Microwave Combustion Method Research Articles

A photo-triggered bioactive nanohydrogel loaded with niobium carbide for stem cell osteogenic differentiation

Photo-Cross-Linkable hydrogel has attracted immense interest in the regeneration of bone repair and regeneration strategies due to its superior biocompatibility and tunable mechanical properties. Recently, Nb was reported to strongly promote the bone regeneration process via an accelerated osteoblast-modulated alkaline phosphatase activity mechanism. In particular, Nb2C MXenes have drawn widespread attention due to their excellent biocompatibility and ability to induce bone formation. However, the easy agglomeration of Nb2C nanosheets and subsequent low cell endocytosis efficacy greatly suppressed the osteogenesis effect. In this study, a subtractive nanopore-engineered Nb2C MXene was prepared through a microwave combustion method, gelatin methacrylate was used as the carrier hydrogel, and the photo-triggered Porous-Nb2C@GelMA hydrogel was fabricated by a photo-triggered process. The pore-forming strategy not only successfully improved the distribution of Nb2C and formed more homogenous Porous-Nb2C@GelMA hydrogels but also guided bone marrow mesenchymal stem cells (BMSCs) toward osteoblast differentiation. Porous Nb2C provided convenient cellular grasping and endocytosis for BMSCs, which further created a favorable environment for differentiation and osteogenesis. This, in turn, leads to an increase in the expression of osteogenic markers, such as ALP and ARS, as well as osteogenic factors, such as BMP-2, COL-1, OCN, and OPN. Consequently, enhancing the regenerative microenvironment by incorporating porous Nb2C composite hydrogels shows promise for application in bone regeneration.

Single Step Synthesis of Cu2ZnSnS4 by Microwave Combustion Method

We report a novel single step process to synthesize Cu2ZnSnS4 nanopowder. Our novel approach is based on combustion method assisted with microwave irradiation. The obtained results showed that the precursors can be quickly decomposed in the microwave field to form Cu2ZnSnS4 nanopowder. The effects of fuel and microwave power on structures and properties of the nanopowder were investigated thoroughly by Raman spectroscopy. This synthesis process is promising for large scale fabrication of light absorbing materials for photovoltaic devices because it is facile, low cost, non-vacuum, single step and time saving.

CaAl1.5Fe0.5O4/6%Ni-ZnO nanocomposites: Synthesis, characterization and effective photocatalyst for the photocatalytic degradation of methylene blue dye

This study focuses on synthesizing and analyzing properties of calcium aluminate photocatalytic nanoparticles using the microwave (MW) combustion method by following the rules of green chemistry and investigates their effectiveness in the adsorption of methylene blue (MB) dye which is a crucial contaminant that enters water resources. The synthesized nanoparticles, including CaAl2O4 (CAO), CaAl1.5Fe0.5O4 (CAFO), 6 %Ni-ZnO (NZO), and CaAl1.5Fe0.5O4/6%Ni-ZnO (CAFONZO) composites, were characterized using various techniques. XRD analysis confirmed the formation of spinel structures in all samples. The crystallite size and lattice constants were determined, showing a reduction in Crystallite size of CAO from 45.98 nm to 37.55 nm after Fe3 + doping. Then, with the formation of CAFONZO Crystallite size 13.99 nm was obtained. FT-IR analysis revealed the chemical interactions between atoms in the spinel structures Nitrogen adsorption/desorption isotherms were used to determine the specific surface area of nanoparticles, pore volume, and pore size. Specific surface area of CAO, CAFO, and CAFONZO are 1.637, 1.745, and 9.903 (m2/g), respectively. SEM and TEM images provided insight into the morphology and size of the nanoparticles. According to TEM images, after Fe3 + doping, the size of particles decreased from 85 to 32 nm. UV-DRS was performed to determine the optical band gap energy of the photocatalysts. The calculated band gap values of pure CAO, CAFO, and NZO nanoparticles were 3.2 eV, 2.5 eV, and 2.7 eV, respectively. Mott-Schottky analysis indicated the type of semiconductors and the energy levels of the conduction and valence bands. Valence band (VB) values of CAFO and NZO are 2.86 eV and 2.03 eV, respectively. The photocatalytic activity of the nanoparticles was evaluated by degrading MB under visible light illumination. The adsorption studies were conducted by varying the dosage, pollutant concentration, and pH. The results showed that CAFONZO nanoparticles exhibited the highest photocatalytic efficiency, achieving 96 % degradation of MB within 120 min. The combined photocatalyst demonstrated improved efficiency compared to the individual components.

