Nanoporous polymer - Clay hybrid membranes for gas separation

被引:53
作者
Defontaine, Guillaume [1 ,2 ]
Barichard, Anne [1 ,2 ]
Letaief, Sadok [1 ,2 ]
Feng, Chaoyang [3 ]
Matsuura, Takeshi [3 ]
Detellier, Christian [1 ,2 ]
机构
[1] Univ Ottawa, Ctr Catalysis Res & Innovat, Ottawa, ON K1N 6N5, Canada
[2] Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada
[3] Univ Ottawa, Dept Chem Engn, Ottawa, ON K1N 6N5, Canada
基金
加拿大自然科学与工程研究理事会; 加拿大创新基金会;
关键词
Separation membranes; Inorganic membranes; Polydimethylsiloxane; Clay minerals; Sepiolite; Montmorillonite; Si-29 MAS NMR; Nanohybrid materials; Thermal gravimetric analysis; Scanning electron microscopy; MAYA BLUE; MAGNETIC-RESONANCE; SEPIOLITE; TUNNELS; STRUCTURATION; PERMEATION; FABRICATION; MOLECULES; MINERALS; SURFACE;
D O I
10.1016/j.jcis.2009.11.048
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanohybrid organo-inorgano clay mineral-polydimethylsiloxane (PDMS) membranes were prepared by the reaction of pure and/or modified natural clay minerals (Sepiolite and montmorillonite) with PDMS in hexane, followed by evaporation of the solvent at 70 degrees C. The membranes were characterized by means of XRD, SEM, ATD-TG and solid state Si-29 magic angle spinning (MAS) and cross-polarization (CP) CP/MAS NMR. The morphology of the membranes depends on the content loading of clay mineral. For low content, the membrane composition is homogeneous, with well dispersed nanoparticles of clay into the polymer matrix, whereas for higher clay content, the membranes are constituted also of a mixture of well dispersed nanoparticles into the polymer, but in the presence of agglomerations of small clay particles. Quantitative Si-29 MAS NMR demonstrated a strong correlation between the clay content of the membrane and the average length of the PDMS chain, indicating that the nanohybrid material is made of clay particles covalently linked to the PDMS structure. This is particularly the case for Sepiolite with has a high density of Q(2) silanol sites. The separation performances of the prepared membranes were tested for CO2/ CH4 and O-2/N-2 mixtures. The observed separation factors showed an increase of the selectivity in the case of CO2/CH4 in comparison with membranes made from PDMS alone under the same conditions. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码:622 / 627
页数:6
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