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Chinese Journal of Applied Chemistry    2018, Vol. 35 Issue (5) : 600-608     DOI: 10.11944/j.issn.1000-0518.2018.05.170138
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Preparation and Selective Recognition Property of Magnetic Surface Molecularly Imprinted Polymers with Gallic Acid as Template
DENG Huiyuna,WANG Bina,WU Maoa,WEN Ruizhia,MA Qianga,GUO Yapinga,DENG Binb,XIE Lianwua*()
aInstitute of Applied Chemistry,College of Sciences,Central South University of Forestry and Technology,Changsha 410004,China
bSchool of Chemical Biology and Environmental Engineering, Xiangnan University,Chenzhou,Hu'nan 423043,China
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Hydroxybenzoic acid compounds are used widely and have strong polarity. The separation, purification and analysis of their analogues in complex aqueous solution are very difficult. In this paper, magnetic surface molecularly imprinted polymer(MIP) was prepared using nano magnetic Fe3O4 as the carrier and gallic acid(GA) as the template molecule, and characterized by transmission electron microscopy, infrared spectroscopy and magnetic intensity measurement. Then its adsorption properties and adsorptive selectivity were studied by the static adsorption and dynamic adsorption experiments to compare the adsorption properties of GA on MIP with those of 2,4-dihydroxybenzoic acid, salicylic acid and benzoic acid. The results show that the MIP with GA as the template has a core-shell structure with a strong bonding effect, the adsorption process belongs to Langmuir monolayer adsorption and the adsorption kinetics can satisfy the pseudo-second-order kinetic equation model. The MIP exhibits an excellent selectivity for GA, and its adsorption capacity(37.736 mg/g at 318 K) is much higher than those of other structural analogues. The MIP prepared by this method can not only recognize the template molecule, but also be magnetically controlled. The high separation efficiency is applicable to the solid phase extraction.

Keywords surface molecular imprinting      selective recognition      hydroxybenzoic acid      adsorption      magnetic Fe3O4     
Fund:Supported by the Technology Foundation for Selected Overseas Chinese Scholar of Ministry of Human Resources and Social Security of China(No.2016-176), the Hunan Provincial Key Laboratory Special Foundation of China(No.2014FJ3011, No.2016XGJSYB01, No.2015TP4021-5), the Hu'nan Provincial Colleges and Universities “twelve-five planning” Professional Comprehensive Reform Pilot Project(No.2012-266)
Corresponding Authors: XIE Lianwu     E-mail:
Received: 2017-04-27           Accepted: 2017-07-03
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DENG Huiyun
WU Mao
WEN Ruizhi
MA Qiang
GUO Yaping
XIE Lianwu
Cite this article:   
DENG Huiyun,WANG Bin,WU Mao, et al. Preparation and Selective Recognition Property of Magnetic Surface Molecularly Imprinted Polymers with Gallic Acid as Template[J]. Chinese Journal of Applied Chemistry, 2018, 35(5): 600-608.
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Fig.1Infrared spectra of surface molecularly imprinted polymers under producing process
Fig.2The images of TEM
Fig.3The magnetization curves of Fe3O4 nanoparticle and MIP. Inset:the magnetic separation of MIP under the external magnetic field
Fig.4The static adsorption curves of MIP
Fig.5The static adsorption curves of NIP
Fig.6Static adsorption analysis of MIP by Scatchard model
T/K Langmuir model Freundlich model
Qm(cal)/(mg·g-1) R2 KL n R2 Kf
298 MIP 34.843 0.998 3.827 3.053 0.914 23.661
NIP 3.516 0.996 4.998 4.074 0.901 2.692
308 MIP 36.496 0.996 4.807 3.171 0.915 26.182
NIP 3.998 0.998 5.276 4.302 0.885 3.083
318 MIP 37.736 0.994 5.761 3.379 0.892 28.030
NIP 4.361 0.998 5.525 4.486 0.865 3.386
Table 1Parameters of Langmuir equation and Freundlich equation
Fig.7The adsorption kinetics curves of MIP and NIP
Items Qe(exp)/(mg·g-1) Pseudo-first-order Pseudo-second-order
R2 K1/min-1 Qe(cal)/(mg·g-1) R2 K2/(g·mg-1·min-1) Qe(cal)/(mg·g-1)
MIP 34.830 0.978 0.042 32.911 0.996 0.002 36.232
NIP 3.302 0.996 0.089 3.254 0.999 0.110 3.342
Table 2Simulation parameters of pseudo first-order and pseudo two-order kinetic equations(318 K)
Fig.8Selective recognition of MIP with GA as template and NIP
Fig. Selective recognition of MIP with SA as template and NIP
Fig.10HPLC of GA standard solution(a) and dark tea soup before(b) and after(c) adsorption of GA by MIP
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