Novel dual-template magnetic ion imprinted polymer for separation and analysis of Cd2+ and Pb2+ in soil and food

• Published in: Journal of cleaner production 2020-07, Vol.262, p.121387, Article 121387
• Main Authors: Xie, Chunsheng, Huang, Xiangjin, Wei, Shoulian, Xiao, Chun, Cao, Jiangfei, Wang, Zhenxing
• Format: Article
• Language: English
• Subjects: Adsorption; Cd2+ and Pb2; Dual-template magnetic ion imprinted polymer; Magnetic solid phase extraction; Papain
• ISSN: 0959-6526; 1879-1786
• DOI: 10.1016/j.jclepro.2020.121387

An environmentally friendly dual-template magnetic ion imprinted polymer (DMIIP) of Cd2+ and Pb2+ were prepared by surface imprinting technique combined with a sol-gel process using Cd2+ and Pb2+ as dual-templates, papain as a functional monomer and magnetic mesoporous Fe3O4@mSiO2 as substrate. The Polymer was characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and adsorption experiments. Maximum adsorption capacities of DMIIP were 41.69 for Cd2+ and 76.39 mg/g for Pb2+ in a mixed solution. We also studied factors affecting adsorption and desorption of Cd2+ and Pb2+. DMIIP clearly demonstrates a stronger ability than dual-template magnetic none-ion imprinted polymer (DMNIP) to selectively adsorb Cd2+ and Pb2+ from solutions containing other metal ions. Absorption by DMIIP was well fitted with a pseudo-second-order kinetic model. After eight adsorption-desorption cycles, adsorption capacity of DMIIP relative to Cd2+ and Pb2+ decreased 6.1% and 6.3%, respectively. The developed MISPE-GFAA method using DMIIP as adsorbent was satisfied to Cd2+ and Pb2+ determination in soil and food samples. The polymer could be a green and promising adsorbent to remove Cd2+ and Pb2+ from soil and food samples. [Display omitted] •The DMIIP was prepared by using papain as functional monomer.•The synthesis used surface imprinting technique combined with sol-gel process.•Good adsorption capacity and selectivity was obtained toward Cd2+ and Pb2+ ions.•The DMIIP presents as a reliable and green absorbent for soil and food analysis.