摘要
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、p H和温度等对甲基橙吸附性能的影响,结果表明,1.0CEC的12-2-12-MMT和16-2-16-MMT在20℃、p H=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。
Organo-montmorillonites 12-2-12-MMT and 16-2-1.6-MMT were prepared by two modification treatment of cationic Gemini surfactants 1 , 2-bis （dodeeyldimethylammonio） 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 surfaetants had inserted into the lamella of montmorillonite successfully, the interlayer spacer increased with the increasing of the cationic exchange capacity （CEC） of surfactants 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 surfaetants, contact time, temperature and pH. The optimal conditions for methyl orange adsorption were 1.0 CEC of MMT, 20℃ , pH 3, and contact time 6 h. The adsorption capability of 16-2-16- MMT was better than that of 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.
出处
《化学通报》
CAS
CSCD
北大核心
2016年第12期1178-1183,共6页
Chemistry
基金
国家级大学生创新训练项目(201610122004)
山西省大学生创新训练项目(2016428)资助
