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

doi:10.1016/j.desal.2020.114561

	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
刊名	DESALINATION
	2020-10-01
卷号	491 页码:10
关键词	Hydrophilic coating Janus membrane Membrane distillation Desalination Dual-function coating
ISSN号	0011-9164
DOI	10.1016/j.desal.2020.114561
英文摘要	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.
资助项目	Beijing Natural Science Foundation[8202044]
WOS关键词	COMPOSITE MEMBRANES ; HOLLOW-FIBER ; CARBON NANOTUBES ; FLUX ENHANCEMENT ; PERFORMANCE ; LAYER ; OIL ; PROPERTY ; FABRICATION ; SEPARATION
WOS研究方向	Engineering ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000554911700037
资助机构	Beijing Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/41588]
专题	中国科学院过程工程研究所
通讯作者	Shen, Fei
作者单位	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
推荐引用方式 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.