Preparation and characterization of hydrophobic PVDF membranes by vapor-induced phase separation and application in vacuum membrane distillation

Springer Science and Business Media LLC - Tập 20 - Trang 1-15 - 2013
Hongwei Fan1, Yuelian Peng1, Zhehao Li2, Ping Chen3, Qi Jiang4, Shaobin Wang5
1Center of Membrane Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China
2Changchun Gold Research Institute, Changchun, People’s Republic of China
3The Research Institute of Environmental Protection, North China Pharmaceutical Group Corporation, Shijiazhuang, People’s Republic of China
4National Major Science and Technology Program Management Office for Water Pollution Control and Treatment, MEP, Beijing, People’s Republic of China
5Department of Chemical Engineering, Curtin University of Technology, Perth, Australia

Tóm tắt

Hydrophobic symmetric flat-sheet membranes of polyvinylidene fluoride (PVDF) for use in vacuum membrane distillation (VMD) were successfully fabricated by the vapor-induced phase separation (VIPS) method using the double-layer casting process. To avoid the delamination that often occurs in double-layered membranes, the same PVDF polymer was employed in both the upper layer and support layer casting solutions. Solutions with low and high PVDF contents were co-cast as the upper layer and support layer of the membrane that was formed. In the VIPS process, the low PVDF content solution favored the formation of a layer with a porous and hydrophobic surface, whereas the solution with a high PVDF concentration favored the formation of a layer with high mechanical strength. The effect of the vapor-induced time on the morphological properties of the membranes was studied. As the vapor-induced time was increased, the cross-section of the membrane changed from an asymmetrical finger-like structure to a symmetrical sponge-like structure, and the surface of the membrane became rough and porous. The membrane subjected to the longer vapor-induced time also exhibited a higher permeating flux during the VMD process. The best PVDF membrane fabricated in this study had a mean radial pore size of 0.49 μm, and the rough upper surface produced a static contact angle of 145° with water. During the VMD process with a 3.5 wt.% sodium chloride (NaCl) aqueous solution, the best membrane that was fabricated produced a permeating flux of 22.4 kg m−2 h−1 and an NaCl rejection rate of 99.9 % at a feed temperature of 73 °C and a downstream pressure of 31.5 kPa. This performance is comparable to or superior to the performances of most of the flat-sheet PVDF membranes reported in the literature and a polytetrafluoroethylene membrane used in this study.

