Fabrication of Dual-layer Hollow Fiber Ceramic Composite Membranes by Co-extrusion

doi:10.15541/jim20200182

Abstract

Abstract:

Hollow fiber ceramic membranes have been widely accepted in membrane separation due to their advantages of high packing density, low transfer resistance and long-period operation. Fabrication of highly-asymmetric hollow fiber membrane is helpful to achieve high flux as well as high rejection simultaneously. In this work, dual-layer hollow fiber ceramic composite membranes were prepared by the co-extrusion method. The inner and outer suspensions were doped with α-Al₂O₃ powders with average particle sizes of 1 μm and 300 nm respectively. Effects of TiO₂ content in inner suspension, Al₂O₃/polyether sulfone (PESf) mass ratio of outer suspension and calcination temperature on structure and properties of membrane were investigated extensively. When the TiO₂ content was 2wt% in inner suspension, the Al₂O₃/PESf mass ratio was 5.60 in outer suspension and the sintering temperature was 1350 ℃, the hollow fiber membrane got the optimum performance, with fracture load of 24 N, average pore size of 0.15 μm, and oil rejection of 97.5%.

Key words: dual-layer hollow fiber, co-extrusion, TiO₂, Al₂O₃/PESf

CLC Number:

TQ174

LIU Jinyun, ZHANG Yuting, HONG Zhou, LIU Hua, WANG Shengxian, GU Xuehong. Fabrication of Dual-layer Hollow Fiber Ceramic Composite Membranes by Co-extrusion[J]. Journal of Inorganic Materials, 2020, 35(12): 1333-1339.

Figures/Tables 11

References 31

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Suspension composition	Inner layer	Outer layer
Solvent (NMP)	33.34	37.81
Al₂O₃ (1 μm)	55.35	/
Al₂O₃ (300 nm)	/	49.15
Polymer (PESf)	9.77	11.34
Additive (PVP)	1.54	1.70

Suspension composition	Inner layer	Outer layer
Solvent (NMP)	33.34	37.81
Al₂O₃ (1 μm)	55.35	/
Al₂O₃ (300 nm)	/	49.15
Polymer (PESf)	9.77	11.34
Additive (PVP)	1.54	1.70

Property	η/%	Fracture load/N	Pure water flux/(m³?m^-2?h^-1)	Porosity/%	Average pore size/μm	R_TOC/%
Single-layer (1 μm)	13.0	9	3.52	51.57	0.70	95.4
Single-layer (300 nm)	16.9	19	0.86	48.20	0.13	98.4
Dual-layer (1 μm/300 nm)	14.3	12	2.30	50.89	0.24	97

Property	η/%	Fracture load/N	Pure water flux/(m³?m^-2?h^-1)	Porosity/%	Average pore size/μm	R_TOC/%
Single-layer (1 μm)	13.0	9	3.52	51.57	0.70	95.4
Single-layer (300 nm)	16.9	19	0.86	48.20	0.13	98.4
Dual-layer (1 μm/300 nm)	14.3	12	2.30	50.89	0.24	97

TiO₂ content/wt%	η/%	Fracture load/N	Pure water flux/ (m³?m^-2?h^-1)	Porosity/%	Average pore size/μm
0	14.3	12	2.30	50.89	0.240
2	14.9	24	1.65	48.05	0.152
5	14.9	22	1.32	49.97	0.147
10	15.2	20	1.21	46.43	0.150
15	15.3	19	1.12	45.68	0.145
20	16.3	17	0.91	43.90	0.141