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Author:

Xie, Songchen (Xie, Songchen.) | Pang, Zhiguang (Pang, Zhiguang.) | Hou, Chunguang (Hou, Chunguang.) | Wong, Ngie Hing (Wong, Ngie Hing.) | Sunarso, Jaka (Sunarso, Jaka.) | Peng, Yuelian (Peng, Yuelian.)

Indexed by:

EI Scopus SCIE

Abstract:

Membrane scaling represents one of the significant challenges for membrane distillation (MD), especially when treating hypersaline brines. This work presents a one-step dip-coating method to develop an omniphobic membrane. The commercial polyvinylidene fluoride (PVDF) hydrophobic porous membranes were immersed into the epoxy acrylic (EA) resin and fluorosilane (1H,1H,2H,2H-Perfluorodecyltrimethoxysilane, PFTS) mixture followed by a heating cross-linking process. EA/PFTS ratio of 1:1 (v/v) gave the best performance regarding surface morphology, surface chemical composition, surface energy, and mechanical property. The resultant PVDF-(EA/PFTS)-1:1 membrane demonstrated excellent wetting resistance and omniphobicity during the penetration of deionized water, 30% and 60% ethanol in water, and kerosene, giving 141°, 124°, 106°, and 116° contact angles, respectively. It also exhibited excellent scaling resistance in concentrating 14.7 mM gypsum solution and actual reverse osmosis (RO) brine. The permeate flux and conductivity were maintained at about 14 kg m−2 h−1 and below 3 μS cm−1, respectively. More than 99% salt rejection (actual RO brine) was achieved during a long-term continuous MD operation for 80 h. The PVDF-(EA/PFTS)-1:1 membrane exhibited excellent anti-scaling and anti-wetting properties. A series of capillary experiments confirmed that the membrane's surface pores achieved the gas-wetting state. The increase in the membrane surface hydrophobicity, the reduction in the surface pore size, and the toughening of the surface pores contributed to the formation of a stable gas-liquid interface on the modified membrane surface that can enhance the anti-scaling and anti-wetting performance. © 2022 Elsevier B.V.

Keyword:

Phase interfaces Deionized water Surface morphology Hydrophobicity Membranes Morphology Distillation Pore size Wetting Fluorine compounds Desalination

Author Community:

  • [ 1 ] [Xie, Songchen]Beijing Key Laboratory for Green Catalysis and Separation, Faculty of Environment and Life, Beijing University of Technology, Beijing; 100124, China
  • [ 2 ] [Pang, Zhiguang]Beijing Key Laboratory for Green Catalysis and Separation, Faculty of Environment and Life, Beijing University of Technology, Beijing; 100124, China
  • [ 3 ] [Hou, Chunguang]Beijing Key Laboratory for Green Catalysis and Separation, Faculty of Environment and Life, Beijing University of Technology, Beijing; 100124, China
  • [ 4 ] [Wong, Ngie Hing]Research Centre for Sustainable Technologies, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, Sarawak, Kuching; 93350, Malaysia
  • [ 5 ] [Sunarso, Jaka]Research Centre for Sustainable Technologies, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, Sarawak, Kuching; 93350, Malaysia
  • [ 6 ] [Peng, Yuelian]Beijing Key Laboratory for Green Catalysis and Separation, Faculty of Environment and Life, Beijing University of Technology, Beijing; 100124, China

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Source :

Journal of Membrane Science

ISSN: 0376-7388

Year: 2022

Volume: 660

9 . 5

JCR@2022

9 . 5 0 0

JCR@2022

ESI Discipline: CHEMISTRY;

ESI HC Threshold:53

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 19

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 7

Affiliated Colleges:

Online/Total:1016/10607204
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