咪唑类离子液体在蒙脱石上的吸附行为与机理

发布时间：2018-06-24 13:28

本文选题：咪唑类离子液体(IBILS) + 蒙脱石　；参考：《中国环境科学》2017年04期

【摘要】：研究了钠型蒙脱石对系列咪唑类离子液体(IBILs,烷基链不同,阴离子类型不同)的吸附行为,并通过X射线衍射(XRD)和傅里叶红外光谱(FTIR)及扫描电镜(SEM)等对吸附行为进行了表征.讨论了pH值、离子浓度等对吸附的影响.结果表明,离子液体主要通过静电阳离子交换及烷基疏水作用吸附于蒙脱石之上.阴离子结构变化对吸附影响不大;而烷基链越长,离子液体的吸附量越大,EmimBF_4(1-乙基-3-甲基四氟硼酸盐),BmimBF_4(1-丁基-3-甲基四氟硼酸盐),HmimBF_4(1-己基-3-甲基四氟硼酸盐),OmimBF_4(1-辛基-3-甲基四氟硼酸盐)对应的平衡吸附量分别为33.94,40.48,44.40,53.29mmol/100g.离子液体进入蒙脱石层间后,层间距随着烷基链的增加从12.77A增大至14.41A.降低离子强度或提升pH值都会增强离子液体在蒙脱石上的吸附能力.
[Abstract]:The adsorption behavior of sodium montmorillonite on imidazole ionic liquids (IBILs, alkyl chains and anions) was studied. The adsorption behavior was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effects of pH value and ion concentration on adsorption were discussed. The results show that ionic liquids are mainly adsorbed on montmorillonite by electrostatic cation exchange and alkyl hydrophobic interaction. The change of anionic structure has little effect on adsorption, and the longer the alkyl chain is, The higher the adsorption capacity of ionic liquids, the greater the equilibrium adsorption capacity of Emm BF4 (1-ethyl-3-methyltetrafluoroborborate) BmimBF4 (1- Ding Ji -3-methyltetrafluoroborborate) HmimBF4 (1-hexyl-3-methyltetrafluoroborborate) OmimBF4 (1-octyl -3-methyltetrafluoroborborate) corresponding to 33.9440.48n44.4053.29mmol / 100g. When the ionic liquid enters the interlayer of montmorillonite, the interlayer spacing increases from 12.77A to 14.41A with the increase of alkyl chain. Decreasing ionic strength or increasing pH value can enhance the adsorption capacity of ionic liquids on montmorillonite.
【作者单位】：同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;
【基金】：国家自然科学基金资助项目(21377093,21677108)
【分类号】：X131;O647.3

【相似文献】