Preparation of molecularly imprinted nanoparticles with superparamagnetic susceptibility through atom transfer radical emulsion polymerization for the selective recognition of tetracycline from aqueous medium

• Published in: Journal of hazardous materials 2012-02, Vol.205-206, p.179-188
• Main Authors: Dai, Jiangdong, Pan, Jianming, Xu, Longcheng, Li, Xiuxiu, Zhou, Zhiping, Zhang, Rongxian, Yan, Yongsheng
• Format: Article
• Language: English
• Subjects: Adsorption; Animals; Anti-Bacterial Agents - chemistry; Aqueous medium; Atom transfer radical emulsion polymerization; Ferrosoferric Oxide - chemistry; Food Contamination - analysis; Magnetic molecularly imprinted nanoparticles; Magnetics; Meat - analysis; Methacrylates - chemistry; Microscopy, Electron, Scanning; Microscopy, Electron, Transmission; Nanoparticles - chemistry; Nanoparticles - ultrastructure; Polymerization; Selective recognition; Silanes - chemistry; Spectroscopy, Fourier Transform Infrared; Swine; Tetracycline; Tetracycline - chemistry; Thermogravimetry; Water Pollutants, Chemical - chemistry; Water Purification - methods
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2011.12.056

► Atom transfer radical emulsion polymerization is a “living” and green technique. ► Nanoparticles can overcome mass transfer limitations and improve accessibility. ► Molecular imprinted nanoparticles with magnetic property for fast separation. ► The performance of imprinted nanoparticles was investigated in detail. ► Nanoparticles were used to selective recognize Tetracycline from water medium. In the work, we reported an effective method for the preparation of molecularly imprinted nanoparticles with superparamagnetic susceptibility through atom transfer radical emulsion polymerization (ATREP), and then as-prepared magnetic molecularly imprinted nanoparticles (MMINs) were evaluated as adsorbents for selective recognition of tetracycline (TC) molecules from aqueous medium. The resulting nanoparticles were characterized by FT-IR, TGA, VSM, SEM and TEM. The results demonstrated MMINs with a narrow diameter distribution were cross-linked with modified Fe3O4 particles, composed of imprinted layer and exhibited good magnetic sensitivity, magnetic and thermal stability. Batch rebinding studies were carried out to determine the specific adsorption equilibrium, kinetics, and selective recognition. The estimated adsorption capacity of MMINs towards TC by the Langmuir isotherm model was 12.10mgg−1 at 298K, which was 6.33 times higher than that of magnetic non-molecularly imprinted nanoparticles (MNINs). The kinetic property of MMINs was well-described by the pseudo-second-order rate equation. The results of selective recognition experiments demonstrated outstanding affinity and selectivity towards TC over competitive antibiotics. The reusability of MMINs showed no obviously deterioration at least five repeated cycles in performance. In addition, the MMINs prepared were successfully applied to the extraction of TC from the spiked pork sample.