Unveiling the role of rare earth dopant in metal molybdate nanocomposites via facile microwave-combustion strategy and their effect on antibacterial activity

Abstract Developing a robust material holding antimicrobial assets has been an efficient strategy for reducing the risk of infections related to healthcare, significantly with medical devices and touch surfaces. Molybdenum-based compounds have drawn momentous attraction because of their unique characteristics. A series of undoped and 5 % rare earth (Ce & La) doped metal (Ni, Co & Bi) molybdate nanocomposites have been prepared by facile microwave combustion method and characterized. The present study investigates the effect of dopants on crystal structure and morphology, and their impact on anti-bacterial properties is noticed. The UV–Vis. absorption spectra of all samples show a broad absorption band between 280 and 430 nm. The antibacterial properties of the prepared nanocomposites have been examined by the agar diffusion method against three Gram-positive and two Gram-negative bacteria, showing good bactericidal efficiency for all samples, except 5 % Ce–NiMoO4 (antibacterial activity exclusively against Gram-positive bacteria) and 5 % La–NiMoO4 (no antibacterial activity) nanocomposites. This work provided a novel pathway in the biomaterial field.

Low-temperature cluster spin glass transition in the single-domain NiCr2O4 nanoparticles

NiCr2O4 nanoparticles with average particle size ∼15 nm, a single-domain size maintains the bulk canted antiferromagnetic ground state, were synthesized by a microwave combustion method. The magnetic behavior was carefully investigated by static and dynamic magnetic susceptibility measurements. In addition to a spin-glass-like behavior below paramagnetic-ferrimagnetic transition at T C, the NiCr2O4 nanoparticles demonstrate a low-temperature cluster spin glass transition below the spin canting transition T S, which manifests itself as a magnetic anomaly peak around ∼12 K (at 100 Oe) in the zero-field cooled magnetization with a relatively stronger field dependence in a ‘de Almeida-Thouless’ line for spin glasses. The AC susceptibility analyses in different approaches demonstrate a larger relative peak temperature variation per frequency decade and a longer characteristic relaxation time in the order of 0.04 and 10−7 s, against 0.01 and 10−9 s for the high-temperature blocking, indicating the slow spin dynamics for the low-temperature cluster glassy phase. A field-temperature magnetic phase diagram is proposed for the single-domain NiCr2O4 nanoparticles.

Investigations on structural, dielectric, and third-order nonlinear optical studies of Ni0.5Zn0.5Fe2O4 nanoparticles by microwave combustion method with different fuels (glycine, urea and citric acid)

In this article, Ni0.5Zn0.5Fe2O4 nanoparticles (NPs) were synthesized via microwave-assisted combustion method. XRD investigation indicates the cubic spinel structure. At ambient temperature, the dielectric constant and loss were determined by modulating the applied frequency (50 Hz to 200 kHz). The calculated third-order NLO susceptibility (χ(3)) was found for glycine (2.385 × 10-6esu), urea (0.9696 × 10-6esu) and citric acid (2.755 × 10-6esu). However, this work reveals that synthesized NPs have high convenience for optoelectronic, optical switching, and limiting applications.

Cost-effective synthesis of efficient La doped CoMoO4 nanocomposite electrode for sustainable high-energy symmetric supercapacitors

The development of eco-friendly metal-based supercapacitors has attracted increasing attention in recent years for application in high-energy supercapacitors. However, the pertinent research development has been seriously constrained by the limited candidate with low cost and excellent properties. In this work, abundant rare earth La is doped with cobalt molybdate via a time-saving microwave combustion method. Powder X-ray diffraction and Raman spectroscopy analyses confirms the formation of α-CoMoO4 for 5 % La-CoMoO4. The nanocube morphology and elemental stoichiometry of the nanocomposites have been examined by scanning electron microscopy equipped with Energy-dispersive X-ray spectroscopy and high-resolution transmission electron microscopy. The electrochemical behavior is assessed in a three-electrode system and the La-doped CoMoO4 electrodes exhibit highly stepped-up electrochemical performance. The 5 % La-CoMoO4 electrode exhibits a high specific capacitance of 1232.9 F g−1 while the pristine CoMoO4 exhibits 123.2 F g−1 at 1 mA current is applied. Furthermore, XRD, FTIR and XPS analyses are performed after electrochemical studies for 5 % La-CoMoO4 sample. In addition, a symmetric supercapacitor has been fabricated using 5 % La doped CoMoO4, shows energy and power densities of 147.3 Wh kg−1 and 736.67 W kg−1 respectively at 1.7 mA cm−2 current density.

