Hydrophilic/hydrophobic Janus membranes with a dual-function surface coating for rapid and robust membrane distillation desalination

doi:10.1016/j.desal.2020.114561

CAS OpenIR

	Hydrophilic/hydrophobic Janus membranes with a dual-function surface coating for rapid and robust membrane distillation desalination
	Zhang, Yan 1,2; Shen, Fei 1,2; Cao, Weifeng 1; Wan, Yinhua 1,2
	2020-10-01
Source Publication	DESALINATION
ISSN	0011-9164
Volume	491 Pages:10
Abstract	Membrane distillation (MD) is a promising technique for desalinating brine and purifying wastewater but low water flux and severe membrane fouling always plague its practical application. Developing new membranes with both high flux and fouling resistance is highly desirable. Here, a hydrophilic/hydrophobic Janus membrane that can simultaneously achieve rapid and robust desalination via vacuum MD (VMD) was designed and fabricated by architecting a polydopamine-based hydrophilic surface coating on a commercial polytetrafluoroethylene (PTFE) membrane. Results demonstrated that such hydrophilic coating had the unique dual function: (1) boosting water evaporation via tuning the state of confined water and timely water replenishment and (2) providing a hierarchical layer with highly underwater oleophobicity. Due to the synergistic effect, the Janus membrane flux soared to 84.3 +/- 3.4 kg m(-2) h(-1) from 19.8 +/- 1.5 kg m(-2) h(-1) of the commercial PTFE membrane when treating a 3.5 wt% NaCl solution (70 degrees C, - 90 kPa), achieving an unprecedented 325.7% of flux enhancement, while also exhibiting long-term stability when desalinating oil-containing brine. Conversely, severe oil fouling occurred on the pristine PTFE membrane, quickly leading to near-zero flux. This work may provide a new platform and methodology for designing high-performance membranes for MD desalination.
Keyword	Hydrophilic coating Janus membrane Membrane distillation Desalination Dual-function coating
DOI	10.1016/j.desal.2020.114561
Language	英语
WOS Keyword	COMPOSITE MEMBRANES ; HOLLOW-FIBER ; CARBON NANOTUBES ; FLUX ENHANCEMENT ; PERFORMANCE ; LAYER ; OIL ; PROPERTY ; FABRICATION ; SEPARATION
Funding Project	Beijing Natural Science Foundation[8202044]
WOS Research Area	Engineering ; Water Resources
WOS Subject	Engineering, Chemical ; Water Resources
Funding Organization	Beijing Natural Science Foundation
WOS ID	WOS:000554911700037
Publisher	ELSEVIER
Citation statistics
Document Type	期刊论文
Identifier	http://ir.ipe.ac.cn/handle/122111/41589
Collection	中国科学院过程工程研究所
Corresponding Author	Shen, Fei
Affiliation	1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation GB/T 7714	Zhang, Yan,Shen, Fei,Cao, Weifeng,et al. Hydrophilic/hydrophobic Janus membranes with a dual-function surface coating for rapid and robust membrane distillation desalination[J]. DESALINATION,2020,491:10.
APA	Zhang, Yan,Shen, Fei,Cao, Weifeng,&Wan, Yinhua.(2020).Hydrophilic/hydrophobic Janus membranes with a dual-function surface coating for rapid and robust membrane distillation desalination.DESALINATION,491,10.
MLA	Zhang, Yan,et al."Hydrophilic/hydrophobic Janus membranes with a dual-function surface coating for rapid and robust membrane distillation desalination".DESALINATION 491(2020):10.

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