Core-shell magnetic covalent organic framework nanocomposites as an adsorbent for effervescent reaction-enhanced microextraction of endocrine disruptors in liquid matrices

Enhanced extraction of organophosphorus pesticides from fruit juices using magnetic effervescent tablets composed of the NiFe2O4@SiO2@PANI-IL nanocomposites

“…Recycling of the NiFe 2 O 4 @SiO 2 @PANI-IL nanocomposites MNP reusability (i.e., recycling) is an important metric for improving the application potential of nanocomposites. 33 We analyzed reusability of the NiFe 2 O 4 @SiO 2 @PANI-IL adsorbent by regenerating with three washing cycles of ethanol and water, and subsequent drying for use in another effervescent-tablet preparation and extraction cycle. As a result, the three-layer core-shell nanomaterial could be reused for at least eight cycles with ER losses of <10%, suggesting that the nanocomposites retains excellent recyclability and stability (Fig.…”

Covalent Organic Framework Composites: Synthesis and Analytical Applications

“…Novel dispersive-solvent-free microextraction technique known as effervescence reaction-enhanced microextraction (ERME) was reported using magnetic TAPB-TPA COF composite for the extraction of six endocrine disruptors from environmental and biological samples [ 24 ]. The ERME is based on the dispersion of the adsorbent using CO 2 bubbles generated from an acid/base reaction.…”

“… Schematic diagram of the ERME method: ( a ) synthesis of TAPB-TPA-coated NiFe 2 O 4 composite, ( b ) preparation of the magnetic effervescent tablets, ( c ) pre-concentration and analytical analysis of endocrine disruptors. (Adapted with permission from reference [ 24 ], copyright 2020, Elsevier). …”

“…Magnetic nanoparticles (NPs) are attractive for a wide range of applications due to their remarkable magnetic properties, stability, biocompatibility, and fast separation using an external magnetic field [23]. The majority of magnetic COF composites contain iron oxide, Fe 3 O 4 , as the magnetic NP, although a few other examples with NiFe 2 O 4 [24] and CuFe 2 O 4 [25] NPs have been reported. Superparamagnetic iron oxide NPs are Fe 3 O 4 particles with cores below 100 nm in diameter [26].…”

Effervescence-Assisted Microextraction—One Decade of Developments

“…The dispersion of the sorbent by effervescent reaction was complete in less than 3 min, and once recovered, the sorbent can be washed and reused on a new extraction cycle. The same analytes and other endocrine disruptors were determined by Tan et al in water samples using effervescent tablets containing core-shell magnetic organic frameworks (NiFe 2 O 4 @COF) as sorbents [ 31 ].…”