MnFe2O4 Nanoparticles Research Articles

Surface Functionalization of MnFe2O4 Nanoparticles with Ethylenediamine for Hyperthermia Application

Biocompatible magnetic nanoparticles with enhanced heating proficiency are required for magnetic hyperthermia in order to use it efficiently in cancer treatment. In this paper, ethylenediamine functionalized monodispersed manganese iron oxide (MnFe2O4) nanoparticles were synthesized by using polyol method and functionalized nanoparticles were characterized by using X-ray diffraction, scanning electron microscope, transmission electron microscopy, vibrating sample magnetometry, fourier transform infrared spectroscopy and thermogravimetric analysis techniques for structural, morphological and magnetic analysis. Hyperthermia characteristics of functionalized MnFe2O4 nanoparticles were studied at 167.6, 251.4 and 335.2 Oe to assess the feasibility magnetic hyperthermia anticancer therapy. Outcome revealed that nanoparticles the self-heating temperature rise up to 48.76 to 56.34 °C at 5 and 10 mg mL-1 concentrations in water respectively. Specific absorption rate 94.65 W g-1 was observed at 5 mg mL-1 concentration. Biocompatibility study of functionalized nanoparticles has divulged almost no toxicity for nanoparticles.

Preparation and characterization of a novel Mn-Fe2O4 nanoparticle loaded on activated carbon adsorbent for kinetic, thermodynamic and isotherm surveys of aluminum ion adsorption

ABSTRACTThe focus of the current study is on the elimination of Al(III) ion from aqueous solutions by adsorption onto Mn-Fe2O4 nanoparticles loaded on activated carbon (Mn-Fe2O4-NPs-AC). Mn-Fe2O4 was synthesized by conventional co-precipitation method and then characterized using SEM, FT-IR, XRD and EDX techniques. The emphasis of the current study is on the optimal parameters that have been determined such as 2.5, 50 min, 50 mg, and 40 mg/L for pH, equilibrium time, adsorbent dosage and initial concentration. The obtained equilibrium data have best been fitted to the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (DR) adsorption isotherms (R2 = 0.9975).

Optimization of different wet chemical routes and phase evolution studies of MnFe2O4 nanoparticles

Abstract Facile and low cost micro-emulsion method for the synthesis of single phase manganese ferrite (MnFe2O4) nanoparticles was explored. In an attempt to synthesize monodisperse and single phase manganese ferrite (MnFe2O4) nanoparticles, micro-emulsion method using different oil phases such as dodecanol, toluene and low cost paraffin was adapted. Simple co-precipitation method was also followed for comparison purpose. In this facile approach, the strategy to control the particle size at nano-level has been explained in detail. Formation mechanism of single phase manganese ferrite and appearance of different phases (such as goethite, manganite, hematite, hausmanite, maghemite, magnetite, etc) by these synthesis methods have been investigated and discussed. The samples were annealed at various temperatures to probe the thermal stability. Effect of annealing under air and under vacuum was studied. Thermal gravimetric analysis (TGA) was used to study the phase transitions along with the investigation of appropriate annealing temperature for spinel ferrite formation. X-ray Diffraction (XRD) analysis was used to study the crystal structure and phase identification. Microstructural properties were studied using scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) was used to study the bond stretching (Metal-Oxygen) and cubic spinel structure of MnFe2O4.

Ruthenium Supported on Ionically Cross-linked Chitosan-Carrageenan Hybrid MnFe2O4 Catalysts for 4-Nitrophenol Reduction

Herein, we report a facile procedure to synthesize the hybrid magnetic catalyst (Ru@CS-CR@Mn) using ruthenium (Ru) supported on ionically cross-linked chitosan-carrageenan (CS-CR) and manganese ferrite (MnFe2O4) nanoparticles with excellent catalytic activity. The ionic gelation of CS-CR is acting as a protecting layer to promote the encapsulation of MnFe2O4 and Ru nanoparticles by electrostatic interactions. The presence of an active metal and a CS-CR layer on the as-prepared Ru@CS-CR@Mn catalyst was well determined by a series of physicochemical analyses. Subsequently, the catalytic performances of the Ru@CS-CR@Mn catalysts were further examined in the 4-nitrophenol (4-NP) reduction reaction in the presence of sodium borohydride (reducing agent) at ambient temperature. The Ru@CS-CR@Mn catalyst performed excellent catalytic activity in the 4-NP reduction, with a turnover frequency (TOF) values of 925 h−1 and rate constant (k) of 0.078 s−1. It is worth to mentioning that the Ru@CS-CR@Mn catalyst can be recycled and reused up to at least ten consecutive cycles in the 4-NP reduction with consistency in catalytic performance. The Ru@CS-CR@Mn catalyst is particularly attractive as a catalyst due to its superior catalytic activity and superparamagnetic properties for easy separation. We foresee this catalyst having high potential to be extended in a wide range of chemistry applications.