Rare earth doped bismuth molybdate nanoplatelets for boosting electrochemical performance: Facile synthesis and device fabrication

The poor rate performance with minimal specific capacitance (Csp) of bismuth molybdate restricts its viable application in high-end supercapacitors (SCs). Herein, bismuth molybdate nanocomposites have been investigated in both pristine and hybrid forms by microwave combustion method to tackle the problem. The prepared pristine and rare earth-doped bismuth molybdate nanocomposites have been investigated by different analytical techniques. In a three-electrode cell configuration, 5% Ce-doped bismuth molybdate nanocomposite electrode showed a Csp of 889.86 F g−1 at 1 mA cm−2 and superior rate performance. Furthermore in a two-electrode cell configuration, a symmetric SC device has been fabricated using pristine and rare earth (Ce and La)-doped bismuth molybdate nanocomposites. The 5% Ce-doped bismuth molybdate symmetric device output a higher Csp of 1092.18 F g−1 at 5 mV s−1 with an energy density of 24.71 Wh kg−1, surpassing the pristine and La-doped bismuth molybdate symmetric devices. These results propose that the doping strategy has the potential to improve the energy-storing capability of bismuth molybdates.

Spectroscopic Characterization and Luminescence Study of Zinc Aluminate Nanocrystals Prepared by Microwave Combustion Method using Natural Black Pepper as Combustion Agent

Spectroscopic Characterization and Luminescence Study of Zinc Aluminate Nanocrystals Prepared by Microwave Combustion Method using Natural Black Pepper as Combustion Agent

Synergistic effects of lanthanum nanoarchitecture in nickel molybdate nanospheres obtained by single-pot microwave synthesis and their applications in high-end asymmetric devices

In this study, nickel molybdate nanosphere agglomerates with enhanced electrochemical performance were prepared using a rapid, time-saving, and scalable microwave combustion method by doping with different concentrations of La, and the effect of dopants on their structural, morphological, and electrochemical properties were investigated. Structural analyses demonstrated that the La dopant influenced the phase transformation from α-to β-NiMoO4. The electrochemical behaviors of all samples were tested in 3 M KOH electrolyte. The maximum specific capacitance obtained for 5% La doped NiMoO4 was 1264.64 F g−1 at 1 mA cm−2, which was almost 2.6 times higher than that for the pristine NiMoO4. The higher specific capacitance may have been due to the larger active surface area and greater abundance of reactive sites which depends on the morphological characteristics. A device fabricated with the 5% La doped sample had a maximum specific capacitance of 92.1 F g−1 and an energy density of 25.1 Wh kg−1 at 1 mA cm−2. The power density of the device was 5.3 kW kg−1 at a high current density of 25 mA cm−2, and 81.74% was retained after 10,000 cycles, thereby demonstrating the great potential for using this material in high-end energy storage applications.

Synthesis of ceria nanoparticles for the catalytic activity of cyclohexene epoxidation and selective detection of nitrite

Based on a few noteworthy features, cerium oxide nanoparticles have gained significance in nanotechnology. The effective microwave combustion method (MCM) and the conventional sol–gel (CRSGM) technologies are used in this study to successfully generate the crystalline CeO2 nanoparticles (NPs). Additionally, using a variety of spectroscopic and analytical methods, the synthesized CeO2 NPs are examined to assess to understand their structure and morphology. The XRD patterns of CeO2 NPs show that the structure exhibits a face-centered cubic lattice. Then, with demonstrated good conversion and selectivity, the impact of the epoxidation reaction of cyclohexene was examined. Finally, it can be said that using CeO2 nanoparticles is an efficient strategy to increase the catalytic activity toward the epoxidation reaction of cyclohexene. In the presence of acetonitrile as a solvent and H2O2 as an oxidant, the catalyst samples utilized in the cyclohexene epoxidation reaction were examined. In this study, the CeO2 catalyst outperformed all other catalysts in terms of cyclohexene maximal conversion and selectivity. After six prolonged cycles, the conversion of cyclohexene oxidation using CeO2 NPs shows reasonable recyclability and conversion efficiency, making it the best catalyst for an industrial production application.Additionally, the upgraded CeO2 nanoparticle electrode for nitrite detection has a linear concentration range (0.02–1200 M), a low detection limit (0.22 M), and a higher sensitivity (1.735 A M−1 cm−2). CeO2 NPs, on the other hand, have a quick response time, excellent sensitivity, and high selectivity. Additionally, the manufactured electrode is used to find nitrite in various water samples. Finally, it can be said that using CeO2 NPs is an efficient strategy to increase the catalytic activity toward cyclohexene oxidation and nitrite.

