Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 1-6.doi: 10.13475/j.fzxb.20180803306

• Fiber Materials •     Next Articles

Preparation and properties of polyvinylidene fluoride photothermal nanofiber membrane

GAO Shangpeng1,2, HUANG Qinglin1,2(), DAI Wei1,2, XIAO Changfa1   

  1. 1. State Key Laboratory of Separation Membrane and Membrane Processes, Tianjin Polytechnic University,Tianjin 300387, China
    2. School of Material Science and Engineering,Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-08-13 Revised:2019-04-30 Online:2019-08-15 Published:2019-08-16
  • Contact: HUANG Qinglin E-mail:huangqinglin@tjpu.edu.cn

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Abstract:

In order to solve the problem of the decrease in the membrane permeate flux caused by temperature polarization in the process of vacuum membrane distillation (VMD), polyvinylidene fluoride (PVDF) was used as a membrane-forming polymer, and functional antimony doped tin oxide (ATO) with the infrared-induced thermal effect was introduced. PVDF/ATO nanofiber membranes were prepared by electrospinning and then subjected to heat pressing treatment to optimize the fiber structure and pore size. Then, the influences of ATO addition and heat pressing temperature on the morphologies and properties of the membranes were investigated. The results show that the PVDF/ATO nanofiber membrane has better physical properties after heat pressing treatment at 170 ℃. When the ATO addition amount is 3%, the surface temperature of the PVDF/ATO nanofiber membrane increases by 40 ℃ after infrared irradiation for 120 s, the permeate flux of VMD increases from 12 L/(m 2·h) to 22 L/(m 2·h), and the salt rejection remains above 99% during the operation for 5 h.

Key words: electrospinning, polyvinylidene fluoride/antimony doped tin oxide nanofiber membrane, heat pressing treatment, temperature polarization, membrane distillation performance

CLC Number: 

  • TQ340.47

Fig.1

Experimental apparatus for vacuum membrane distillation"

Fig.2

SEM images of electrospun PVDF membrane under different heat press temperatures. (a) Untreated membrane surface;(b) Untreated membrane cross section; (c) 160 ℃ heat press surface;(d) 160 ℃ heat press cross section;(e) 170 ℃ heat press surface; (f) 170 ℃ heat press cross section; (g) 180 ℃ heat press surface; (h) 180 ℃ heat press cross section"

Tab.1

Performance of PVDF membranes under different heat press temperatures"

热压处理
温度/℃		 厚度/
μm		 孔隙率/
%		 接触角/
(°)		 断裂强度/
MPa
未处理 158 83.3 134.3±2.1 5.32±1.17
160 96 66.5 133.7±2.3 8.56±1.50
170 77 57.8 134.0±1.8 9.09±1.22
180 56 10.3 108.7±2.7 13.6±1.32

Fig.3

SEM images of PVDF/ATO nanofiber membrane"

Tab.2

Performance of PVDF/ATO membranes"

纤维膜 接触角/
(°)		 孔隙率/
%		 液体渗透压/
MPa		 断裂强度/
MPa
M-0 133.5±1.1 57.8 0.15±0.02 9.09±1.22
M-1 132.1±0.9 63.2 0.16±0.01 8.62±0.86
M-3 129.8±1.5 62.6 0.17±0.02 8.07±1.34
M-5 127.4±2.1 61.2 0.15±0.03 6.94±1.04

Fig.4

Effect of infrared irradiation on PVDF/ATO membrane surface temperature"

Fig.5

Optical absorption of PVDF/ATO membrane"

Fig.6

Permeate flux and rejection of PVDF/ATO fiber membrane"

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