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Magnetic mesoporous polyimide composite for efficient extraction of Rhodamine B in food samples
Author(s) -
Hu Kai,
Cheng Jiamin,
Lu Binbin,
Zhao Wenjie,
Dong Chunhong,
Yang Huaixia,
Huang Yanjie,
Zhang Shusheng
Publication year - 2019
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201900054
Subject(s) - materials science , rhodamine b , polyimide , mesoporous material , nanocomposite , composite number , magnetic nanoparticles , scanning electron microscope , chemical engineering , adsorption , analytical chemistry (journal) , composite material , chromatography , nanoparticle , nanotechnology , chemistry , organic chemistry , layer (electronics) , photocatalysis , engineering , catalysis
A core‐shell structured magnetic polyimide composite has been synthesized by the covalent coating of a mesoporous polyimide polymer onto the surface of magnetite nanoparticles. The nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy, N 2 adsorption‐desorption isotherms, X‐ray diffraction, infrared spectroscopy, and vibrating sample magnetometry. The results showed that the prepared composite had a large surface area (306.45 m²/g), a unique pore size (2.15 nm), and strong magnetic properties (45.7 emμ/g), rendering it a promising sorbent material for magnetic solid‐phase extraction. The parameters that affect the extraction efficiency of rhodamine B were optimized with the assistance of response surface methodology. Under the optimal conditions, the developed method has been successfully applied to determine the rhodamine B in food samples. The linearities and limits of detection of rhodamine B in hot pepper, red wine, and chili powder samples were measured. Satisfactory recoveries in the range of 94.8–103.3% with relative standard deviations <5.5% were obtained. Investigation of the adsorption mechanism of magnetic polyimide composite indicated that multiple interactions, including hydrophobic, π‐π, and hydrogen bonding interactions, were involved in the adsorption process.