期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 274, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.117762
关键词
Superhydrophobic membrane; Nonsolvent induced phase inversion; Pre-gelation; Polyvinylidene fluoride (PVDF); Membrane distillation
资金
- National Natural Science Foundation of China [51978466, 51638011]
- Program for Innovative Research Team in University of Tianjin [TD13-5044]
- Science and Technology Plans of Tianjin [18ZYPTJC00010]
Superhydrophobic PVDF membrane with micro-nano structures was prepared by adding NaCl-H2O to the casting solution, leading to high water contact angle and increased DCMD flux. NaCl crystals acted as nuclei, accelerating the crystallization of PVDF chains and forming a stable superhydrophobic structure.
In-situ construction of superhydrophobic polyvinylidene fluoride (PVDF) membrane was prepared through nonsolvent induced phase inversion process for direct contact membrane distillation (DCMD). Saturated sodium chloride aqueous solution (NaCl-H2O) was added to the casting solution as a green phase inversion inducing agent. The variation of polymer crystal and the formation mechanism of micro-nano structure on membrane surface were studied. The results showed that NaCl crystals could act as nucleus for the pre-gelation and crystallization of PVDF chains. The harsh nonsolvent, water, accelerated the gelation process. When the optimum amount of NaCl-H2O was added, superhydrophobic membrane with lotus leaf like micro-nano spherical structure and interconnected channels was obtained. The pure water contact angle reached 155.3 degrees with DCMD flux of 54.5 L/m2 center dot h, which was about 1.6 times for the membrane without NaCl-H2O addition. The stability was also improved owing to the superhydrophobic structure.
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