Structural, Morphological, Magnetic and Self-Heating Studies of One-Step Polyol Synthesized Manganese Ferrite (MnFe2O4) Nanoparticles

In this paper, uniform and superparamagnetic nanoparticles have been prepared using one-step polyol synthesis method. Structural, morphological and magnetic properties of obtained MnFe2O4 nanoparticles have been investigated by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA) techniques. Structural investigation showed that the average crystallite size of obtained nanoparticles was about 10[Formula: see text]nm. Magnetic study revealed that the nanoparticles were superparamagnetic at room temperature with magnetization 67[Formula: see text]emu/g at room temperature. The self-heating characteristics of synthesized MnFe2O4 nanoparticles were studied by applying external AC magnetic field of 167.6 to 335.2[Formula: see text]Oe at a fixed frequency of 265[Formula: see text]kHz. The SAR values of MnFe2O4 nanoparticles were calculated for 2, 5, 10[Formula: see text]mg[Formula: see text]mL[Formula: see text] concentrations and it is observed that the threshold hyperthermia temperature is achieved for all concentrations.

Fabrication of novel magnetic MnFe2O4/bio-char composite and heterogeneous photo-Fenton degradation of tetracycline in near neutral pH

Iron-based magnetic materials are deemed to be promising catalysts for various catalytic reactions and can be recovered conveniently by an external magnetic field. MnFe2O4 nanoparticle and MnFe2O4/bio-char composite with different bio-char contents were prepared to activate hydrogen peroxide for the degradation of tetracycline (TC). The catalysts were characterized by SEM, BET, XRD, FTIR, VSM and XPS. The results indicated that MnFe2O4 had a spherical shape and was successfully loaded onto the surface of bio-char. The introduction of bio-char effectively suppressed the aggregation of MnFe2O4 and drastically increased the specific surface area. Both MnFe2O4 and MnFe2O4/bio-char composite can be separated easily by an external magnetic field. Using 1:2 composite as heterogeneous photo-Fenton catalyst obtained a degradation of 95% through visible light irradiation of 40 mg L−1solution at natural pH (pH = 5.5) in the presence of 100 mmol L−1 H2O2 for 2 h. Free radical quenching experiment and the ESR results confirm that hydroxyl radicals play the main role for TC degradation. XPS measurements show that both Fe and Mn ions simultaneously participate in the activation of H2O2. The bio-char not only restrains the aggregation of MnFe2O4 leading to the improved removal efficiency of TC, but also has side effects by consuming hydroxyl radicals. By cyclic degradation experiments, the performance of MnFe2O4/bio-char composite is stable and almost unchanged, and the leaching metal ions of both Fe and Mn are neglectful (both below 0.2 mg L−1). Besides, steady performance of MnFe2O4/bio-char catalyst to remove TC from tap water and river water has been certified.

The effect of NH4OH pH on the synthesis of MnFe2O4 as heavy metal adsorbent by using co-precipitation method

The Fabrications of MnFe2O4 have been completed using co-precipitation method with NH4OH pH variations of 11.7; 12.0; and 12.7. The iron sand and the MnCl2.4H2O powder were mixed using HCl as solvent and NH4OH as setting solution. Then the samples were dried and characterized including: morphology analysis (FE-SEM), powder density, crystal size and structure (XRD), magnetic properties (VSM) and the absorption of Pb and Cu using Atomic Absorption Spectroscopy (AAS). The result of FE-SEM showed that the MnFe2O4 particles were agglomerated. On the other hand, the results of XRD characterization indicated that there is a dominant phase of MnFe2O4. The density powder characterization using a pycnometer suggested that the crystal grain size tends to decrease and the true density tends to increase with the increasing of NH4OH concentrations. The result of VSM showed that the optimum condition was achieved with the addition of NH4OH(pH of 12,7) where the magnetic properties characterizations indicate that the coercivity value, the magnetic saturation and the magnetic remanence of 1.96 emu/g are 43.82 Oe, 62.78 emu/g, and 1.96 emu/g, respectively. The AAS characterization suggested that the nanoparticles of MnFe2O4 were able to adsorb heavy metals, (Pb and Cu up to 197 mg/g).

