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Cobalt ferrite, Copper ferrite and cobalt doped copper ferrite nanoparticles have been synthesized and characterized using different characterization methods (XRD, FTIR and FESEM). The prepared nanoparticles have been used as promising fillers of the polyvinylidene fluoride (PVDF) polymer. The PVDF/(Cu–CoFe 2 O 4 , CoFe 2 O 4 , and CuFe 2 O 4 ) nanocomposites films have been prepared via a simple solution casting technique. The optical properties and the piezoelectric response of the prepared nanocomposite films have been studied. This study showed that Cu–CoFe 2 O 4 and CoFe 2 O 4 , have enhanced the interfacial polarization density and dielectric constant. The prepared nanofillers reduced the PVDF band gap energy value. The optical conductivity value of PVDF/(Cu–CoFe 2 O 4 and CoFe 2 O 4 ) increased five times compared with the pure PVDF. Also, an increase in the piezoelectric response has been recorded by adding the nano-fillers to the pure PVDF.

One major cause of to environmental pollution is industrial dye wastewater. The main purpose of current work was synthesis and investigation of effectiveness of LDH–Ferrite–Biochar–Polymeric composites for removal of anionic dye (Acid blue 41) from wastewater. The co-precipitation technique is used to synthesize Zn–Al Layered double hydroxide-Manganese ferrite–Egg Shell biochar–Starch (Zn–Al–MnFe 2 O 4 –ESB–Sta), Cu–Al Layered double hydroxide–Cadmium ferrite–Eucalyptus bark biochar–Chitosan (Cu–Al–CdFe 2 O 4 –EBB–Cs), Cd–Al Layered double hydroxide–Cobalt ferrite–Jujube wood biochar–Sodium alginate (Cd–Al–CoFe 2 O 4 –JWB–Na–Alg), Mn–Al Layered double hydroxide–Copper ferrite–Mulberry Stem Biochar–Starch (Mn–Al–CuFe 2 O 4 –MSB–Sta) and Co–Al Layered double hydroxide–zinc ferrite-peanut shell biochar–carboxymethyl cellulose (Co–Al–ZnFe 2 O 4 –PSB–CMC). According to findings of recent studies, Zn–Al–MnFe 2 O 4 –ESB-Sta (40.1 mg/g), Cu–Al–CdFe 2 O 4 –EBB–Cs (35.6 mg/g), Cd–Al–CoFe 2 O 4 –JWB–Na–Alg (28.1 mg/g), Mn–Al–CuFe 2 O 4 –MSB-Sta (37.3 mg/g) and Co–Al–ZnFe 2 O 4 –PSB–CMC (31.2 mg/g) has adsorption capacity for acid blue 41 dye. All composites achieved maximum adsorption effectiveness in acidic range (2–5), eliminating AB-41 dye in 45 min at optimal dose 0.05 g and 150 mg/l initial dye concentration was optimum. After 30 °C, adsorption potential decreased, indicating exothermic mechanisms. The efficiency was still adequate after five cycles of regeneration. The Pseudo 2nd order Kinetics and Freundlich isotherm model were successfully implemented among the applied models. The aforementioned composites are deemed the most cost-effective, energy-efficient, ecologically friendly, and biologically renewable materials for treating wastewater containing AB-41 dye. The results indicate that Zn–Al–MnFe 2 O 4 –ESB–Sta is the most effective synthetic composite for water remediation among all others. Furthermore, it was discovered in a column study that the ideal bed height, flow rate, and inlet concentration of dye were 3 cm, 3.6 ml/min, and 50 mg/l, respectively, for achieving the highest adsorption of AB-41 dye. Graphical Abstract

Nanomaterials, especially ferrites, have various applications in mechanical, electrical, and optical fields. However, their abilities in environmental applications remain unexplored. In this work, the flash auto-combustion method has been used to prepare three different compositions of CuFe 2 O 4 , Zn-CuFe 2 O 4 , and Co-CuFe 2 O 4 nanocomposite. The structure, spectroscopic, surface, and morphological properties of the prepared samples were characterized using XRD, FTIR, BET, and HRTEM, respectively. According to XRD analysis, the prepared ferrites consist of nanocrystalline particles with sizes of 24.5, 37.5, and 32.6 for CuFe 2 O 4 , Zn-CuFe2O4, and Co-CuFe2O4, respectively. Zn-CuFe 2 O 4 and Co-CuFe 2 O 4 had a  single cubic phase, while a tetragonal phase was formed in CuFe 2 O 4 . The addition of cobalt and zinc to copper ferrite increased the crystallite size and the lattice parameters. The absorption band in FTIR spectra, which represents the stretching vibrations along the [MetalO] bond at the octahedral (B) position, was nearly constant (412 Cm −1 ) by the addition of Zn to CuFe2O4. The surface area and quantity of gas adsorbed on the surface of Co-CuFe2O4 were the highest. The greatest force constants [(Ko = 1.37 & KT = 1.32 105 dyne/cm] were detected in Zn-CuFe 2 O 4 . Co-CuFe2O 4 exhibited the highest saturation magnetization as well as magnetocrystalline anisotropy. From FESM, the particles have a homogeneous distribution, which is confirmed by the appropriate synthesis method. The nanonanosamples had an average particle size of 79 nm, 66 nm, and 56 nm for CuFe 2 O 4 , Co-CuFe 2 O 4 , and Zn-CuFe 2 O 4 , respectively. The surface area and quantity of gas adsorbed on the sample surface were increased by doping Cu ferrite with Co and Zn. All the prepared samples were tested for heavy metal (Cr 6+ ) removal from the water; they demonstrated promising results after optimizing the experimental conditions at pH 7 and contact time 50 min, and these values reached 54%, 90%, and 93% for CuFe 2 O 4 , Zn-CuFe 2 O 4 , and Co-CuFe 2 O 4 nanocomposite, respectively.

