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[Display omitted] • CaFe 2 O 4 nanoparticles show superparamagnetic behavior at 300 K. • CaFe 2 O 4 nanoparticles could be useful for biomedical applications. • Magnetic and electronic properties of CaFe 2 O 4 nanoparticles contribute to breakthroughs in electronics and spintronic applications. • CaFe 2 O 4 electrodes improve efficiency useful in batteries and supercapacitors for renewable energy applications. • CaFe 2 O 4 nanoparticles show cutting-edge advancements for catalytic applications. Over the last decade, nanotechnology has emerged as a game-changing field, with transition metal nanoparticles, notably those consisting of CaFe 2 O 4 , standing out as a key component. These nanoparticles have gotten a lot of interest because of their great potential in a variety of biological applications. Scientists all around the world are working hard to create new calcium-based nanoparticles in a variety of forms and sizes to improve their functioning. While there is a substantial corpus of research on CaFe 2 O 4 nanoparticles, there is a significant void in comprehensive reviews that properly elucidate their current advances and future applications in biological sciences. This review study attempts to give in-depth insights into the most recent advances in CaFe 2 O 4 nanoparticle research, with a particular emphasis on electrochemical, environmental, and biological nanotechnology. The research digs into the finer points of the most recent breakthroughs in the synthesis of CaFe 2 O 4 nanoparticles, with a focus on enhancing their imaging capability. Their applications in electrochemical processes, photocatalysis, sensing technologies, and mechanical functionalities receive special attention. The paper highlights the superparamagnetic response of CaFe 2 O 4 nanoparticles to room-temperature oscillating magnetic fields, which opens up new possibilities for investigation. The study not only elucidates the potential benefits of using these nanoparticles but also addresses the limitations connected with their larger application. The magnetic properties of CaFe 2 O 4 nanoparticles are given special attention, particularly in the context of data storage and magnetic sensors. The paper finishes with a complete summary of current developments in several disciplines utilizing CaFe 2 O 4 nanoparticles, highlighting specific applications and exploring their distinctive features. The review emphasizes the importance of future research into ways to improve the magnetic characteristics of CaFe 2 O 4 materials, particularly in the realms of data storage and magnetic sensor technologies. [ABSTRACT FROM AUTHOR]

The relationship between local structure and visible-light activated photocatalytic effect of simulated domestic waste slag glass–ceramics (R-NaWSFe) was investigated. The largest pseudo-first-order rate constant of 9.75 × 10−3 min−1 was estimated for methylene blue decomposition test under the visible-light irradiation using R-NaWSFe with additional 30 mass% of Fe2O3 heat-treated at 900 °C for 100 min. The reason for the high photoactivity of this sample was mainly due to nanoparticles of CaFe2O4 and α-Fe2O3 confirmed by the Mössbauer spectrum measured at 77 K. It is concluded that the nanoparticles of magnetic components in silica are essential for exhibiting visible-light activated catalytic effect. [ABSTRACT FROM AUTHOR]

In this study, visible-light active photocatalyst based on TiO2 was designed using CaFe2O4 nanoparticle as an effective sensitizer. CaFe2O4 nanoparticles (CFO) were synthesized by Pechini method using calcium nitrate and iron nitrate. Then, the high crystalline CFO calcined at 800 oC was combined with TiO2 in a simple sol-gel aging. In order to form coupled structure, CFO suspension and TiO2-precursor solution were mixed in ethanol solution, and then heated at 80 °C while vigorously stirring. After 6 hrs, the coupled particles were filtered and dried, followed by calcination at 400 °C. The prepared composites were tested for photocatalytic oxidation of Salicylic acid, a model organic compound under visible-light (μ ≥ 420 nm) as monitored by UV-Visible Spectrophotometer. The origin of photoactivity of the heterojunction was found mainly due to the superoxide radical and generation of hydroxyl radical was negligible. The average photo-conversion performance was obtained because of unique energy band matching between CFO and TiO2. [ABSTRACT FROM AUTHOR]

Magnetic CaFe2O4 photocatalyst was successfully synthesized via a solution combustion synthesis (SCS) method, using glycine as the fuel. The as-prepared CaFe2O4 nanoparticles had an average size of 100 nm and broad photo-absorption range. Its band gap calculated from the adsorption edge was fixed at 1.82 eV, which suggested that it could be excited by visible-light. The photo-degradation of methylene blue (MB) under visible light, demonstrated that the CaFe2O4 nanocrystals exhibited high photocatalytic activity. The enhanced photocatalytic activity could be attributed to the small particle size of the CaFe2O4 nanocrystals. Moreover, the product could be easily recycled from the solution by applying an external magnetic field. [ABSTRACT FROM AUTHOR]