Phosphotungstic acid supported on SiO2@NHPhNH2 functionalized nanoparticles of MnFe2O4 as a recyclable catalyst for the preparation of tetrahydrobenzo[b]pyran and indazolo[2,1-b]phthalazine-triones

MnFe2O4@SiO2@NHPhNH2–phosphotungstic acid was synthesized by the reaction of diamine-modified silica coated manganese ferrite nanoparticles with H3PW12O40, the Keggin-type heteropoly acid. This is the first time that H3PW12O40 supported on diamine functionalized MnFe2O4 nanoparticles has been reported. The synthesized catalyst was characterized by various techniques, including Fourier Transform Infrared Spectroscopy (FTIR), Transmission electron-microscopy (TEM), X-ray Powder Diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDX), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), Thermogravimetric Analysis (TGA), and Vibrating Sample Magnetometer (VSM). The synthesized nanoparticle was examined as the heterogenous nanocatalyst for the synthesis of tetrahydrobenzo-[b]-pyran derivatives and 2H-indazolo-[2,1-b]-phthalazine-triones under the solvent-free heating or ultrasonic irradiation conditions. This method offers several advantages including high yield, low reaction times, and the simple work-up procedure due to the presence of the magnetic nanoparticles in this catalyst, so that, it can be easily recovered and reused for at least six successive times without the loss of its high catalytic activity, suggesting its great Potential for industrial applications.

Manganese ferrite nanoparticle production from industrial wastes as sorbent material for arsenic removal from aqueous solutions

Manganese ferrite nanoparticles were prepared by microwave-sonication assisted hydrothermal route and produced from wastes of Li-ion batteries and pyrite ash. The leaching solution of waste pyrite ash was used as the Fe source while the Mn-bearing solution recovered from the Li-ion battery recycling process was used as the Mn source. X-ray diffractometry showed that manganese ferrite can be obtained as single crystalline phase. Scanning electron microscope images showed that double-pyramid or octahedral particles were formed with an average size of 24.3 nm. These MnFe2O4 nanoparticles demonstrated good sorption capacity toward As (101 ± 0.5 mg/g at pH 3).

Chemical synthesis of MnFe2O4/chitosan nanocomposites for controlled release of ofloxacin drug

In this study, we synthesized ofloxacin‐loaded MnFe2O4 nanoparticles (NPs) surface modified with chitosan (CS‐MnFe2O4) for prolonged antibiotic release in a controlled manner. It was found that the synthesized CS‐MnFe2O4 was spherical in shape with an average size of 30–50 nm, low aggregation, and good magnetic responsibility. An in vitro drug loading and release kinetics study reveals that the drug delivery system can take 86% of drug load and can release ofloxacin over a sustained period of 3 days. The release kinetics study reveals that the drug follows zero order kinetics and the mechanism of drug release is diffusion‐controlled type. These results indicated that CS‐MnFe2O4 NPs with pH‐sensitive properties can be used as candidates for intestinal targeted drug delivery through oral administration by avoiding the drug release in the highly acidic gastric fluid region of the stomach.

