期刊
WATER RESEARCH
卷 155, 期 -, 页码 152-161出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2019.01.036
关键词
Micromolding phase separation; Surface pattern; Slippery; Membrane distillation; Scaling; Membrane
资金
- Newton Advanced Fellowship [NA170113]
- National Natural Science Foundation of China [U1507117, 21676290, 51861145313]
- EPSRC [EP/J009121/1] Funding Source: UKRI
- NERC [NE/P003826/1] Funding Source: UKRI
Scaling in membrane distillation (MD) is a key issue in desalination of concentrated saline water, where the interface property between the membrane and the feed become critical. In this paper, a slippery mechanism was explored as an innovative concept to understand the scaling behavior in membrane distillation for a soluble salt, NaCl. The investigation was based on a novel design of a superhydrophobic polyvinylidene fluoride (PVDF) membrane with micro-pillar arrays (MP-PVDF) using a micromolding phase separation (mu PS) method. The membrane showed a contact angle of 166.0 +/- 23 degrees and the sliding angle of 15.8 +/- 3.3 degrees. After CF4 plasma treatment, the resultant membrane (CF4-MP-PVDF) showed a reduced sliding angle of 3.0 degrees. In direct contact membrane distillation (DCMD), the CF4-MP-PVDF membrane illustrated excellent anti-scaling in concentrating saturated NaCl feed. Characterization of the used membranes showed that aggregation of NaCl crystals occurred on the control PVDF and MP-PVDF membranes, but not on the CF4-MP-PVDF membrane. To understand this phenomenon, a slippery theory was introduced and correlated the sliding angle to the slippery surface of CF4-MP-PVDF and its anti-scaling property. This work proposed a well-defined physical and theoretical platform for investigating scaling problems in membrane distillation and beyond. (C) 2019 Elsevier Ltd. All rights reserved.
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