High performance ZIF-8 molecular sieve membrane on hollow ceramic fiber via crystallizing-rubbing seed deposition
2013; Elsevier BV; Volume: 220; Linguagem: Inglês
10.1016/j.cej.2013.01.051
ISSN1873-3212
AutoresKai Tao, Chunlong Kong, Liang Chen,
Tópico(s)Covalent Organic Framework Applications
ResumoIn this report, a continuous well-intergrown ZIF-8 membrane on hollow ceramic fiber tube was successfully synthesized by a novel crystallizing-rubbing seed deposition. It is shown that the obtained ZIF-8 membrane was compact and defect-free, with a thickness of about 5 μm. The obtained membrane displayed high H2 molecular sieve separation performance. Specifically, the H2 permeance reached an excellent value of 1.1 × 10−6 mol m−2 s−1 Pa−1, and the ideal separation factors for H2/CO2, H2/N2 and H2/CH4 were calculated to be 5.2, 7.3 and 6.8 at room temperature, respectively. We show that the fine seeds generated by crystallizing-rubbing play the key role for enhancing the heterogeneous nucleation of ZIF-8 crystals, which thus result in a high quality ZIF-8 membrane.
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