Coaxial-Nanocable Structured MnFe2O4 Based on Polydopamine-Modified MWCNT for Anode Materials of Lithium-Ion Batteries

Energy storage technology for lithium-ion batteries (LIBs) has made rapid progress, and has been applied in a wide range of applications such as portable electric devices, hybrid electric vehicles (HEVs) or electric vehicles (EVs) even in large-scale energy storage system (ESS). Nevertheless, the electrode materials still require the enhancement on its energy or power densities for satisfying the needs of global market. Meanwhile, research on high-capacity anode materials beyond the low theoretical capacity limit of 372 mA h g-1 of commercialized graphite materials is performed actively in numerous research groups. As one of the alternative candidates, transition metal oxides have strong advantages, which can substitute the graphite materials, such as high theoretical capacity (≥500 mA h g-1), earth abundant and simple preparation process. However, the charge/discharge process of “conversion reaction”, which is typically shown in oxide-based anode materials, causes lower cyclability resulted by repetitive volume change in the reaction process. Also, oxide materials generally exhibit lower electrical conductivity than carbon or metal-based anode materials. Recently, metal ferrites (MFe2O4, M = Mn, Co, Ni, Zn) show higher level of electric conductivity and chemical stability from the modified electronic structure which is resulted by doping of foreign metal atoms. Among the various metal ferrites, MnFe2O4 is attractive anode material, because it shows high theoretical capacity of 917 mA h g-1, and it consists of low cost Mn, Fe elements. In our work, to compensate for the limitations of oxide materials using MnFe2O4 nanoparticles, we have introduced two representative technologies of nano-structuring and carbon composite to improve the rate capability and cycle performance of the ferrite system. In particular, we also have introduced polydopramine (PDA) coating technique using versatile properties of the polydopamine such as high hydrophilicity and adhesive ability from rich functional groups (e.g. –OH catechol, –NH2 amine). Mussel-inspired PDA is well known as its strong adhesion to organic/inorganic surfaces, good environmental stability, biocompatibility, and excellent dispersibility in water. In this regard, we applied the PDA coating layer to carbon nanotubes (CNTs) to mitigate the strong inner-tube van der Waals interactions, and it helps to fabricate coaxial nanocable structures with increased dispersibility in the precursor solution of the MnFe2O4. In our process, metal ions in the solution are attracted by –OH catechol groups in PDA layer, and MnFe2O4 nanoparticles are co-precipitated at low temperature (98 oC) around CNT surfaces. Eventually, the nanoparticles are attached on the CNT by PDA layer. As a result, well defined coaxial nanocable structures, which is composed of MnFe2O4 nanoparticles and CNT core, were successfully prepared without a particle aggregation after our synthesis process. These coaxial nanocable anode materials effectively supply electrons through the CNT core with well contacted MnFe2O4 nanoparticles on the surface by the aid of the strong adhesive ability of the polydopamine coating layer. Besides, increased surface area for a facile electrolyte penetration provides better Li+ ion kinetics with an enhanced ionic conductivity. Furthermore, homogeneous CNT matrix can accommodate volume changes in the repetitive conversion reaction, and improves the cyclic stability of anode materials.

Comparative Heating Efficiency of Cobalt-, Manganese-, and Nickel-Ferrite Nanoparticles for a Hyperthermia Agent in Biomedicines.

In this study, the ac magnetic hyperthermia responses of spinel CoFe2O4, MnFe2O4, and NiFe2O4 nanoparticles of comparable sizes (∼20 nm) were investigated to evaluate their feasibility of use in magnetic hyperthermia. The heating ability of EDT-coated nanoparticles which were dispersed in two different carrier media, deionized water and ethylene glycol, at concentrations of 1 and 2 mg/mL, was evaluated by estimating the specific loss power (SLP) (which is a measure of magnetic energy transformed into heat) under magnetic fields of 15, 25, and 50 kA/m at a constant frequency of 195 kHz. The maximum value of SLP has been found to be ∼315 W/g for CoFe2O4 and ∼295 W/g for MnFe2O4 and NiFe2O4 nanoparticles. We report very promising heating temperature rising characteristics of CoFe2O4, MnFe2O4, and NiFe2O4 nanoparticles under different applied magnetic fields that indicate the effectiveness of these nanoparticles as hyperthermia agents.

Controlled assembly of MnFe2O4 nanoparticles on MoS2 nanosheets by a facile sonochemical method

Abstract This study established a facile one-step strategy to anchor MnFe2O4 nanoparticles on the surface of MoS2 nanosheets in a controlled manner. The as-prepared MnFe2O4/MoS2 nanocomposites were investigated by TEM, XRD, XPS, Raman, BET and VSM in detail. The MnFe2O4 nanoparticles with an average particle size of 26 nm were densely and uniformly decorated on MoS2 nanosheets, and consequently, both the aggregation of MnFe2O4 nanoparticles and restacking of MoS2 nanosheets were effectively prevented. More importantly, the MnFe2O4/MoS2 nanocomposites exhibited high specific surface area, typical superparamagnetic behavior and excellent solution dispersion, showing a great potential for biomedical applications in the fields of magnetic resonance imaging, targeted drug delivery and tumor hyperthermia.

