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Bicontinuous and cellular structure design of PVDF membranes by using binary solvents for the membrane distillation process.

  • Academic Journal
  • Wang Z; School of Environmental Science and Engineering, Southern University of Science and Technology 1088 Xueyuan Blvd, Nanshan District Shenzhen 518055 P. R. China tangyy@sustc.edu.cn.; School of Chemical Engineering and Technology, Nankai University Tianjin 300072 China.
    Tang Y; School of Environmental Science and Engineering, Southern University of Science and Technology 1088 Xueyuan Blvd, Nanshan District Shenzhen 518055 P. R. China tangyy@sustc.edu.cn.
    Li B; Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University Tianjin 300354 China.; Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300354 China.
  • RSC advances [RSC Adv] 2018 Jul 13; Vol. 8 (44), pp. 25159-25167. Date of Electronic Publication: 2018 Jul 13 (Print Publication: 2018).
  • English
  • With excellent permeability as the foremost requirement for membranes used in the membrane distillation (MD) process, the thermally induced phase separation (TIPS) method is a promising approach for preparing porous membranes with a bicontinuous structure, which is identified as the best morphology for permeation. The structure design of membranes prepared by the TIPS process can be strengthened when a binary solvent is introduced in the casting solution. In this work, the determination principles for binary solvent were explicated in detail, and further employed for the selection of binary solvent for the fabrication of polyvinylidene fluoride (PVDF) membrane with different structures. By the TIPS approach, the porous PVDF hollow fiber membranes with cellular structure were generated by g-butyrolactone (GBL)/dioctyl phthalate (DOP) and GBL/dioctyl adipate (DOA) binary solvents, while the membrane with a bicontinuous structure was produced from GBL/dioctyl sebacate (DOS) binary solvent. The phase diagram was used to explain a feasible mechanism for the formation of the porous structures above. When the morphologies and properties of the membranes were characterized and compared, the membrane with a bicontinuous structure rather than a cellular structure was identified as the potential structure for MD processes with much higher tensile strength, narrower pore size distribution, higher MD flux and excellent long-term performance.
    Competing Interests: There are no conflicts to declare.
    (This journal is © The Royal Society of Chemistry.)
Additional Information
Publisher: Royal Society of Chemistry Country of Publication: England NLM ID: 101581657 Publication Model: eCollection Cited Medium: Internet ISSN: 2046-2069 (Electronic) Linking ISSN: 20462069 NLM ISO Abbreviation: RSC Adv Subsets: PubMed not MEDLINE
Original Publication: Cambridge [England] : Royal Society of Chemistry, [2011]-
Water Res. 2011 Nov 1;45(17):5489-500. (PMID: 21899872)
Date Created: 20220511 Latest Revision: 20220512
20220908
PMC9082393
10.1039/c8ra02692k
35542127

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