Synthesize and characterization of copper doped nickel ferrite nanoparticles effect on magnetic properties and visible light catalysis for rhodamine dye degradation mechanism

Copper doped NiFe2O4 spinel nanoparticles were prepared by facile microwave combustion method. The X-ray diffraction patterns showed that Cu-doping into NiFe2O4 spinel induced the formation of secondary α-Fe2O3 phase along with existing cubic structure. The cubic structure spinel nanoparticles possessed an average crystallite size in the range of 20 – 42 nm. The surface changes were evaluated using Zeta potential, it is found that Cu-doping NiFe2O4 spinel system can induce a negative shift in the flat-band potential and increases the isoelectric point 5.38–7.31. X-ray photoelectron spectroscopy (XPS) peak areas are often used to quantify the elemental compositions and oxidizing states of Cu-doped NiFe2O4 spinel materials surface. Morphological observations using scanning electron microscopy showed irregular shape with severe agglomerated distinct grain boundaries were occurred. An optical study, the band gap was found to decrease with an increase in the Cu2+ doping fraction. The presence of FT-IR spectra revealed bands at ≈ 548, 514 and 649 cm−1 were associated to the Ni–O (octahedral site) and Fe–O (tetrahedral site) stretching modes of Cu-doped NiFe2O4 spinel cubic structure. Magnetization–Field (M−H) hysteresis loops of Cu-doped NiFe2O4 spinel nanoparticles were exposed the appearance of soft ferromagnetic behavior at room temperature. The as-fabricated Cu-doped NiFe2O4 spinel nanoparticles were investigated for their superior photocatalytic degradation of rhodamine B under visible light irradiation for atmospheric conditions. It was found that the Cu-doping significantly enhanced the photocatalytic performance of bulk NiFe2O4. Moreover, with the increased ratio of Cu-doping into x = 0.4 up to an optimal value, the photocatalytic activity was maximized (efficiency increased from 88.26%, x = 0–99.85%, x = 0.4). The possible photocatalytic mechanism was critically discussed.

Enhanced microwave absorption capacity of iron-based catalysts by introducing Co and Ni for microwave pyrolysis of waste COVID-19 Masks

Inexpensive iron-based catalysts are the most promising catalysts for microwave-assisted deconstruction of waste plastics. However, the microwave heating efficiency of most of the synthesized iron-based catalysts is very low, in particular, the FeAl catalyst was prepared by microwave combustion method, and its mixture with disposable medical masks (DMMs) was only heated to about 150℃ within 10 min. Here, we introduce the second-phase metals (Co or Ni) into the FeAl catalyst, resulting in the rearrangement of the catalyst structure and electrons to give the catalyst good microwave absorption ability. The mixture of the catalyst and DMMs can be quickly heated to above 900℃ in 10 min, especially after reaching the melting point of plastic, the instantaneous heating rate reaches 350 ℃·min−1. under the unique microwave hot-spot pyrolysis mechanism, DMMs can be rapidly pyrolyzed into carbon nanotubes (19.65 wt%) and gas (77.65 wt%) within 14 min due to the efficient dehydrogenation efficiency and activity of Co. The corresponding H2 yield is up to 38.66 mmolH2·g−1DMMs, and the percentage of CO and H2 in the gas is as high as 90 wt%. This work improves the microwave conversion efficiency of iron-based catalysts by introducing second phase metals, and waste DMMs were efficiently converted into CO, H2 and CNTs, which can also be extended to other polymer or biomass chemical cycles.

Glassy magnetic freezing and exchange bias effect in NiCo2O4/(Co-Ni)O nanoparticles composite

An anomalous magnetic behavior and exchange bias effect are systematically studied for NiCo2O4/(Co-Ni)O nanoparticles synthesized by a microwave combustion method. Based on a complementary characterization by powder X-ray diffraction and high-resolution transmission electron microscopy, a composite of spinel Ni-cobaltite, NiCo2O4, and rock-salt-structured Co-Ni monoxide, (Co0.65Ni0.35)O, nanoparticles was synthesized in almost uniform elemental distribution. Optical absorbance measurements indicated multiple optical energy gaps with values of 2.02, 3.63 eV and 1.54, 4.015 eV attributed to the cobaltite and monoxide phases, respectively. A magnetic cluster-glass-like behavior with a blocking temperature of ∼ 75 K and irreversibility between the ZFC and FC magnetizations below ∼ 254 K were observed at low fields. An inherent exchange bias effect with significant shifts in both coercive field and remanent magnetization at temperatures up to room temperature is explored.

