Impregnation of ionic liquids in mesoporous silica using supercritical carbon dioxide and co-solvent
Impregnation of ionic liquids in mesoporous silica using supercritical carbon dioxide and co-solvent
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DOI：
10.1039/c6ra20287j
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发表时间：
2016-10
期刊：
影响因子：
3.9
通讯作者：
Qin‐Qin Xu;Jianzhong Yin;Xuerong Zhou;Guangzhao Yin;Yifan Liu;P. Cai;Aiqin Wang
中科院分区：
文献类型：
--
作者：
Qin‐Qin Xu;Jianzhong Yin;Xuerong Zhou;Guangzhao Yin;Yifan Liu;P. Cai;Aiqin Wang
离子液体（Ionic Liquids，ILs）被认为是CO2捕集的有吸引力的替代物。将离子液体浸渍在多孔基底上，可以显著降低离子液体的消耗，增强离子液体中CO2的传质，并使离子液体的回收更容易。然而，由于离子液体的高粘度，当使用传统的浸渍方法时，浸渍的离子液体通常在基底上分散不良或堵塞纳米通道。本研究提出了一种新的、有效的、环境友好的将离子液体吸附到介孔基底上的方法。以超临界二氧化碳（scCO 2）为溶剂，甲醇为共溶剂，成功地实现了[Bmim] BF 4在SBA-15表面的浸渍。通过N2吸附-脱附和SEM分析，证明离子液体是浸渍在纳米通道中而不是在基底的外部。研究了反应压力、反应温度和反应时间对合成纳米复合材料的影响。最后，在动态吸附装置上考察了ILs@SBA-15复合材料对CO2的吸附性能。
Ionic liquids (ILs) have been considered to be attractive alternatives for CO2 capture. The impregnation of ILs on porous substrates can significantly reduce the ILs consumption, enhance the mass transfer of CO2 in the ILs and make their recycling easier. However, due to the high viscosity of the ILs, the impregnated ILs were often poorly dispersed on the substrates or blocked the nanochannels when the traditional impregnation method was used. In this study, a new, effective and environmentally benign technique to impregnate ILs onto mesoporous substrates was proposed. The impregnation of [Bmim]BF4 on SBA-15 was successfully achieved using supercritical carbon dioxide (scCO2) as the solvent and methanol as co-solvent. The ILs were proved to be impregnated into the nanochannels rather than on the outside of the substrate by N2 adsorption–desorption and SEM analysis. The operating pressure, temperature and time were investigated to find out the optimum parameter to synthesis these nanocomposites. Finally, the CO2 adsorption capacity of the ILs@SBA-15 composites was performed on a dynamic adsorption apparatus.