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

Jinyun LIU; Yuting ZHANG; Zhou HONG; Hua LIU; Shengxian WANG; Xuehong GU

doi:10.15541/jim20200182

Journals >Journal of Inorganic Materials >Volume 35 >Issue 12 >Page 1333 > Article

Journal of Inorganic Materials
Vol. 35, Issue 12, 1333 (2020)

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

Jinyun LIU, Yuting ZHANG, Zhou HONG, Hua LIU, Shengxian WANG, and Xuehong GU^*

Author Affiliations

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

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DOI: 10.15541/jim20200182 Cite this Article

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

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SEM images of dual-layer hollow fiber and single-layer hollow fiber Cross-section morphologies of (a, b) dual-layer hollow fiber precursor, (c, d) dual-layer hollow fiber, (e, f) 1 μm single-layer hollow fiber; SEM images of the surface morphology: (g) dual-layer hollow fiber, (h) 1 μm single-layer hollow fiber

1. SEM images of dual-layer hollow fiber and single-layer hollow fiber Cross-section morphologies of (a, b) dual-layer hollow fiber precursor, (c, d) dual-layer hollow fiber, (e, f) 1 μm single-layer hollow fiber; SEM images of the surface morphology: (g) dual-layer hollow fiber, (h) 1 μm single-layer hollow fiber

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XRD patterns of dual-layer hollow fiber membranes with different TiO2 contents

2. XRD patterns of dual-layer hollow fiber membranes with different TiO₂ contents

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3. SEM images of dual-layer hollow fiber membranes with different Al₂O₃/PESf mass ratios in outer suspension (a) 2.75; (b) 4.33; (c) 5.60; (d) 7.50; (e) 13.3

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4. Influence of Al₂O₃/PESf mass ratio in outer suspension on pore size distribution of dual-layer hollow fiber membranes

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5. SEM images of dual-layer hollow fiber membrane of alumina sintered at different temperatures (a)1250 ℃, (b)1300 ℃, (c) 1350 ℃, (d)1400 ℃

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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

Table 1. Suspension composition of dual-layer hollow fiber membrane/wt%

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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

Table 2. Comparison of properties between single-layer and dual-layer hollow fiber membranes

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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

Table 3. Influence of TiO₂ content on properties of dual-layer hollow fiber membranes

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Al₂O₃/PESf	Outer suspension viscosity/cP	Fracture load/N	Pure water flux/(m³‧m^-2‧h^-1)	Porosity/%	Mean pore size/μm	R_TOC/%
2.75	7320	21	1.99	49.90	0.180	97.3
4.33	8580	22	1.10	52.26	0.175	97.5
5.60	9720	23	1.41	53.91	0.130	97.5
7.50	11020	25	1.08	53.31	0.125	97.6
13.30	58300	23	0.48	52.54	0.115	97.8

Table 4. Influence of Al₂O₃/PESf mass ratio in outer suspension on properties of dual-layer hollow fiber membranes

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Temperature/℃	Fracture load/N	Pure water flux/(m³‧m^-2‧h^-1)	Porosity/%	Average pore size/μm	R_TOC/%
1250	11	3.23	61.97	0.235	96.7
1300	15	2.34	55.62	0.199	97.4
1350	24	1.20	48.88	0.150	97.5
1400	37	0.26	40.33	0.126	98.3

Table 5. Influence of sintering temperature on the properties of dual-layer hollow fiber membranes

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Membranes	Sintering temperature/℃	Average pore size/μm	Pure water flux/ (m³‧m^-2‧h^-1)	Bending strength/MPa	Fracture load/N	Ref.
Single-Channel Al₂O₃ hollow fiber	1455	0.10	0.664	88.2	-	[28]
Single-Channel Al₂O₃ hollow fiber	1500	0.75	1.280	85.8	-	[29]
4-Channel Al₂O₃ hollow fiber	1500	1.20	2.710	-	22	[25]
7-Channel Al₂O₃ hollow fiber	1350	0.183	1.070	-	14	[30]
7-Channel YSZ/Al₂O₃ hollow fiber	1400	230.00	1.640	-	14	[31]
4-Channel 1 μm/300 nm Al₂O₃ hollow fiber	1350	0.15	1.260	-	24	This work

Table 6. Comparison in properties of different hollow fiber ceramic membranes

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