Facile Preparation of Iron-Manganese Oxide@Diatomite Composite for Effective Removal of Vanadium from Wastewater

Excess pentavalent vanadium(v) has severely degraded water quality and posed a huge threat to human health over the past several decades. Hence, it’s urgent and significant to explore a novel adsorbent which is low cost and efficient to treat vanadium pollution. In this work, a novel iron-manganese oxide@diatomite (MnFe2O4@DE) adsorbent with superior removal performance for simulated vanadium(v) wastewater was synthesised via a facile hydrothermal method. The as-prepared MnFe2O4@DE composite was characterised through different characterisation techniques. The results indicated that the MnFe2O4 nanoparticles were uniformly deposited on the surface of diatomite, resulting in a larger specific surface area and pore volume of the composite. In addition, the MnFe2O4@DE adsorbent exhibited the highest adsorption capacity for vanadium(v) (18.37mgg−1±0.5%), which was up to around 13.24 and 1.33 times as much as that of pure diatomite and MnFe2O4, respectively. This is mainly attributed to the enhanced specific surface area and pore volume. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis demonstrated vanadium(v) could be reduced to low valence vanadium with low toxicity by the MnFe2O4@DE composite which could exist as VO2+ and VO+ cations in solution. The adsorption process was better fitted with a pseudo-second-order kinetic model and Langmuir model, which is spontaneous and endothermic. Overall, the novel MnFe2O4@DE composite could be applied as a promising adsorbent in addressing vanadium pollution issues due to its properties of low cost, effectiveness, and environmental friendliness.

The azide–alkyne cycloaddition catalysed by transition metal oxide nanoparticles

Fe3O4, MnFe2O4, CoFe2O4, MnO, and α-MnS nanoparticles catalyse the title reaction by the ligation of the azide on the surface of the nanoparticle.

MnFe2O4-decorated large-pore mesoporous silica-coated upconversion nanoparticles for near-infrared light-induced and O2 self-sufficient photodynamic therapy.

The limited light penetration depth and tumor hypoxia are two natural shortcomings of photodynamic therapy (PDT). Overcoming these two issues within a single system is still a great challenge. Herein, photosensitizer (PS)-loaded and PEG-modified MnFe2O4-decorated large-pore mesoporous silica-coated β-NaYF4:20%Yb,2%Er@β-NaYF4 upconversion nanoparticles (UCMnFe-PS-PEG) as excellent PDT agents are successfully prepared for NIR light-mediated and O2 self-sufficient PDT. The large mesoporous structure observably increases PS loading efficiency (11.33 wt%) and the green luminescence from upconversion nanoparticles activated by NIR is able to activate PSs to generate ROS effectively. In addition, sub-10 nm MnFe2O4 nanoparticles work as a Fenton catalyst to generate O2in situ. In vivo experiments further prove that UCMnFe-PS-PEG not only provides magnetic guidance to the tumor, but also overcomes tumor hypoxia and dramatically enhances PDT efficiency. Furthermore, in vivo MR and UCL imaging are performed for accurate cancer therapy. We believe that the successful construction of the multifunctional UCMnFe-PS-PEG provides more revelations for developing advanced nano-drug systems for cancer therapy.