Tài liệu tham khảo

Felinia E, May May T, Tai-Shung C (2012) Effects of additives on dual-layer hydrophobic–hydrophilic PVDF hollow fiber membranes for membrane distillation and continuous performance. Chem Eng Sci 68:567–578 Khayet M, Cojocaru C (2012) Air gap membrane distillation: desalination, modeling and optimization. Desalination 287:138–145 Young-Deuk K, Kyaw T, Noreddine G, Kim-Choon N (2013) Performance investigation of a solar-assisted direct contact membrane distillation system. J Membr Sci 427:345–364 Khayet M (2010) Experimental design and optimization of asymmetric flat-sheet membranes prepared for direct contact membrane distillation. J Membr Sci 351:234–245 Osman MS, Schoeman JJ, Baratta LM (2010) Desalination/concentration of reverse osmosis and electrodialysis brines with membrane distillation. Desalin Water Treat 24:294–301 Huayan C, Chunrui W, Yue J (2011) Comparison of three membrane distillation configurations and seawater desalination by vacuum membrane distillation. Desalin Water Treat 28:321–327 Bandini S (1992) Separation efficiency in vacuum membrane distillation. J Membr Sci 73:217–229 Bandini S (1997) Vacuum membrane distillation: Experiments and modeling. AICHE J 43:398–408 Bandini S (1999) Heat and mass transport resistances in vacuum membrane distillation per drop. AICHE J 45:1422–1433 Sarti GC (1993) Extraction of organic components from aqueous streams by vacuum membrane distillation. J Membr Sci 80:21–33 Mengual JI (2004) Heat and mass transfer in vacuum membrane distillation. Int J Heat Mass Transf 47:865–75 Li Z, Congjie G (2010) The prospective application of membrane distillation in the metallurgical industry. Membr Technol 5:6–10 Qtaishat M (2009) Preparation and characterization of novel hydrophobic/hydrophilic polyetherimide composite membranes for desalination by direct contact membrane distillation. J Membr Sci 327:264–273 Khayet M (2011) Membranes and theoretical modeling of membrane distillation: a review. Adv Colloid Interf Sci 164:56–88 Khayet M, Matsuura T (2001) Preparation and characterization of polyvinylidene fluoride membranes for membrane distillation. Ind Eng Chem Res 40:5710–5718 Feng CS (2006) Factors affecting pore structure and performance of poly(vinylidene fluoride-co-hexafluoro propylene) asymmetric porous membrane. J Membr Sci 277:55–64 Cheng LP (1994) An improved model for mass transfer during the formation of polymeric membranes by the immersion–precipitation process. J Polymer Sci, Part B: Polymer Phys 32:1413–25 Kao ST (2008) Fabricating PC/PAN composite membranes by vapor-induced phase separation. Desalination 233:96–103 Shin SJ (2005) Preparation and characterization of polyethersulfone microfiltration membranes. Desalination 186:1–10 Tsai HA (2006) Morphology control of polysulfone hollow fiber membranes via water vapor induced phase separation. J Membr Sci 278:390–400 Li XM (2008) A sacrificial-layer approach to prepare microfiltration membranes. J Membr Sci 320:1–7 Yuelian P, Hongwei F, Ju G, Shaobin W, Ping C, Qi J (2012) The effects of processing conditions on the surface morphology and hydrophobicity of polyvinylidene fluoride membranes prepared via vapor-induced phase separation. Appl Surf Sci 263:737–744 Hongwei F, Yuelian P (2012) Application of PVDF membranes in desalination and comparison of the VMD and DCMD processes. Chem Eng Sci 79:94–102 Pereira CC (2001) Membranes obtained by simultaneous casting of two polymer solutions. J Membr Sci 192:11–26 Pereira CC (2003) Hollow fiber membranes obtained by simultaneous spinning of two polymer solutions: a morphological study. J Membr Sci 226:35–50 Smolder K, Franken ACM (1989) Terminology for membrane distillation. Desalination 72:249–262 Qtaishat M (2009) Novel porous composite hydrophobic/hydrophilic polysulfone membranes for desalination by direct contact membrane distillation. J Membr Sci 341:139–48 Jun S, Quan Y, Congjie G (2001) Membrane technical manuals. Chemical Industry Press (CIP), Beijing, p 78 Khayet M (2004) Characterization of membranes for membrane distillation by atomic force microscopy and estimation of their water vapor transfer coefficients in vacuum membrane distillation process. J Membr Sci 238:199–211 Khulbe KC, Matsuura T (2000) Characterization of synthetic membranes by Raman spectroscopy, electron spin resonance and atomic force microscopy: a review. Polymer 41:1917–1935 Khayet M (2001) Modelling transport mechanism through a porous partition. J Non-Equil Thermody 26:1–14 Yuelian P, Hongwei F, Yajun D, Yanna S, Hua H (2012) Effects of exposure time on variations in the structure and hydrophobicity of polyvinylidene fluoride membranes prepared via vapor-induced phase separation. Appl Surf Sci 258:7872–7881 Peng M (2005) Porous poly(vinylidene fluoride) membrane with highly hydrophobic surface. J Appl Polym Sci 98:1358–1363 Xuyun W (2009) Formation mechanism and crystallization of poly(vinylidene fluoride) membrane via immersion precipitation method. Desalination 236:170–78 Stawikowska J, Livingston AG (2013) Assessment of atomic force microscopy for characterisation of nanofiltration membranes. J Membr Sci 425–426:58–70 MMA Shirazi, D Bastani, A Kargari, M Tabatabaei (2013) Characterization of polymeric membranes for membrane distillation using atomic force microscopy. Desalin Water Treat (in press) Khayet M (2000) Theory and experiments on sweeping gas membrane distillation. J Membr Sci 165:261–272 Alklaibi AM, Lior N (2005) Membrane-distillation desalination: status and potential. Desalination 171:111–131 Couffin N (1998) A new process to remove halogenated VOCs for drinking water production: vacuum membrane distillation. Desalination 117:233–245 Cath TY (2004) Experimental study of desalination using direct contact membrane distillation: a new approach to flux enhancement. J Membr Sci 228:5–16 Imdakm AO (2007) A Monte Carlo simulation model for vacuum membrane distillation process. J Membr Sci 306:341–348 Lawson KW, Lloyd DR (1996) Membrane distillation 1. Module design and performance evaluation using vacuum membrane distillation. J Membr Sci 120:111–121 Kai-Yu W, Suay-Wei F, Tai-Shung C (2009) Mixed matrix PVDF hollow fiber membranes with nanoscale pores for desalination through direct contact membrane distillation. Ind Eng Chem Res 48:4474–4483 Mericq JP, Laborie S, Cabassud C (2009) Vacuum membrane distillation for an integrated seawater desalination process. Desalin Water Treat 9:287–296 Feng C (2008) Production of drinking water from saline water by air-gap membrane distillation using polyvinylidene fluoride nanofiber membrane. J Membr Sci 311:1–6 Mohammad Mahdi AS, Kargari A, Mohammad Javad AS (2012) Direct contact membrane distillation for seawater desalination. Desalin Water Treat 49:368–375 Khayet M, Mengual JI, Matsuura T (2005) Porous hydrophobic/hydrophilic composite membranes: application in desalination using direct contact membrane distillation. J Membr Sci 252:101–113 Eumine Suk D, Matsuura T (2010) Development of novel surface modified phase inversion membranes having hydrophobic surface-modifying macromolecule (nSMM) for vacuum membrane distillation. Desalination 261:300–312 Tang N (2010) Preparation and morphological characterization of narrow pore size distributed polypropylene hydrophobic membranes for vacuum membrane distillation via thermally induced phase separation. Desalination 256:27–36
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