Preparation of multi-walled carbon nanotubes based magnetic multi-template molecularly imprinted polymer for the adsorpt
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RESEARCH ARTICLE
Preparation of multi-walled carbon nanotubes based magnetic multi-template molecularly imprinted polymer for the adsorption of phthalate esters in water samples Dongli Deng 1,2 & Yingnan He 1 & Mingyuan Li 1 & Ludan Huang 1 & Jinzhong Zhang 1 Received: 12 May 2020 / Accepted: 21 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Taking the advantages of surface imprinting, multi-template imprinting and magnetic separation, a novel magnetic multitemplate molecularly imprinted polymer (mag-MMIP@MWCNTs) was prepared by using MWCNTs as support material, Fe3O4 as magnetic core, and dimethyl phthalate (DMP), diethyl phthalate (DEP), and dibutyl phthalate (DBP) as template molecules. This composite was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), and the Brunauer-Emmett-Teller (BET) analysis, and was used for the simultaneous adsorption of DMP, DEP, and DBP in aqueous solution. The effects of solution pH, contact time, PAEs initial concentration, temperature, adsorption selectivity, and reusability were investigated and discussed in detail. The results demonstrated that mag-MMIP@MWCNTs exhibited fast kinetics, good magnetic separation, and excellent selectivity for the adsorption of three phthalate esters (PAEs). The adsorption kinetics followed pseudo second-order kinetic model and the adsorption thermodynamics followed Langmuir isothermal model very well, and the maximum adsorption capacities (Qmax) of DMP, DEP, and DBP were obtained as 0.95, 1.38, and 7.09 mg g-1, respectively. The Scatchard analysis revealed that the template-polymer system had a two-site binding behavior. The adsorption thermodynamic studies indicated that the adsorption processes were exothermic and spontaneous, and dominated by physical adsorption relying on hydrogen bond, hydrophobic interaction, and van der Waals force. Mag-MMIP@MWCNTs also showed good reproducibility and reusability for simultaneous adsorption of the three PAEs. The potential application of mag-MMIP@MWCNTs was proved by the removal of DMP, DEP, and DBP spiked in environmental water samples. Keywords Magnetic molecularly imprinted polymer . Multi-template . Phthalate esters . Simultaneous adsorption . Environmental water samples
Introduction Responsible Editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10970-2) contains supplementary material, which is available to authorized users. * Jinzhong Zhang [email protected] 1
College of Resources and Environment, Southwest University, Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400715, People’s Republic of China
2
Chemical Pollution Control and Applied Technology Extension Center of Chongqing Higher Vocational Colleges, Chongqing Industry, Polytechnic College, Chongqing 401120, People’s Republic of China
Phthalate esters (PAEs) are synthetic organic compounds and inte
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