 , but the adsorption capacity is temperature independent. Two models, (Langmuir (linear and non-linear forms) and Dubinin-Radushkevich-Kaganer (DRK)), were tested from experimental data. While the Langmuir model provided the best correlation on all the ACs studied. The surface occupied, calculated with the Langmuir parameter obtained by the non-linear form, evidenced the importance of the external surface and the mean pore size. The results show that the non-electrostatic interactions are predominant in the DEP adsorption and are essentially due to dispersion and hydrophobic interactions (for L27 and X17). In the case of F22 and S21 the DEP adsorption is only due to dispersion interaction. A comparison of the thermogravimetric analysis of the ACs washed and saturated shows that the DEP is totally desorbed between 300 and 500°C with a characteristic peak.
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