A comparative study on NiFe2O4 and ZnFe2O4 spinel nanoparticles: Structural, surface chemistry, optical, morphology and magnetic studies

A comparative investigation of the structural, optical, and magnetic properties of NiFe2O4 (NFO) and ZnFe2O4 (ZFO) spinel nanoparticles were synthesized by microwave combustion method. X-ray diffraction (XRD) showed that the ZFO spinel nanoparticles formed a cubic structure, but the NFO spinel nanoparticles formed with additional Fe2O3 in them. The average crystallite size was observed to be in the range 16–20 nm. X-ray photoelectron spectroscopy (XPS) peak areas are often used to quantify the elemental compositions and oxidizing states of NFO and ZFO spinel surfaces. The appearance of FT-IR bands at around 548, 514 and 649 cm−1 were correlated to the Fe–O and Zn/Ni–O stretching modes of cubic NFO and ZFO structure. The direct band gap estimated using Kubelka–Munk (K–M) method to obtain by the NFO is 3.35 eV and ZFO is 2.13 eV respectively. The surface morphology revealed nanosized crystalline grains with agglomerate separated particles that are like spherical/non-spherical forms and fused grain boundaries. Magnetic measurements of NFO and ZFO spinel nanoparticles showed ferromagnetic behavior at room temperature.

Microwave and combustion methods: a comparative study of synthesis, characterization, and applications of NiO nanoparticles

Synthesis of NiO NPs was achieved using microwave (MW) and solution combustion (SC) method, with the help of tender jackfruit extract as a green fuel. The efficiency of the two methods was compared by focusing on some of the important parameters like particle size, structure, optical property, photodegradation, supercapacitor, and sensing activity. Treatment of Nickel(II) nitrate hexahydrate solution with jackfruit extract, stable NiO NPs were obtained. Further, the characterization part involves PXRD, FTIR, UV, SEM, EDS analysis. PXRD patterns illustrate the FCC structure for NiO NPs for both methods and the crystallite size was obtained to be 3.9 nm and 3.8 nm. The FTIR spectra indicate the Ni-O stretching vibrations of synthesized NiO NPs. UV–Vis spectra shows the absorbance at 324 nm and 271 nm by SC and MW method, respectively. The bandgap energy of the MW method (2.3 eV) was more as compared to the combustion method (2.55 eV). Results of photodegradation experiments showed that MW synthesized NiO NPs were more effective as compared to SC synthesized NiO NPs against Rhodamine-B dye. Finally, impedance plots exhibit the supercapacitor activity and also NiO NPs showed excellent sensing activities.

Enhanced optical, magnetic, and photocatalytic activity of Mg2+ substituted NiFe2O4 spinel nanoparticles

Magnesium doped nickel ferrite spinel nanostructured were prepared using a microwave combustion method. The structural characterization by XRD analyses confirmed that undoped NiFe2O4 showed a single phase cubic spinel structure. However, with increasing Mg2+ concentration in the range 0.1 to 0.5 induced the crystallization of secondary α-Fe2O3 phase. The cubic nanostructured exhibited an average crystallite size between 20 and 35 nm. The presence of tensile/compressive strain in Mg2+ doped NiFe2O4 was determined from Williamson–Hall (W–H) method. The appearance of FT-IR bands at around 435, 459, and 581 cm−1, characteristics of spinel cubic and rhombohedral stretching modes. The optical band gap as determined by diffuse reflectance spectroscopy (DRS) decreases with increasing Mg2+ content due to the quantum confinement effect. Surface morphology showed nanosized crystalline grains agglomerated with spherical shapes and energy dispersive X-ray analyses was used to examine the elemental composition of the Mg2+ doped NiFe2O4 spinel nanoparticles and confirmed the presence of nickel, magnesium, iron and oxygen elements. Magnetization–Field (M − H) hysteresis curves revealed the appearance of ferromagnetic behavior at room temperature. The as-fabricated Mg2+ doped NiFe2O4 spinel nanostructures were evaluated for the photocatalytic degradation of rhodamine B under visible light irradiation for atmospheric conditions. When a small amount of H2O2 was added during photocatalysis, indicating the samples possessed photo-Fenton like catalytic activity. This type of spinel nanoparticles behaves as an efficient catalyst with high efficiency around above 99%.

