Magnetic solid-phase extraction of bisphenol A from water samples using nanostructured material based on graphene with few layers and cobalt ferrite

Simple single reactor synthesis of nickel (II)-cobalt (II) ferrite composites with biochar and their photocatalytic properties

“…IR spectra show the presence of vibrations of various groups of atoms of the organic and inorganic parts of the composite material. For the organic part, the oscillation patterns are (-OH) 3340-3450 cm −1 [39,40], (C-C) 1616-1710 cm −1 [40,41], (C-O) 1000-1200 cm −1 [39], (C-H) 810 cm −1 [39]. The oxide part of the composite is characterised by fluctuations of groups of atoms (Fe 3+ -O)A 580-590 cm −1 [42], (Co, Ni-O)B 460-470 cm -1 [30].…”

A novel magnetite C18/paracetamol/alginate adsorbent bead for simultaneous extraction of synthetic antioxidants and bisphenol A in water samples

“…In real sample analysis, complex matrices and low concentration levels of analytes are key limitations for determination by chromatography and spectrometry, and sample pretreatment or preconcentration is required. Sample preparation methods developed for the adsorption/extraction of antioxidants and BPA include solid-phase extraction (SPE), 6 dispersive solid-phase extraction (DSPE), 7 solid-phase microextraction, 8 liquid-liquid extraction, 9 and magnetic solidphase extraction (MSPE), [10][11][12] dispersive liquid-liquid microextraction (DLLME), 13 and microextraction using deep eutectic solvents (DESs). 14 Compared to SPE and LLE, MSPE is more suitable for large volumes of sample solution.…”

“…MSPE requires no ltration and no SPE column. 11,12,15 Magnetic adsorbents that have been applied for the MSPE and preconcentration of antioxidants and BPA include composites of multi-walled carbon nanotubes, iron oxide and manganese dioxide (MWCNTs-Fe 3 O 4 -MnO 2 ) 11 and magnetic cobalt ferrite, natural organic matter, and graphene (CoFe 2 O 4 /NOM/ graphene) 12 for BPA. These adsorbents were synthesized either under N 2 gas or at high temperature (100 °C) for 24 h. A dextran coated-magnetite was prepared by co-precipitation and then doped with a metal-organic framework (MOF), using the reux method with dimethylformamide (DMF) as a suspension solvent: the obtained MOF:Fe 3 O 4 @Dex composite was applied for BPA removal.…”

Magnetic covalent organic frameworks for rapid solid-phase extraction of phthalate esters and bisphenol A in beverage samples

“…For MSPE, the contact surface between the adsorbent and analyte is larger, so it has higher extraction efficiency and shorter extraction time, and magnetic materials can achieve simple and rapid phase separation through an external magnetic field. 20…”