Preparation of AOPAN/PA-66 Composite Nanofibers and Its Adsorption of Metal Ion†

doi:10.7503/cjcu20150459

Abstract

Abstract:

A kind of polyacrylonitrile(PAN) nanofibers which was reinforced with nylon(PA-66) fiber was fabricated via twin-spinneret electrospinning technology, then together with hydroxylamine hydrochloride produce oximation reaction to prepare the amidoxime modified polyacrylonitrile/nylon composite nanofibers(AOPAN/PA-66). The composition, morphology and mechanical properties of the nanofibers before and after oximation reaction were characterized by Fourier transform infrared spectroscopy and scanning electron microscope, and the adsorption properties were evaluated with Cu(Ⅱ) and Pb(Ⅱ). The results show that the compound fiber membrane have great mechanical properties with the tensile strength of 4.73 MPa, elongation at break is 30.76% and when the concentration of heavy metal ion is 500 mg/L, the highest adsorption capacity of AOPAN/PA-66 nanofiber membrane for Cu(Ⅱ) and Pb(Ⅱ) are 67.5 and 75.4 mg/g respectively.

Key words: Electrospinning, Amidoxime reaction, Adsorption, Metal ion, Composite nanofibers membrane

CLC Number:

O632.62
O633

TrendMD:

YAN Chunqiu, LIU Bin, LU Guanxiu, LI Yaoxian, YANG Qingbiao, SONG Yan. Preparation of AOPAN/PA-66 Composite Nanofibers and Its Adsorption of Metal Ion^†[J]. Chem. J. Chinese Universities, 2016, 37(1): 189.

Figures/Tables 9

Scheme 1 Oximation reaction route of PAN nanofibers

Fig.1 SEM images of PA-66(A), PAN(B), PAN/PA-66(C) and AOPAN/PA-66 nanofibers(D)

Fig.2 FTIR spectra of PA66(a), PAN(b) and AOPAN/PA-66 nanofiber(c)

Table 1 Mechanical properties of different kinds of nanofibers*

Sample	Amidoximation ratio(%)	Tensile strength/MPa	Elongation(%)
PAN	0	4.83	45.11
PA-66	0	5.22	50.66
AOPAN^[13]	78.8	1.50	15.00
AOPAN^[13]	83.6	N/A	N/A
AOPAN/PA-66	92.4	4.73	30.76

Fig.3 Effect of time on adsorption capacity^ Initial concentration: 500 mg/L; pH=4.7;30 ℃.

Fig.4 Effect of the concentration of heavy metal ion on adsorption capacity^Contact time: 24 h ; pH=4.7; 30 ℃.

Fig.5 Effect of pH on adsorption capacity^Initial concentration: 500 mg/L; contact time: 24 h ; 30 ℃.

Fig.6 Adsorption capacities of copper and plumbum ions onto the AOPAN/PA-66 nanofibers^The initial adsorption amount of heavy metal ions onto the nanofibers(a, c); the last adsorption amount of heavy metal ions onto the nanofibers after five adsorption-desorption cycles(b, d).

Scheme 2 Possible mechanism of AOPAN/PA-66 nanofibers for heavy metal ion adsorption

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