Magnetic mesoporous polyimide composite for efficient extraction of Rhodamine B in food samples

Abstract

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 m 2 /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.

Cobalt Ferrite/Polyetherimide Composites as Thermally Stable Materials for Electromagnetic Interference Shielding Uses

“…Hence, aromatic polyetherimides (PEI) are of particular interest since they exhibit an excellent trade-off between the processability and thermal, mechanical, and electrical properties [ 43 , 44 ]. PI composites with dielectric and magnetic properties have been obtained by the reinforcement with copper-nickel [ 45 ], Ba 3 Co 2 Fe 24 O 41 [ 46 ], magnetite [ 47 ], carbon nanotubes [ 48 ], strontium ferrite [ 49 ], and other inorganic particles [ 50 ]. In any case, according to our documentation, there have not been any investigations dealing with the PEI/CoFe 2 O 4 composites for EMI shielding applications.…”

Fabrication of highly crystalline covalent organic framework for solid‐phase extraction of three dyes from food and water samples

“…Moreover, by combining adsorption with appropriate analytical methods (e.g., HPLC, UV-vis, and fluorescence analysis), the concentrations of dyes in the samples can be effectively monitored [17,18]. Recently, to meet the demand for the effective adsorption of dyes, many adsorbents such as graphene oxide, layered-double hydroxide nanomaterial, polyaniline-coated magnetite/silica materials, magnetic mesoporous polyimide composite, metalorganic frameworks (MOFs) and covalent organic frameworks (COFs) [19][20][21][22][23][24] have been manufactured. Particularly, ascribed to the advantages including adjustable pore sizes, large specific surface area, high chemical stability, and abundant functional group characteristics, COFs have become the focus of attention [25][26][27][28].…”

Synthesis of Aromatic Polyamide-Silica Composite Particles and the Effect of Incorporating Silane Coupling Agent

“…Functional nano-and micrometer-sized particles have numerous applications, including as carriers in separation and adsorption processes and in drug transport [1][2][3][4]. Some such particles have a composite core-shell morphology made of polymeric and inorganic components [1][2][3].…”

“…Functional nano-and micrometer-sized particles have numerous applications, including as carriers in separation and adsorption processes and in drug transport [1][2][3][4]. Some such particles have a composite core-shell morphology made of polymeric and inorganic components [1][2][3]. These combinations are advantageous because inorganic materials generally exhibit better thermal resistance, mechanical properties, and shape stability than polymers.…”