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Synthesis of magnetic molecularly imprinted polymer particles for selective adsorption and separation of dibenzothiophene

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Abstract

We report on the synthesis of magnetic molecularly imprinted polymers (m-MIPs) for the selective adsorption and separation of dibenzothiophene (DBT) from oil solution. The m-MIPs were characterized by Fourier transform infrared analysis, transmission electron microscopy, surface area and porosity analysis, and vibrating sample magnetometry. Batch mode adsorption studies were carried out to investigate the adsorption kinetics, adsorption isotherms and selective recognition. The adsorption kinetics were modeled with the pseudo-first-order and pseudo-second-order kinetics, and the adsorption isotherms were fitted with Langmuir and Freundlich models. The m-MIPs can selectively recognize DBT over similar compounds. Static adsorption experiments showed that the m-MIPs display excellent recognition capacity, selective affinity for DBT, and superparamagnetism in presence of an external magnetic field.

TEM images of the Fe3O4 (A), Fe3O4@SiO2 (B), Fe3O4@SiO2@MIPs (C) and (D). The morphology of Fe3O4, Fe3O4@SiO2, Fe3O4@SiO2@MIPs was observed by TEM. As can be observed in Fig. 2, the Fe3O4 magnetic nanoparticles (Fig. 2a) had a diameter in the range of 8–16 nm, which indicated the prepared magnetic nanoparticles were superparamagnetic. It could be found from Fig. 2b and c, 2D that all samples displayed spherical shape before and after being encapsulated by silica and MIP. There are significant layers present on the surface of Fe3O4@SiO2, which indicated MIP has been successfully prepared.

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Acknowledgements

This work is subsidized by the National Basic Research Program of China(973 Program, 2012CB821500),National Natural Science Fund (No. 21106056, 21174057, 21044003), Science and Technology Planned Projects for General Administration of Quality Supervision of China (No. 2011IK008), Jiangsu Natural Science Fund of China (No:BK2011512), A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Senior Talent Foundation of Jiangsu University (No. 09JDG048), Scientific Research Foundation of Jiangsu University (No. 10A074,10A091).

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Authors and Affiliations

  1. Department of Environment, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Hui Li, Wanzhen Xu, Xuhai Ma, Bo Jiang, Lukuan Liu & Weihong Huang

  2. Entry-exit inspection quarantine bureau, Zhenjiang, 212000, People’s Republic of China

    Ningwei Wang

  3. Department of Material science & engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Dandan Niu, Wenming Yang & Zhiping Zhou

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  1. Hui Li
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  2. Wanzhen Xu
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  9. Wenming Yang
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  10. Zhiping Zhou
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Correspondence to Wanzhen Xu.

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Li, H., Xu, W., Wang, N. et al. Synthesis of magnetic molecularly imprinted polymer particles for selective adsorption and separation of dibenzothiophene. Microchim Acta 179, 123–130 (2012). https://doi.org/10.1007/s00604-012-0873-7

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  • DOI: https://doi.org/10.1007/s00604-012-0873-7

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