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以开孔的二维MFI纳米片为构筑单元制备沸石片膜 预览

Fabrication of Zeolite Membranes Using Two-Dimensional Open-Pore MFI Nanosheets as Building Blocks
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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?鄄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?鄄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?鄄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。 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.
作者 吴云琴 郑璐康 陈琦 俞梦婷 王金桂 张富民 肖强 朱伟东 WU Yun-Qin;ZHENG Lu-Kang;CHEN Qi;YU Meng-Ting;WANG Jin-Gui;ZHANG Fu-Min;XIAO Qiang;ZHU Wei-Dong(Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, China;School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353, China)
出处 《无机化学学报》 SCIE CAS CSCD 北大核心 2019年第1期89-94,共6页 Chinese Journal of Inorganic Chemistry
基金 国家自然科学基金(No.21471131,21576243) 浙江省新苗人才计划资助项目(No.2017R404018)资助。
关键词 沸石 纳米结构 纳米片 食人鱼溶液 异构体分离 zeolites membranes nanostructures nanosheets piranha solution isomer separation
作者简介 通信联系人:肖强。E-mail:xiaoq@zjnu.cn
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