A Facile Green Synthesis and Optical Characterization of Nano Zinc Aluminate Phosphor

This study presents a facile green synthesis of zinc aluminate nanophosphor by the microwave combustion method. Natural Piper nigrum seeds extract was used as a combustion agent. To study the effect of annealing temperature on structural, compositional, and optical properties of nano zinc aluminate, as-synthesized sample was further annealed at temperatures 700⁰C and 900⁰C. The structural and optical characterizations were carried out using XRD, UV-Vis DRS, FTIR, and PL spectroscopy. The XRD and FTIR confirmed the formation of nano zinc aluminate. The calculated average crystallite sizes were between 5-20 nm. The effective energy bandgap of prepared nano zinc aluminate was found to be 4.48 eV, larger than the bulk bandgap of zinc aluminate. Further, the effective band gap was increased with higher annealing temperatures. The PL spectra exhibited intense emission in the UV and blue region with weak emission in the red region.

Hard-templating design of mesoporous ZnAl2O4 via in-situ microwave combustion method as an efficient solar-light-responsive nanophotocatalyst for photo-decomposition of organic dyes from aqueous solution

The present research reports on design of mesoporous ZnAl2O4 nanophotocatalysts using various weight percentages of activated charcoal as a carbonaceous template in template-aided microwave-combustion method. The nanophotocatalysts were characterized through XRD, FESEM, TEM, EDX, BET-BJH, DRS, PL and pHpzc analyses. The characterization results demonstrated spongy-like and partially incomplete crystalline spinel structure of ZnAl2O4 nanophotocatalyst resulting from the formation of the more and larger secondary voids beside combustion pores with the suitable appeared surface and structural defects was successfully designed. Accordingly, the reaction pathway for hard-templating design of mesoporous ZnAl2O4 through microwave-combustion method was proposed. Moreover, to investigate the photocatalytic application of the prepared samples, the adsorption and photo-degradation proficiency of high-concentration orange II (AO7), congo red (CR) and methylene blue (MB) were tested. Within 160 min of simulated sunlight exposure, ZnAl2O4(AC = 5) sample showed the outstanding AO7 degradation of 85.7% which is about 22% higher than the sample prepared without using AC (ZnAl2O4(AC = 0)).

Influence of Ce3+ on the Structural, Morphological, Magnetic, Photocatalytic and Antibacterial Properties of Spinel MnFe2O4 Nanocrystallites Prepared by the Combustion Route

The present work describes the effect of Ce3+ ion doping on the structural, morphological, and magnetic properties of spinel manganese ferrite (MnFe2O4) nanocrystallites (NCs) using various instrument techniques. Rare earth element (REE) Cerium (Ce3+) doped MnFe2O4 NCs were prepared by a simple microwave combustion technique. In the present scenario, ferrites are widely used for photocatalytic dye degradation and antibacterial applications. Aiming to achieve this, we prepared Ce3+ doped MnFe2O4 NCs by microwave combustion method and urea as burning agent and the obtained powder samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), high resolution scanning electron microscope (HR-SEM), high resolution transmission electron microscope (HR-TEM) and vibration sample magnetometer (VSM) techniques. The pure spinel phase formation was confirmed by XRD analysis. FTIR spectra show two prominent absorption bands under 1000 cm−1, which confirms the formation of the spinel structure. HR-SEM and HR-TEM pictures demonstrated a sphere-shaped morphology and also expose the combination and agglomeration of grains, which are mostly due to the magnetic characteristics of the samples. The magnetic properties of the synthesized MnCexFe2−xO4 (x = 0.0, 0.1, 0.3, and 0.5) NCs were studied by VSM analysis at room temperature (RT) shows ferromagnetic behavior. The photodegradation results showed that MnFe2O4 and Ce doped MnFe2O4 NCs have a higher potential to degrade methylene blue (MB) and the sample MnCe0.3Fe1.7O4 NCs showed superb photocatalytic performance (91.53%) compared to other samples. The antibacterial activities of Gram-positive S. aureus, B. subtilis and Gram-negative K. pneumonia and E. coli were investigated using pure and Ce3+ substituted MnFe2O4 NCs and a higher activity for MnCe0.3Fe1.7O4 NCs than other samples was observed, which indicated that they can be used in biomedical applications.