Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 1-7.doi: 10.13475/j.fzxb.20180806707

• Fiber Materials •     Next Articles

Electrospun poly(tetrafluoroethylene)/TiO2 photocatalytic nanofiber membrane and its application

ZHANG Mengyuan1,2, HUANG Qinglin1,2(), HUANG Yan1,2, XIAO Changfa1   

  1. 1. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
    2. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2018-08-27 Revised:2019-05-09 Online:2019-09-15 Published:2019-09-23
  • Contact: HUANG Qinglin E-mail:huangqinglin@tjpu.edu.cn

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Abstract:

In order to solve the difficult recovery of photocatalyst titanium dioxide (TiO2) and unstable performance of the conventional carrier materials, poly(tetrafluoroethylene) (PTFE) was used as a stable TiO2 carrier, and polyvinyl alcohol (PVA) was used as the spinning carrier. The PTFE/PVA/TiO2 precursor fiber membrane was obtained by emulsion electrospinning, and then the PTFE/TiO2 photocatalytic nanofiber membrane was obtained after sintering. The effects of the amount of titanium dioxide on the structure and properties of the membranes were investigated by membrane morphology observation, pore size, porosity and hydrophobicity. The results show that with the increase of TiO2 solid content, the uniformity of membrane fiber diameter decreases and the pore size increases. The membrane was used in vacuum membrane distillation experiment. The flux is up to 35 L/(m2·h) and the desalination rate is over 99.98%. At the same time, the membrane was used for photocatalytic degradation of methylene blue dye aqueous solution (concentration of 10 mg/L). The degradation ratio reaches 99% after 5 h UV irradiation. After reuse, PTFE/titanium dioxide nanofiber membranes still maintain good membrane structure and photocatalytic performance.

Key words: poly(tetrafluoroethylene), titanium dioxide, electrospinning, photocatalysis, vacuum membrane distillation

CLC Number: 

  • TQ342.71

Tab.1

Sample names of membranes"

TiO2质量分数/% 初生纤维膜名称 烧结纤维膜名称
0.0 M-p0 M-s0
2.5 M-p1 M-s1
5.0 M-p2 M-s2
7.5 M-p3 M-s3
10.0 M-p4 M-s4

Fig.1

Schematic diagram of electrospinning apparatus 1—注射器; 2—PAN纺丝液; 3—PTFE/PVA/TiO2纺丝液;4—喷丝头; 5—纤维膜; 6—接收装置; 7—高压电源。"

Fig.2

Testing device for determining LEP of membrane 1—驱动泵; 2—纤维膜; 3—压力计;4—压力调节阀; 5—水。"

Fig.3

Curves of rheological properties. (a) Influence of TiO2 content on η-γ curve;(b) Influence of TiO2 content on σ-γ curve"

Tab.2

Non-Newtonian index of spinning solutions"

TiO2质量分数/% 非牛顿指数n
0.0 0.826 35
2.5 0.878 33
5.0 0.991 02
7.5 1.002 00
10.0 1.060 23

Fig.4

Morphologies of nascent and sintered membranes"

Tab.3

Properties of PTFE/TiO2 membranes"

样品名称 粗糙度/nm 比表面积/(m2·g-1) 接触角/(°)
M-s0 0.634 4.222 148.90±2.0
M-s1 0.972 4.695 144.50±1.9
M-s2 1.119 5.414 144.00±2.3
M-s3 1.274 6.967 143.46±1.0
M-s4 1.313 5.707 142.67±4.3

Tab.4

Properties of PTFE/TiO2 membranes"

样品名称 孔隙率/
%		 平均孔径/
nm		 液体渗透压/
MPa		 断裂强度/
MPa
M-s0 63.2±0.3 580±4 0.14±0.02 2.83±0.25
M-s1 65.0±0.2 802±5 0.11±0.01 1.53±0.19
M-s2 69.5±0.3 900±3 0.09±0.01 1.11±0.27
M-s3 79.8±0.2 1 050±10 0.08±0.01 1.03±0.15
M-s4 64.6±0.1 1 460±10 0.05±0.02 0.99±1.08

Fig.5

Distillation performance of fiber membranes"

Fig.6

Morphology of PTFE/TiO2 fiber membranes before(a)and after(b)photocatalysis"

Fig.7

Efficiency of photocatalytic degradation of MB using PTFE/TiO2membranes"

Fig.8

Stability of PTFE/TiO2 membranes after several photocatalytic cycles"

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