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| Preparation and Spectroscopy Characterization of Magnetic Pb(Ⅱ)-Ion Surface Imprinted Polymers(Fe3O4/GO-IIP) |
| HU Wen-hua, DONG Jun, CHI Zi-fang*, REN Li-ming |
| Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China |
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Abstract Adsorption is widely used in heavy metals wastewater treatments because of its economy and efficiency. Developing recyclable specific Pb(Ⅱ) adsorption materials is important for lead wastewater treatment and lead recycling. Fe3O4/GO-IIP, with properties of adsorb ability (GO) and magnetism (Fe3O4), was successfully synthesized combined with surface imprinting technology by using magnetic Fe3O4/GO as supporter, lead nitrate as a template, methylacrylic acid as functional monomer, and ethylene glycol dimethacrylate as the cross-linker. The reusability and specific adsorption for Pb(Ⅱ) of Fe3O4/GO-IIP were discussed. X-ray diffraction(XRD), scanning electron microscope(SEM) and Fourier transform infrared spectroscopy(FTIR) were used to determine the characteristics of Fe3O4/GO-IIP and analyze the removal mechanism for Pb(Ⅱ). Fe3O4/GO-IIP was used as sorbents to selectively remove Pb(Ⅱ) from aqueous solutions. Results indicated that Fe3O4/GO-IIP had a high affinity to Pb(Ⅱ), the removal rate of Pb(Ⅱ) reached 70% within 5 minutes and the reaction achieved adsorption equilibrium within 20 minutes. Pseudo second order kinetics and Langmuir isotherm adsorption model could preferably express the adsorption process. Transmission electron microscopy(TEM) and SEM images demonstrated that Fe3O4 was uniformly loaded on the surface of GO, and the size rang was from 10 to 20 nm. The imprinted cavity existing on the surface of Fe3O4/GO-IIP enhanced the selective adsorption of Pb(Ⅱ). The selectivity coefficient of Fe3O4/GO-IIP was 2～5 times higher than that of Fe3O4/GO-NIP in the presence of competitive ions [Cd(Ⅱ), Zn(Ⅱ), Cu(Ⅱ) and et al]. XRD and FTIR spectra confirmed the synthesis of Fe3O4/GO-IIP.Fe3O4/GO-IIP and exhibited favorable characteristics of re-utilizing.
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Received: 2016-11-29
Accepted: 2017-04-18
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Corresponding Authors:
CHI Zi-fang
E-mail: chizifang@jlu.edu.cn
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