Nanoparticles of zinc ferrite (ZnFe 2 O 4 ) and copper ferrite (CuFe 2 O 4 ) were synthesized, and characterized, and these materials were applied for removal of organic dyes of alizarin yellow R (AYR), thiazole yellow G (TYG), Congo red (CR), and methyl orange (MO) from industrial wastewater through adsorption technique. Synthesis of ZnFe 2 O 4 and CuFe 2 O 4 was achieved through chemical co-precipitation method. These nanomaterials were characterized for physicochemical properties using XRD, FTIR, BET, VSM, DLS, Zeta-potential, and FESEM-EDX analytical instruments. BET surface areas of ZnFe 2 O 4 and CuFe 2 O 4 were 85.88 m 2 /g and 41.81 m 2 /g, respectively. Adsorption-influencing parameters including effect of solution pH, adsorbent quantity, initial concentration of dye pollutant, and contact time were examined. Acidic medium of the solution favored higher percentage of removal of dyes in wastewater. Out of different isotherms, Langmuir equilibrium isotherm showed the best fit with experimental data, indicating monolayer adsorption in the treatment process. The maximum monolayer adsorption capacities were found as 54.58, 37.01, 29.81, and 26.83 mg/g with ZnFe 2 O 4 , and 46.38, 30.06, 21.94, and 20.83 mg/g with CuFe 2 O 4 for AYR, TYG, CR, and MO dyes, respectively. From kinetics analysis of the results, it was inferred that pseudo-second-order kinetics were fitting well with better values of coefficient of determination ( R 2 ). The removal of four organic dyes from wastewater through adsorption technique using nanoparticles of ZnFe 2 O 4 and CuFe 2 O 4 was observed to be spontaneous and exothermic. From this experimental investigation, it has been inferred that magnetically separable ZnFe 2 O 4 and CuFe 2 O 4 could be a viable option in removal of organic dyes from industrial wastewater.

Magnetic copper ferrite nanoparticles, CuFe2O4-NPs (CFN) were synthesized via a facile sol–gel method for the effective removal of 4-nitrophenol (4-NP) and indigo carmine dye (IC) as typical hazardous organic pollutants from wastewater. The texture, morphology, and composition of the synthesized CuFe2O4 NPs were thoroughly explored by various physicochemical techniques. Various factors affecting the dye adsorption including the effect of adsorbent mass, contact time, pH, initial IC concentration, and temperatures were investigated to determine the optimum conditions for IC dye removal. The impact of diverse species and other coexisting dyes on the adsorption capacity of CFN was investigated. Five adsorption isotherms were investigated using two-parameters (Tekman, Langmuir, and Freundlich) and three-parameters (Sips, and Redlich-Peterson) models. CFN exhibited a maximum adsorption capacity of 57.4 mg/g according to the Sips model, with optimal conditions observed at pH 3, a contact time of 90 min, and an adsorbent mass of 0.1 g. Thermodynamic data revealed both the endothermic nature of dye removal and the random arrangement of dye molecules onto CFN adsorbent. The IC dye elimination mechanism was elucidated. Furthermore, the CFN-catalyzed reduction of 4-nitrophenol by NaBH4 followed first-order kinetics at a high rate of 0.4365 min−1, reflecting the high catalytic capacity of the synthesized CFN. The magnetic features, cost-effectiveness, recyclability, and high adsorption and catalytic activities towards IC dye and 4-NP removals made the synthesized CFN a promising catalyst for wastewater remediation.

Advanced oxidation processes (AOPs) demonstrate great micropollutant degradation efficiency. In this study, CuFe2O4 was successfully used to activate peracetic acid (PAA) to remove Rhodamine B. Acetyl(per)oxyl radicals were the dominant species in this novel system. The addition of 2,4-hexadiene (2,4-HD) and Methanol (MeOH) significantly inhibited the degradation efficiency of Rhodamine B. The ≡Cu2+/≡Cu+ redox cycle dominated PAA activation, thereby producing organic radicals (R-O˙) including CH3C(O)O˙ and CH3C(O)OO˙, which accounted for the degradation of Rhodamine B. Increasing either the concentration of CuFe2O4 (0–100 mg/L) or PAA (10–100 mg/L) promoted the removal efficiency of this potent system. In addition, weakly acid to weakly alkali pH conditions (6–8) were suitable for pollutant removal. The addition of Humid acid (HA), HCO3−, and a small amount of Cl− (10–100 mmol·L−1) slightly inhibited the degradation of Rhodamine B. However, degradation was accelerated by the inclusion of high concentrations (200 mmol·L−1) of Cl−. After four iterations of catalyst recycling, the degradation efficiency remained stable and no additional functional group characteristic peaks were observed. Taking into consideration the reaction conditions, interfering substances, system stability, and pollutant-removal efficiency, the CuFe2O4/PAA system demonstrated great potential for the degradation of Rhodamine B.

