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In the last few decades, there has been enormous growth in ferrite nanoparticles. Magnetic, optical, and electrical properties of ferrites gain consideration due to their use in various applications such as rechargeable lithium batteries, medical diagnostics, solar energy devices, and so forth. A vast increase in interest in ferrite nanoparticles has led them to be used as catalysts in various applications as they possess a large surface area‐to‐volume ratio. Furthermore, iron‐based magnetic characteristics make it simple to retrieve catalysts by using an external magnet. Iron's catalytic potential, however, is far less than copper's. Therefore, the catalytic scope is substantially increased by substituting copper within the crystal lattice. Recently copper ferrite nanoparticles have caught the interest of numerous researchers due to low‐cost magnetic material, stability under diverse conditions, and ease at which catalyst can be retrieved using an external magnetic field and utilized repeatedly. This review of data from year 2010 through 2022 emphasizes the synthesis method, structure, application in dyes degradation, catalytic potential in the number of coupling reactions, recyclability, and reusability of the magnetic catalyst.

The development of new strategies for the production of nitrogen and sulfur-containing heterocycles remains an extremely alluring but challenging proposition. Current progress in the various synthetic methods and biological activities are discussed.

In recent years, magnetic nanoparticles and nanocomposites play an important role as a nanocatalyst in the creation of a wide range of bioactive heterocycles with extraordinarily high activity and selectivity, low energy consumption, and extended life. Among all heterocycles, many natural products, pharmaceuticals, and bioactive compounds contain pyran scaffolds which have a wide range of uses in biomedical research, industry, and medicine. Additionally, these are also widely used in the synthesis of novel heterocyclic systems as precursors. This study focused on recent advances in the last 5 years in using various magnetic recoverable and recycled nanoparticles and nanocomposites to synthesize pyran derivatives and their pharmacological activity. This article has been classified into three subsections: (i) MNPs‐metal nanocomposite catalyzed reactions, (ii) MNPs‐organic based nanocomposite catalyzed reactions, and (iii) MNPs‐ionic liquid nanocomposite catalyzed reactions and (iv) MNPs‐acid based nanocomposite to describe catalytic efficiency of magnetic nanocomposites for the synthesis of pyran derivatives. A comparative study of nanocomposites and different approaches for green synthesis of pyrans by highlighting the advantages and disadvantages along with catalyst recovery and recyclability has been mentioned, which will help scientists to probe and stimulate the study of these scaffolds.

Facile approach has been employed for the synthesis of new copper ferrite impregnated sulfonated graphene oxide (SGO) nanocomposite via co‐precipitation technique. The newly created nanocomposite has exceptional qualities like a strong stability, large surface area, simple as well as effective recoverability. Structure, composition, and morphology of CuFe2O4@SGO nanocomposite were analyzed by fourier‐transform infrared spectroscopy (FT‐IR), scanning electron microscope (SEM), energy dispersive X‐Ray (EDX), X‐ray diffraction (XRD), and thermogravimetric analysis (TGA) techniques. The results presented the decoration of CuFe2O4 nanoparticles decorated uniformly upon the SGO sheets. Presently, photocatalytic efficiency of synthesized nanocomposite has been assessed for the deterioration of methyl violet 2B (MV) dye. On the effectiveness of dye degradation, the impacts of variables including initial dye concentration, catalyst loading, and visible light exposure have been studied. The photocatalytic data show that 97% of dye was degraded in merely 90 min. CuFe2O4@SGO nanocomposite was easily recyclable and hence it shows future scope as an inexpensive and alternate approach for removal of dye. The results of antimicrobial data evaluated that outstanding antibacterial data counter to Escherichia coli, Bacillus subtilis, and excellent antifungal data counter to Candida albicans was perceived.

In this investigation, a unique Fe3O4‐supported‐sulfonated graphene oxide/polyaniline (FSGO/PANI) nano‐composite was designed and further, it was evaluated for antimicrobial activity. In situ polymerization in an aqueous acidic medium using ultrasonic irradiation technique was used to create this innovative nano‐composite (FSGO/PANI). FTIR, XRD, SEM, EDX, and NMR, approaches were used to characterize the surface morphologies as well as structures of the developed FSGO/PANI nano‐composite. Both FTIR and NMR spectroscopy supported the existence of polyaniline (PANI). XRD data depicted that the produced nano‐composite was an amorphous material. TGA data were used to confirm the thermal stability of FSGO/PANI. At 100°C, the nano‐composite lost weight relatively slowly (11%) and roughly (34.35%) at 400°C. The FSGO/PANI nano‐composite showed excellent results in form of MIC (minimum inhibitory concentration) and ZOI (zone of inhibition) against bacterial strains and fungal strains in tests for antimicrobial activity.

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