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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。
Ethylenebis (dodecyldimethylammonium bromide) (12-2-12) and 1,2-ethylene-bis (hexadecyldimethyl-brominated Ammonium) (16-2-16) was used as intercalation reagent. The organic montmorillonites 12-2-12-MMT and 16-2-16-MMT with different cation exchange capacity were synthesized by ion exchange method. FTIR, XRD and TG-DTG analysis showed that with the increase of cation exchange capacity and the increase of Gemini surfactant carbon chain, the interlayer spacing of modified montmorillonite increased. The effects of cation exchange capacity, time, p H and temperature on the adsorption properties of methyl orange were investigated. The results showed that at 12 ℃, pH of 12-2-12-MMT and 16-2-16-MMT at 1.0CEC were , 6 h on methyl orange adsorption the best; and the same adsorption conditions 16-2-16-MMT adsorption of methyl orange was significantly better than 12-2-12-MMT, montmorillonite on methyl orange The adsorption kinetics are in accordance with the quasi - second order kinetic equation and the thermodynamics are in accordance with the Langmuir adsorption isotherm.