Fe3O4 and tetraethyl orthosilicate functionalized Fe3O4 were used as magnetic fillers into polydimethylsiloxane (PDMS) matrix,fabricated PDMS/Fe3O4 and PDMS/TEOS@Fe3O4 magnetic organosilicon membranes by solvent evaporation methods,respectively.The effect of surface modification of Fe3O4 particles on the separation performance of the membrane for O2/N2 was studied.The results indicated that modification of Fe3O4 with TEOS helps to enhance the O2/N2 selectivity of PDMS/TEOS@Fe3O4 without external magnetic field due to the enhanced interfacial compatibility.The O2/N2 selectivity of PDMS/TEOS@Fe3O4 and PDMS/Fe3O4 magnetic membranes increased by 16.2% and 8.0%,respectively.The O2 permeability coefficient of PDMS/Teos@fe3O4 was 1483 Barrer,and the ideal O2/N2 selectivity was 2.2 under external magnetic field of 56mT.The inevitable interfacial defects in PDMS/Fe3O4 can be considered to be the transport channel of O2 with low resistance under external magnetic field.Therefore,the O2/N2 selectivity of PDMS/Fe3O4 showed a large enhancement than that of PDMS/TEOS@Fe3O4.
Wang Aosheng, Xu Jibin, Bai Yunxiang, Sun Yuping, Zhang Chunfang
. Preparation of magnetic PDMS/TEOS@Fe3O4 membrane by TEOS modified Fe3O4 for O2/N2 separation[J]. New Chemical Materials, 2020
, 48(12)
: 84
-88
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.021
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