Hydrothermally Reduced Graphene Oxide Interfaces for Synthesizing High‐Performance Metal–Organic Framework Hollow Fiber Membranes. Issue 14 (3rd May 2018)

• Record Type: Journal Article
• Authors: Li, Wanbin; Shi, Jiali; Li, Zhanjun; Wu, Wufeng; Xia, Yan; Yu, Yang; Zhang, Guoliang
• Is Part Of: Advanced materials interfaces. Volume 5:Issue 14(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-03
• Subjects: graphene oxides -- hydrogen purification -- interfacial synthesis -- metal–organic frameworks -- ultrathin membranes; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201800032
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Metal–organic framework (MOF) membranes are attracting numerous attentions recently. However, fabrication of ultrathin and precisely molecular sieving MOF membranes, especially with highly processable polymeric hollow fiber substrates, is a great challenge. Here, the defect‐free ZIF‐8 composite hollow fiber membranes with impressive performance for hydrogen permselectivity are fabricated by novel interfacial contra‐diffusion synthesis. The reduced graphene oxide (rGO) membranes with good selectivity are prepared on hollow fiber substrates via hydrothermal treatment. By employing the prepared rGO membranes as sharp interfaces to promote the heterogeneous nucleation and control the diffusion of precursors, the ultrathin and uniform MOF membranes with thickness of 150 nm can be regionally crystallized at interfaces by contra‐diffusion synthesis. The prepared ZIF‐8/rGO composite membranes display outstanding separation performance in H2 purification, with permeance over 60 × 10 −8 mol m −2 s −1 Pa −1 and H2 /CO2, H2 /N2 and H2 /CH4 selectivities up to 25.3, 70.4, and 90.7, respectively. Moreover, the membranes thus prepared have good reproducibility and long‐term stability. Abstract : The ultrathin zeolitic imidazolate framework‐8 (ZIF‐8) composite hollow fiber membranes are fabricated by novel interfacial contra‐diffusion synthesis, through employing hydrothermally deposited rGO layers as interfaces to provide nucleation sites, and reduce precursor diffusions. The 150‐nm ZIF‐8/rGO membranes show impressive H2 /CO2 (25.3), H2 /N2 (70.4), and H2 /CH4 (90.7) selectivities, with large H2 permeance over 60 × 10 −7 mol m −2 s −1 Pa −1 .