AOPAN/PA-66复合纳米纤维膜的制备及对金属离子的吸附性能

doi:10.7503/cjcu20150459

摘要/Abstract

摘要：

采用双喷头电纺丝技术, 将尼龙(PA-66)纤维增强的聚丙烯腈(PAN)纳米纤维膜(PAN/PA-66)与盐酸羟胺进行偕胺肟化反应, 制备了一种偕胺肟化聚丙烯腈/尼龙复合纳米纤维膜(AOPAN/PA-66). 通过红外光谱及扫描电子显微镜等方法研究了偕胺肟化前后纳米纤维膜的组成、形貌和力学性能; 并考察了AOPAN/PA-66复合纳米纤维膜对铜离子和铅离子的吸附性能. 结果表明, AOPAN/PA-66复合纳米纤维膜的抗拉伸强度及断裂伸长率分别为4.73 MPa和30.76%, 对Cu(Ⅱ)及Pb(Ⅱ)的吸附量分别为67.5和75.4 mg/g.

关键词: 静电纺丝, 偕胺肟化反应, 吸附, 金属离子, 复合纳米纤维膜

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

中图分类号:

O632.62
O633

TrendMD:

闫春秋, 刘斌, 鲁冠秀, 李耀先, 杨清彪, 宋岩. AOPAN/PA-66复合纳米纤维膜的制备及对金属离子的吸附性能. 高等学校化学学报, 2016, 37(1): 189.

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^†. Chem. J. Chinese Universities, 2016, 37(1): 189.

图/表 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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