title: Preparation of a core-shell magnetic ion-imprinted polymer via a sol-gel process for selective extraction of Cu(II) from herbal medicines.
abstract: A novel magnetic surface ion-imprinted polymer (c-MMWCNTs-SiO2-IIP) was synthesized for the first time using magnetic CNTs/Fe3O4 composites (c-MMWCNTs) as the core, 3-ammonium propyltriethoxysilane (APTES) as the functional monomer, tetraethylorthosilicate (TEOS) as the cross-linker and Cu(II) as the template. c-MMWCNTs-SiO2-IIP was evaluated for selective extraction of Cu(II) from herbal medicines via a magnetic solid phase extraction (M-SPE) procedure. One factor affecting the separation and preconcentration of the target heavy metal was pH. Under the optimized experimental conditions, the adsorption kinetics and adsorption capacity of c-MMWCNTs-SiO2-IIP toward Cu(II) were estimated. The results indicated that the adsorption mechanism corresponds to a pseudo-second order adsorption process, with a correlation coefficient (R(2)) of 0.985 and a maximum adsorption capacity of 42.2 mg g(-1). The relative selectivity factor (β) values of Cu(II)/Zn(II) and Cu(II)/Pb(II) were 38.5 and 34.5, respectively. c-MMWCNTs-SiO2-IIP, combined with flame atomic absorption spectrometry, was successfully applied in the extraction and detection of Cu(II) in herbal medicine, with high recoveries ranging from 95.6% to 108.4%.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Huan
authors.initials: H
authors.lastname: He
authors.forename: Deli
authors.initials: D
authors.lastname: Xiao
authors.forename: Jia
authors.initials: J
authors.lastname: He
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: He
authors.forename: Hao
authors.initials: H
authors.lastname: Dai
authors.forename: Jun
authors.initials: J
authors.lastname: Peng
mesh_terms: D003300:Copper / Q000302:isolation & purification*; D005782:Gels; D029001:Herbal Medicine; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005782:Gels; D011108:Polymers; D003300:Copper