| 梁亚琴,张晓燕,闫煜东,杨文卓,周立华.化学通报,2016,79(12):1178-1183. |
| Gemini表面活性剂改性有机蒙脱土的制备及其对甲基橙的吸附性能 |
| Preparation of Organo-montmorillonites Modified by Gemini Surfactants and their Adsorption of Methyl Orange |
| 投稿时间：2016-06-23 修订日期：2016-07-23 |
| DOI： |
| 中文关键词: 有机蒙脱土 Gemini表面活性剂 甲基橙 吸附 |
| 英文关键词:organo-montmorillonite, gemini surfactant, methyl orange, adsorption |
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| 中文摘要: |
| 本文分别以1,2-亚乙基-双（十二烷基二甲基溴化铵）12-2-12和1,2-亚乙基-双（十六烷基二甲基溴化铵）16-2-16为插层试剂，通过离子交换法合成了不同阳离子交换量的有机蒙脱土12-2-12-MMT和16-2-16-MMT，FTIR、XRD和TG-DTG分析表明，随着阳离子交换量的增大和Gemini表面活性剂碳链的增长，改性蒙脱土的层间距增大。考察阳离子交换量、时间、pH和温度等对甲基橙吸附性能的影响，结果表明：在实验范围内，1.0CEC的12-2-12-MMT和16-2-16-MMT在20 ℃、pH=3、6 h对甲基橙吸附的效果最好；且同一吸附条件下16-2-16-MMT对甲基橙吸附性能明显优于12-2-12-MMT，有机蒙脱土对甲基橙的吸附动力学符合准二级动力学方程，热力学符合Langmuir吸附等温式。 |
| 英文摘要: |
| Organo-montmorillonite 12-2-12-MMT and 16-2-16-MMT were prepared by two modification treatment of cationic gemini surfactants 1,2-bis(dodecyldimethylammonio)ethanedibromide 12-2-12 and 1,2-bis(cetyldimethylammonio)ethanedibromide 16-2-16. The modified samples were characterized by XRD, FT-IR and TG-DTG, and the results showed that the surfactants had inserted into the lamella of montmorillonite successfully, the interlayer spacer increased with the increasing of the cationic exchange capacity of surfactants (CEC) and the chain length. The adsorption experiments of methyl orange onto organo-montmorillonite were studied using batch method as a function of the concentration of surfactants (C), contact time (t), temperature (T) and pH. The optimal conditions for methyl orange onto organo-montmorillonite were as follows: C of 1.0 CEC, t of 6 h, T of 20 ℃, pH of 3; at?the?same?experimental condition, the?adsorption?of?16-2-16-MMT was better than?12-2-12-MMT. The kinetic data were better described by the pseudo-second order kinetics model. The adsorption isotherm was in good agreement with the Langmuir model． |
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