TY - JOUR
T1 - Preparation of Hyflon AD60/PVDF composite hollow fiber membranes for vacuum membrane distillation
AU - Tong, Daqing
AU - Wang, Xiaozu
AU - Ali, Mohammad
AU - Lan, Christopher Q.
AU - Wang, Yong
AU - Drioli, Enrico
AU - Wang, Zhaohui
AU - Cui, Zhaoliang
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2016/1/8
Y1 - 2016/1/8
N2 - Hydrophobic membrane is desired to avoid pore wetting phenomenon in membrane distillation (MD). In the present paper, highly hydrophobic Hyflon AD60/PVDF composite hollow fiber membranes were prepared by coating a copolymer (Hyflon AD60) of tetrafluoroethylene (TFE) and 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole (TTD) on poly(vinylidene fluoride) (PVDF) membranes. The effects of Hyflon AD60 concentration, coating time, heat-treatment temperature and heat-treatment time on the structures and performances of Hyflon AD60/PVDF composite hollow fiber membranes in vacuum membrane distillation (VMD) process were investigated. The results show that the hydrophobicity of PVDF hollow fiber membrane was significantly improved by coating Hyflon AD60. The optimized Hyflon AD60 concentration, coating time, heat-treatment temperature and heat-treatment time were 0.1 wt%, 10-20 min, 40-50 °C and 9 h, respectively. Employing NaCl solution with concentration of 35 g × L-1, under a vacuum of 0.09 MPa and feed temperature of 70 °C, the water flux and salt rejection of the composite hollow fiber membrane in VMD process reached to approximately 10 kg × m-2 × h-1 and higher than 99.9 %, respectively, and kept stable, indicating that Hyflon AD60/PVDF composite membrane is an excellent candidate for operation in VMD operation.
AB - Hydrophobic membrane is desired to avoid pore wetting phenomenon in membrane distillation (MD). In the present paper, highly hydrophobic Hyflon AD60/PVDF composite hollow fiber membranes were prepared by coating a copolymer (Hyflon AD60) of tetrafluoroethylene (TFE) and 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole (TTD) on poly(vinylidene fluoride) (PVDF) membranes. The effects of Hyflon AD60 concentration, coating time, heat-treatment temperature and heat-treatment time on the structures and performances of Hyflon AD60/PVDF composite hollow fiber membranes in vacuum membrane distillation (VMD) process were investigated. The results show that the hydrophobicity of PVDF hollow fiber membrane was significantly improved by coating Hyflon AD60. The optimized Hyflon AD60 concentration, coating time, heat-treatment temperature and heat-treatment time were 0.1 wt%, 10-20 min, 40-50 °C and 9 h, respectively. Employing NaCl solution with concentration of 35 g × L-1, under a vacuum of 0.09 MPa and feed temperature of 70 °C, the water flux and salt rejection of the composite hollow fiber membrane in VMD process reached to approximately 10 kg × m-2 × h-1 and higher than 99.9 %, respectively, and kept stable, indicating that Hyflon AD60/PVDF composite membrane is an excellent candidate for operation in VMD operation.
KW - Composite hollow fiber membrane
KW - Hydrophobic modification
KW - Hyflon AD60
KW - Poly(vinylidene fluoride)
KW - Vacuum membrane distillation
UR - http://www.scopus.com/inward/record.url?scp=84947550582&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2015.11.026
DO - 10.1016/j.seppur.2015.11.026
M3 - 文章
AN - SCOPUS:84947550582
SN - 1383-5866
VL - 157
SP - 1
EP - 8
JO - Separation and Purification Technology
JF - Separation and Purification Technology
ER -