| 以开孔的二维MFI纳米片为构筑单元制备沸石片膜 | |
| Fabrication of Zeolite Membranes Using Two-Dimensional Open-Pore MFI Nanosheets as Building Blocks | |
| 摘要: 以食人鱼溶液（体积比为3：1的95%~98%（w/w）H2SO4和30%（w/w）H2O2混合液）处理多层MFI（ML-MFI）除去有机结构导向剂（OSDA），经超声剥离和沉降纯化后得到了开孔的MFI沸石纳米片。采用X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、N2吸附-脱附、傅立叶变换红外光谱（FT-IR）和热重分析（TGA）等手段对得到的MFI沸石纳米片进行表征，发现食人鱼溶液处理可移除ML-MFI中的OSDA，再经超声剥离得到可分散、开孔的MFI沸石纳米片。将MFI沸石纳米片用简单抽滤的方式沉积到自制Al2O3载体上，不经二次生长得到了连续的沸石纳米片膜。单组分气体渗透性能测试结果表明，制备的MFI沸石纳米片膜对正/异丁烷的理想选择性为4.1~5.8，正丁烷的渗透速率为2.2×10-7~4.1×10-7 mol·m-2·s-1·Pa-1。 | |
| 关键词: 沸石 膜 纳米结构 纳米片 食人鱼溶液 异构体分离 | |
| 基金项目: 国家自然科学基金（No.21471131，21576243）和浙江省新苗人才计划资助项目（No.2017R404018）资助。 | |
| Abstract: Open-pore MFI zeolite nanosheets were prepared by removal of organic structure-directing agents (OSDA) from a multilamellar MFI zeolite (ML-MFI) using a mixture of 95%~98%(w/w) H2SO4 and 30%(w/w) H2O2 with VH2SO4:VH2O2=3:1 (known as piranha solution), followed by ultrasonication for exfoliation and sedimentation for purification. The exfoliated MFI zeolite nanosheets were characterized by various techniques, such as X-ray diffraction (XRD), scanning electron microscope (SEM), transmittance electron microscope (TEM), N2 adsorption-desorption, Fourier transform infrared spectrometer (FT-IR) and thermal gravimetric analyzer (TGA), etc., indicating that OSDA was removed after the piranha solution treatment and dispersed, open-pore MFI nanosheets were obtained followed by exfoliation through ultrasonication. Continuous MFI nanosheet membranes were prepared by depositing the open-pore MFI nanosheets on home-made alumina disc supports by a simple vacuum-assisted filtration method. Single gas permeance tests on the MFI zeolite nanosheet membranes indicated that ideal selectivities for n-butane over i-butane of 4.1~5.8 with a permeance of n-butane of 2.2×10-7~4.1×10-7 mol·m-2·s-1·Pa-1 were achieved. | |
| Keywords: zeolites membranes nanostructures nanosheets piranha solution isomer separation | |
| 投稿时间：2018-09-03 修订日期：2018-11-12 | |
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| 吴云琴,郑璐康,陈琦,俞梦婷,王金桂,张富民,肖强,朱伟东.以开孔的二维MFI纳米片为构筑单元制备沸石片膜[J].无机化学学报,2019,35(1):89-94. | |
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