Adsorption mechanism of bisphenol A in aqueous solution using anionic-cationic surfactant modified attapulgite

被引：0
作者：
Zhao, Zilong [1 ]
Fu, Dafang [1 ]
机构：
[1] School of Civil Engineering, Southeast University
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2012年 / 42卷 / 05期
关键词：
Adsorption mechanism; Anionic-cationic surfactant modified attapulgite; Bisphenol A; Ultrasonic treatment;
D O I：
10.3969/j.issn.1001-0505.2012.05.023
中图分类号：
学科分类号：
摘要：
Using anionic surfactant sodium dodecyl sulfate (SDS) and cationic surfactant hexadecyl trimethylammonium bromide (HDTMAB) as modifiers, the adsorbent of attapulgite supported anionic-cationic surfactant was prepared through ultrasonic treatment. The adsorption characteristics, thermodynamics and kinetics of the adsorption of bisphenol A (BPA) in aqueous solution were studied by using static experiments, and the possible adsorption mechanism was proposed. The results show that there is no significant synergism for the mixed surfactants within the experimental ratio range. The adsorption kinetics of BPA on the adsorbent are in agreement with the pseudo-second-order rate equation, and the adsorption rate was controlled by intra-particle diffusion and extra-particle diffusion. Meanwhile, the adsorption isotherms can be described by using the Langmuir isotherm model, and surface adsorption plays a leading role in the process of BPA adsorption into organic-attapulgite. The adsorption accompanied by a decrease in entropy is a spontaneous and exothermic process, mainly dominated by the physical interaction which is expressed as the collaborative effects of hydrogen bond forces, van der Waals forces, hydrophobic bond forces and dipole bond forces an so on.
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页码：921 / 927
页数：6
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