DOI: 10.1016/j.watres.2019.01.043
Scopus记录号: 2-s2.0-85061384722
论文题名: Thin film nanocomposite hollow fiber membranes comprising Na + -functionalized carbon quantum dots for brackish water desalination
作者: Gai W. ; Zhao D.L. ; Chung T.-S.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 54
结束页码: 61
语种: 英语
英文关键词: Hollow fiber configuration
; Na + -functionalized carbon quantum dots (Na-CQDs)
; Reverse osmosis (RO)
; Stabilization
; Thin film nanocomposite (TFN) membranes
Scopus关键词: Carbon
; Composite membranes
; Desalination
; Fibers
; Nanocomposite films
; Nanocomposites
; Nanocrystals
; Semiconductor quantum dots
; Sodium chloride
; Stabilization
; Thin films
; Water filtration
; Brackish water desalinations
; Carbon quantum dots
; Hollow fiber
; Interfacial polymerization
; Oxygen containing groups
; Pure water permeabilities
; Thin-film composite membrane
; Thin-film nanocomposites
; Osmosis membranes
; brackish water
; carbon
; nanocomposite
; oxygen
; polyamide
; quantum dot
; sodium chloride
; sodium ion
; thinner
; aqueous solution
; brackish water
; comparative study
; composite
; desalination
; film
; membrane
; nanocomposite
; polymerization
; quantum mechanics
; reverse osmosis
; stabilization
; aqueous solution
; Article
; controlled study
; desalination
; hydrophilicity
; particle size
; physical chemistry
; polymerization
; pressure
; priority journal
; water permeability
英文摘要: We have incorporated Na + -functionalized carbon quantum dots (Na-CQDs) into the polyamide layer via interfacial polymerization reaction and developed novel thin film nanocomposite (TFN) hollow fiber membranes for brackish water desalination. Comparing with the conventional thin film composite (TFC) membranes, the TFN membranes comprising Na-CQDs have a larger effective surface area, thinner polyamide layer and more hydrophilic oxygen-containing groups in the polyamide layer. Besides, the interstitial space among the polyamide chains becomes larger due to the presence of Na-CQDs. As a result, the incorporation of 1 wt% Na-CQDs into the polyamide layer could improve the pure water permeability (PWP) of the membranes from 1.74 LMH/bar to 2.56 LMH/bar by 47.1% without compromising their NaCl rejection of 97.7%. Interestingly, stabilization of the TFN hollow fiber membranes containing 1 wt% Na-CQDs at 23 bar could further promote the PWP to 4.27 LMH/bar and the salt rejection to 98.6% under the same testing conditions due to the deformation of the membranes under a high hydraulic pressure. When using a 2000 ppm NaCl aqueous solution as the feed, the optimal water flux and rejection of the newly developed TFN membranes at 15 bar are 57.65 ± 3.26 LMH and 98.6% ± 0.35% respectively. The Na-CQDs incorporated TFN hollow fiber membranes show promising applications in the field of brackish water desalination. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121959
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
Recommended Citation:
Gai W.,Zhao D.L.,Chung T.-S.. Thin film nanocomposite hollow fiber membranes comprising Na + -functionalized carbon quantum dots for brackish water desalination[J]. Water Research,2019-01-01