Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (01): 1-7.doi: 10.13475/j.fzxb.20180710007

• Fiber Materials •     Next Articles

Preparation of sulfonated polyacrylonitrile nanofiber membranes and adsorption capacity for Cr(VI) and Pb(II)

WANG Jie1, WANG Bin1,2,3(), DU Zongxi1, LI Congju4, LI Xiuyan1, AN Boru1   

  1. 1. School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
    2. Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing 100029, China
    3. Beijing Engineering Research Center of Textile Nanofibers, Beijing 100029, China
    4. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2018-07-31 Revised:2019-10-27 Online:2020-01-15 Published:2020-01-14
  • Contact: WANG Bin E-mail:20150010@bift.edu.cn

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Abstract:

In order to better adsorb Cr(VI) and Pb(II) in water and avoid secondary water pollution by the adsorpting materials, polyacrylonitrile electrospun nanofiber membrane (PAN ENM) was chemically modified by reacting with p-toluenesulfonamide through the hydrothermal method, and the modified PAN ENM with the function of adsorbing heavy metal ions was successfully obtained. The removal performance and mechanism of the modified PAN ENM for adsorbing Cr(VI) and Pb(II) were studied. The results show that well-formed modified PAN ENM can be obtained through hydrothermal reaction at 125 ℃ for 2.5 h. The adsorption behavior of the modified PAN ENM for Cr(VI) conformed to the Langmuir model and the pseudo-second-order kinetics. The equilibrium adsorption was reached in 1 h and the adsorption capacity reached 220.4 mg/g in a 50 mg/L K2Cr2O7 solution. The adsorption for Pb(II) fits well to the Freundlich model and the pseudo-second-order kinetics. The equilibrium adsorption is achieved in 1 h and the adsorption capacity is 185.6 mg/g in a 50 mg/L Pb(NO3)2 solution.

Key words: electrospinning, polyacrylonitrile, sulfamation, adsorption behavior, sewage treatment

CLC Number: 

  • TQ340.9

Fig.1

Reaction of p-toluenesulfonamide with nitrile group of PAN"

Fig.2

SEM images of sulfonated PAN ENM with different hydrothermal time (×5 000). (a) Unmodified treatment;(b) Hydrothermal time 1 h;(c) Hydrothermal time 2 h;(d) Hydrothermal time 2.5 h;(e) Hydrothermal time 3 h;(f) Hydrothermal time 4 h"

Fig.2

SEM images of sulfonated PAN ENM with different hydrothermal time (×5 000). (a) Unmodified treatment;(b) Hydrothermal time 1 h;(c) Hydrothermal time 2 h;(d) Hydrothermal time 2.5 h;(e) Hydrothermal time 3 h;(f) Hydrothermal time 4 h"

Fig.3

Diameter distribution of PAN nanofibers membrane before (a) and after (b) sulfamation"

Fig.3

Diameter distribution of PAN nanofibers membrane before (a) and after (b) sulfamation"

Fig.4

Contact angle of PAN nanofiber membrane before and after sulfamation. (a) PAN nanofiber membrane; (b) Sulfonated PAN nanofiber membrane"

Fig.4

Contact angle of PAN nanofiber membrane before and after sulfamation. (a) PAN nanofiber membrane; (b) Sulfonated PAN nanofiber membrane"

Fig.5

FT-IR spectra for sulfonate PAN ENM with different hydrothermal time"

Fig.5

FT-IR spectra for sulfonate PAN ENM with different hydrothermal time"

Fig.6

Change of adsorption performance of sulfonate PAN nanofiber membrane for Cr(VI) (a) and Pb(II) (b) with time"

Fig.6

Change of adsorption performance of sulfonate PAN nanofiber membrane for Cr(VI) (a) and Pb(II) (b) with time"

Fig.7

Fitting plots for Cr(VI) and Pb(II) by pseudo-first-order kinetics and the pseudo-second-order kinetics. (a) Kinetics fitting diagram of quasi-first-order adsorption Cr(VI); (b) Kinetics fitting diagram of quasi-secondary adsorption Cr(VI); (c) Kinetic fitting diagram of quasi first order adsorption Pb(II); (d) Kinetic fitting diagram of quasi-second order adsorption Pb(II)"

Fig.7

Fitting plots for Cr(VI) and Pb(II) by pseudo-first-order kinetics and the pseudo-second-order kinetics. (a) Kinetics fitting diagram of quasi-first-order adsorption Cr(VI); (b) Kinetics fitting diagram of quasi-secondary adsorption Cr(VI); (c) Kinetic fitting diagram of quasi first order adsorption Pb(II); (d) Kinetic fitting diagram of quasi-second order adsorption Pb(II)"

Tab.1

Adsorption kinetics of the modified PAN ENM for Cr(VI) and Pb(II)"

吸附离子 准一级动力学吸附方程 准二级动力学吸附方程
qe1/(mg·g-1) k1/min-1 R12 qe2/(mg·g-1) k2/(g·mg-1·min-1) R22
Cr(VI) 214.86 0.09 0.972 295.85 8.67×10-4 0.995
Pb(II) 175.91 0.05 0.978 248.76 2.10×10-4 0.984

Tab.1

Adsorption kinetics of the modified PAN ENM for Cr(VI) and Pb(II)"

吸附离子 准一级动力学吸附方程 准二级动力学吸附方程
qe1/(mg·g-1) k1/min-1 R12 qe2/(mg·g-1) k2/(g·mg-1·min-1) R22
Cr(VI) 214.86 0.09 0.972 295.85 8.67×10-4 0.995
Pb(II) 175.91 0.05 0.978 248.76 2.10×10-4 0.984

Fig.8

Isothermal curves of sulfonated PAN nanofiber membrane for Cr(VI) and corresponding adsorption model fitting diagrams. (a) Isothermal adsorption curve; (b) Fitting diagram of Langmuir adsorption model; (c)Fitting diagram of Freundlich adsorption model"

Fig.8

Isothermal curves of sulfonated PAN nanofiber membrane for Cr(VI) and corresponding adsorption model fitting diagrams. (a) Isothermal adsorption curve; (b) Fitting diagram of Langmuir adsorption model; (c)Fitting diagram of Freundlich adsorption model"

Fig.9

Isothermal curves of sulfonated PAN nanofiber membrane for Pb(II) and corresponding adsorption model fitting diagrams."

Fig.9

Isothermal curves of sulfonated PAN nanofiber membrane for Pb(II) and corresponding adsorption model fitting diagrams."

Fig.10

Infrared spectra of modified PAN nanofiber membrane before and after adsorption heavy metal ions"

Fig.10

Infrared spectra of modified PAN nanofiber membrane before and after adsorption heavy metal ions"

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