Mg-Al-La LDH-MnFe2O4 hybrid material for facile removal of anionic dyes from aqueous solutions

The urea hydrolysis method was applied to prepare Mg-Al-La layered double hydroxides (LDH) and its hybrids with different amounts of magnetic MnFe2O4 nanoparticles. The new hybrid materials were characterized by X-ray powder diffraction, FTIR and Raman spectroscopy, AFM, SEM, TEM/EDX microscopic methods, BET specific surface area determination and inductively coupled plasma (ICP). The AFM and TEM/EDX analyses clearly showed MnFe2O4 nanoparticles to be predominantly localized on the surface of LDH sheets. Almost two-fold increase of the specific surface area was observed for the Mg-Al-La LDH-MnFe2O4 hybrids compared to the pristine LDH. All synthesized hybrids were studied for their adsorption capacities of Acid orange 7 dye. The adsorption studies were measured at pH 4.0, 7.0 and 10.0. The resulting data were fitted by Langmuir and Langmuir-Freundlich models. The Langmuir isotherm model exhibited a maximum adsorption capacity of Acid orange 7 dye (687.9 mg/g) for Mg-Al-La LDH-MnFe2O4 hybrid material. The lower pH positively affected higher adsorption capacity of Acid orange 7 dye. The prepared Mg-Al-La LDH-MnFe2O4 hybrid materials thus showed to be new promising adsorbents of anionic dyes.

Improved heating efficiency of bifunctional MnFe2O4/ZnS nanocomposite for magnetic hyperthermia application

MnFe2O4/ZnS magneto-fluorescent nanocomposite were synthesized by simple co-precipitation method and its structural, morphological, optical and magnetic characterization were done by XRD, HRTEM, FTIR and VSM techniques. The presence of MnFe2O4 and ZnS in the nanocomposites was confirmed by XRD. Magnetic study shows that the nanoparticles manifest near superparamagnetic behaviour with a small coercivity of ∼66 G at room temperature and saturation magnetization significantly increases after coating ZnS on the surface of MnFe2O4 core. The FTIR study confirms the incorporation of ZnS nanoparticles on the surface of MnFe2O4 nanoparticles. PL spectra demonstrated the red shifted emission of nanocomposites as compared with that of pure ZnS. The heating efficiency of the nanocomposites is measured by its SAR and ILP values. This study exhibits the quantitative link between the sizes and saturation magnetization which is intimately intertwined with the heating efficiency of the nanoparticles.

Clustering of MnFe2O4 nanoparticles and the effect of field intensity in the generation of heat for hyperthermia application

MnFe2O4 nanoparticles thinly coated with oleic acid were successfully synthesized via a co-precipitation technique. Morphological analysis shows the co-existence of different nanoparticle assemblies such as dense agglomeration, chain clustering, and random clustering, the effect of which was then reflected in the FTIR spectrum and magnetization behavior of the MnFe2O4 nanoparticles. Induction heating study collectively discusses the association of dipolar energy and magnetic anisotropy energy with the applied field intensity in various nanoparticle clustering systems. The highest applied field intensity (H250: 14.98 kAm−1) at a nanoparticle concentration of 2 mg ml−1 shows a maximum specific absorption rate of 98.37 W g−1, which is attributed to the effect of threshold field amplitude surpassing the dipolar field energy. The nanoparticle clustering due to an interdigitated effect and chain clustering can effectively contribute to heat generation via Neelian and hysteresis loss mechanism at a suitable high field intensity.

Synthesis and Enhanced Photocatalysis of Magnetic Reduced Graphene Oxide-MnFe2O4 Nanohybrids

Background: The hybrid photocatalysts constructed with various semiconductor and graphene can show dramatically enhanced photocatalytic activities. The separability of a photocatalyst from degraded pollutant aqueous solution is very important in some cases. Objective: The magnetic MnFe2O4 nanoparticles and reduced graphene oxide were used to construct magnetically separable (rGO)-MnFe2O4 hybrids with high photo- catalytic properties. Method: The pure MnFe2O4 nanoparticles and rGO/MnFe2O4 hybrid photocatalysts were synthesized with a facile hydrothermal process. Results: The nanoparticles showed great sunlight-excited photocatalytic and Fenton- like photocatalytic activities in the photodegradation of dye solution. Introducing rGO resulted in further enhancement of the activity compared to the nanoparticles. The effect of initial dye solution pH and H2O2 on the activities were also studied. The greater activities of the hybrids are ascribed to good interface charge transfer that was verified by the estimation of optical conductivity and band energy level. The hybrids also showed an magnetically separable performance from degraded pollutant solution. Conclusion: This work suggested a facile method to synthesize the magnetic MnFe2O4 nanoparticles and rGO/MnFe2O4 hybrids. The hybrids are an promising photocatalytic materials for environmental applications.