Environmental and public health risks may arise from the presence of antibiotic residues, and specifically chloramphenicol in food samples. Therefore, it is quite important for researchers to detect chloramphenicol. In this work, PDA@CuFe 2 O 4 nanoparticles were synthesized and characterizsed. The PDA@CuFe 2 O 4 nanoparticles that had been prepared were used to create PDA@CuFe 2 O 4 /GCE, which was then used to detect chloramphenicol electrochemically in a 0.1 M phosphate buffer solution (pH 7). The study focused on the electrochemical properties, including changes in scan rate, sensing, and pH influence. Compared to the unmodified electrode, the PDA@CuFe 2 O 4 /GCE electrode exhibits better sensing properties. The advantage of the PDA@CuFe 2 O 4 /GCE electrode is that it shows unique electrochemical sensing toward individual and chloramphenicol detection; for instance, it has a low detection of 0.12µM for chloramphenicol detection and a high sensitivity of 16.25A µM −1  cm −2 for chloramphenicol detection. Graphical abstract

The current study proposes a low-cost, environmentally benign manufacturing approach of copper ferrite nanoparticles (CuFe2O4 NPs) via mushroom extract of Pleurotus florida (PFE) as the first-time report. Several characterization methods verified the production of PFE-CuFe2O4 NPs. The absorption spectrum exhibited the peak at 420 nm; band gap of 1.85 eV. The studies of SEM and TEM confirmed spherical and homogeneously distributed CuFe2O4 NPs with an average size of 22.4 ± 1.4 nm. The FTIR reported the presence of bio-essential molecules in PFE can act as a stabilizing and capping agent. The NPs were found to be fairly stable with zeta potential found at 28.9 ± 0.2 mV. Numerous in vitro biological investigations exemplified the applicability and practicality of CuFe2O4 NPs and compare them with the standard. The biofunctionalized CuFe2O4 NPs demonstrated a potent antibacterial activity against E. coli and S. aureus. Additionally, it was discovered that CuFe2O4 NPs have superior antioxidant activity (77–83%) and their scavenging ability is more comparable to ascorbic acid (control). Furthermore, a degradation efficiency of 91–92% was observed in 10–15 min for CuFe2O4 NPs in rhodamine B (RhB) and methylene blue (MB) dyes, indicating their remarkable effectiveness in this regard. Future research may focus on applying CuFe2O4 NPs to comprehensive wastewater treatment and determining the degradation products and ecological consequences.

In this work, crystalline copper-zinc ferrite nanoparticles were synthesized by a simple co-precipitation method. Morphological characterization of produced samples was done using a scanning electron microscope (SEM). A transmission electron microscope (TEM) was utilised for further identification and confirmation of the particle morphology and size. Moreover, Fourier transformation infrared (FTIR) spectroscopy and X-ray diffraction (XRD) was employed to examine crystalline structure, chemical structure, and surface area respectively. Optical properties were examined by UV–Vis spectroscopy. The results indicate that the Zn 0.5 Cu 0.5 Fe 2 O 4 nanoparticles’ crystallite size was 28.5 nm. The experiments focused on the impact of various factors, such as pH levels, initial MB concentration, and nanocatalyst dosage, on the observed photocatalytic efficiency. The photocatalytic performance of Zn 0.5 Cu 0.5 Fe 2 O 4 nanoparticles under UV light was evaluated by decolorization of Methylene Blue (MB) azo dye. Photocatalysis degradation of 10 ppm of MB adding 15 mg of Zn 0.5 Cu 0.5 Fe 2 O 4 nanoparticles was 94% after 135 min at room temperature and pH value of 9. Further interpretation was carried out and a proposed mechanism for the MB photodegradation by Zn 0.5 Cu 0.5 Fe 2 O 4 nanoparticles was suggested.

Copper ferrite-copper oxide (CuO-CuFe O ) nanoparticles as a semiconductor composite with p-n junction were synthesized by co-precipitation reaction. Then, a novel CuO-CuFe O carbon paste modified electrode was fabricated which displays an effectual electrocatalytic response to the oxidation of acetaminophen (AC) and codeine (CO). A linear range of 0.01-1.5 μmol L and 0.06-10.0 μmol L with the detection limits of 0.007 μmol L and 0.01 μmol L were achieved for AC and CO, respectively. The practical usage of the proposed sensor revealed reasonable results for quantification of AC and CO in biological fluids.