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Highly water-selective membranes based on hollow covalent organic frameworks with fast transport pathways
Yang, H; Cheng, XP; Cheng, XX; Pan, FS; Wu, H; Liu, GH; Song, YM; Cao, XZ; Jiang, ZY; Cao XZ(曹兴忠)
2018
Source PublicationJOURNAL OF MEMBRANE SCIENCE
ISSN0376-7388
EISSN1873-3123
Volume565Pages:331-341
SubtypeArticle
AbstractCovalent organic frameworks (COFs) are attractive candidates for membrane separation owing to their well-ordered channels and facilely tailored functionalities. However, the development of COF-based membranes remains in its infancy. To establish novel hierarchical structures in COFs, in this study, a facile template-directed approach is exploited for constructing hollow COF nanospheres. An imine-linked COF TpBD, derived from 1,3,5-triformylphloroglucinol (Tp) and benzidine (BD), was selected as the building block due to its rich hydrophilic groups and high stability. The synthesized hollow TpBD (H-TpBD) nanospheres were introduced into sodium alginate (SA) matrices to fabricate water-selective hybrid membranes. The H-TpBD nanospheres confer the membranes rapid diffusion pathways and abundant interacting sites for water molecules, thus fast water-selective permeation through the membranes was achieved. The hybrid membranes exhibit the optimal performance with permeation flux of 2170 g m(-2) h(-1) and separation factor of 2099 when used for dehydrating 90 wt % ethanol aqueous solution at 76 degrees C. The effects of hollow structures of H-TpBD on membrane performance were investigated and the molecular transport mechanisms through the membranes were elucidated. Besides, the favorable compatibility between SA and H-TpBD endows the hybrid membranes with long-term stability.
KeywordCovalent organic frameworks Hollow structures, Hybrid membranes Ethanol dehydration Water-selective permeation
DOI10.1016/j.memsci.2018.08.043
WOS KeywordMIXED-MATRIX MEMBRANES ; COMPOSITE MEMBRANES ; SODIUM ALGINATE ; HYBRID MEMBRANE ; PERVAPORATION PERFORMANCE ; CARBON NANOTUBES ; DEHYDRATION ; SEPARATION ; MICROSPHERES ; CRYSTALLINE
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Polymer Science
WOS SubjectEngineering, Chemical ; Polymer Science
WOS IDWOS:000444090600033
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/286311
Collection实验物理中心
多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Yang, H,Cheng, XP,Cheng, XX,et al. Highly water-selective membranes based on hollow covalent organic frameworks with fast transport pathways[J]. JOURNAL OF MEMBRANE SCIENCE,2018,565:331-341.
APA Yang, H.,Cheng, XP.,Cheng, XX.,Pan, FS.,Wu, H.,...&曹兴忠.(2018).Highly water-selective membranes based on hollow covalent organic frameworks with fast transport pathways.JOURNAL OF MEMBRANE SCIENCE,565,331-341.
MLA Yang, H,et al."Highly water-selective membranes based on hollow covalent organic frameworks with fast transport pathways".JOURNAL OF MEMBRANE SCIENCE 565(2018):331-341.
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