Preparation and Application of Magnetic Bisphenol A Imprinted Polymers with Binary Functional Monomers†

doi:10.7503/cjcu20140764

Abstract

Abstract:

A kind of magnetic molecularly imprinted polymers(mag-MIPs) was synthesized by heated polymerization technique using bisphenol A(BPA) as template, β-cyclodextrin(β-CD) and 4-vinylpyridine(4-VP) as the binary functional monomers. The mag-MIPs were characterized by means of transmission electron microscopy(TEM), Fourier transform infrared spectroscopy(FTIR) and vibrating sample magnetometer(VSM). Adsorption experiments indicated that the mag-MIPs prepared with β-CD and 4-VP exhibited high selectivity toward BPA. The performance of the mag-MIPs used as magnetic solid-phase extraction(M-SPE) sorbent was evaluated, and the results showed that it could selectively extract BPA from water samples. The imprinted magnetic solid-phase extraction method has been applied for preconcentration and purification of BPA from water samples with the recoveries range of 90.51%—98.21%.

Key words: Magnetic molecularly imprinted, Bisphenol A, High-performance liquid chromatography, Solid phase extraction

CLC Number:

O652.6

TrendMD:

RAO Wei, YIN Yuli, LONG Fang, ZHANG Zhaohui. Preparation and Application of Magnetic Bisphenol A Imprinted Polymers with Binary Functional Monomers^†[J]. Chem. J. Chinese Universities, 2015, 36(3): 449.

Figures/Tables 10

Table 1 Components for the preparation of molecularly imprinted polymers

Polymer	Fe₃O₄@SiO₂/mg	BPA/mmol	4-VP/mmol	β-CD/mmol	EGDMA/mmol
mag-MIPs	200	1.0	2.0	1.0	10.0
mag-MIPs₁	200	1.0	2.0		10.0
mag-MIPs₂	200	1.0		1.0	10.0
mag-NIPs	200		2.0	1.0	10.0

Fig.1 Protocol for synthesis of mag-MIPs

Fig.2 Adsorption kinetic isotherms(A), adsorption isotherms(B) of the polymers and the langmuir plot of mag-MIPs(C)

Fig.3 TEM images of Fe3O4(A) and mag-MIPs(B)

Fig.4 FTIR spectra of Fe3O4(a), Fe3O4@SiO2(b) and mag-MIPs(c)

Fig.5 Hysteresis loops of Fe3O4(a) and mag-MIPs(b)

Fig.6 Selective adsorption capacities of mag-MIPs(a), mag-MIPs1(b), mag-MIPs2(c) and mag-NIPs(d)

Table 2 Recoveries of BPA eluted with different amounts of acetic acid in methanol solution

V(Methanol): V(Acetic acid)	5:5	6:4	8:2	9:1
Recovery of mag-MIPs(%)	78.51	82.62	87.65	95.21
Recovery of mag-NIPs(%)	19.02	18.79	20.40	21.53

Fig.7 Liquid chromatograms of BPA standard solution in rain water(a), extracted solution(b) and eluate(c)

Table 3 Recoveries of BPA at different spiked levels in aqueous solution

Sample	Added/(ng·mL^-1)	Recovery(%)	RSD(%, n=5)
Rain water	10.0	90.60	3.1
	50.0	92.43	2.8
	100.0	93.07	4.2
River water	10.0	96.31	3.0
	50.0	94.27	3.2
	100.0	91.52	3.1
Lake water	10.0	98.21	2.9
	50.0	90.51	3.2
	100.0	95.23	3.0

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