α-Fe2O3 Nanocomposites Research Articles

Z-scheme driven charge transfer in g-C3N4/α-Fe2O3 nanocomposites enabling photocatalytic degradation of crystal violet and chromium reduction

In this study, we demonstrated the design and fabrication of iron oxide-embedded protonated graphitic carbon nitride (α-Fe2O3/p-g-C3N4) nanocomposites for photocatalytic dye degradation and heavy metal reduction applications under sunlight irradiation. The developed nanocomposites, with varying weight percentages of α-Fe2O3, were characterized for their structural (XRD, FTIR, XPS), optical (absorption and photoluminescence), morphological (FE-SEM, TEM), and electrochemical (EIS) properties to elucidate their structure-property relationships. The synthesis method ensures the uniform dispersion of α-Fe2O3 nanoparticles, with a particle size range of 50–60 nm, onto p-g-C3N4. XPS analysis suggests the formation of an electrical layer at the interface of α-Fe2O3/p-g-C3N4, facilitating the formation of a Z-scheme heterojunction. The photoluminescence and EIS spectra of the nanocomposite indicated effective separation and transfer of photo-induced charge carriers, aided by a reduced bandgap energy of ∼2.63 eV. Notably, the optimized 10 wt% α-Fe2O3/p-g-C3N4 nanocomposite exhibited superior photocatalytic activity, degrading nearly 100 % of crystal violate dye and reducing 98 % of Cr(VI) ions, compared to bare p-g-C3N4, which degraded around 43 % of the dye and reduced 39 % of Cr(VI) ions under sunlight irradiation. Scavenger studies indicated that α-Fe2O3/p-g-C3N4 nanocomposites produce adequate superoxide anions and hydroxyl radicals for dye degradation and heavy metal ion reduction. The composite also demonstrated consistent recyclability up to 5 cycles with around 100 % cyclical efficiency. The pH-dependent photoreduction and cyclic dye degradation by the 10 wt% α-Fe2O3/p-g-C3N4 photocatalyst indicated excellent stability, making it suitable for the treatment of multi-pollutant wastewater.

Elucidating the structural and spectroscopic attributes of titania-iron oxide (TiO2-([formula omitted]-Fe2O3)) nanocomposites: Showcasing a pulsed laser ablation in liquid approach

Various nanomaterials with tailored photo-electrochemical and physicochemical attributes became viable for the photo-catalysis and sensors applications. Thus, some new types of TiO2-(α-Fe2O3) nanocomposites were made via the pulse laser ablation in liquid method. These nanocomposites at each value of laser fluence were obtained by mixing the colloidal TiO2 nanoparticles and colloidal (α-Fe2O3) nanoparticles at equal ratio. The stability, structures, morphologies, and optical characteristics of the produced nanocomposites (suspended in deionized water) were customized by changing the laser fluence from 3.5–17.7 J cm−2. The high-resolution transmission electron microscopy micrographs showed the existence of homogeneous dispersion of spherical nanocrystallites (mean diameter 12.4 ± 6.0 nm) in the colloidal suspension. Both X-ray diffraction and Fourier transform infrared profiles of the specimen verified their purity and good nanocrystallinity. Two optical absorption peaks were probed in the range of 240 to 380 nm convoyed by a blue-shift. The spectral edge related to UV–Vis absorption was used to estimate the optical band gap of these nanocomposites. TiO2-(α-Fe2O3) nanocomposites made at optimum laser fluence (10.6 J cm−2) exhibited strong fluorescence with the life time decay of 3.64 μs, indicating the electronic density of states modification due to quantum size effects. The presence of Fe, Ti, and O in the X-ray photoelectron spectroscopy spectra reaffirmed the samples purity. The measured strong negative zeta potential (-33.1 mV) of the optimum TiO2-(α-Fe2O3) nanocomposites confirmed their excellent stability in the colloidal suspension. In short, these nanocomposites may be advantageous as good photo-catalysts for waste water treatment and photo-electrochemical uses.

Magnetically separable and visible light-driven photocatalytic activity of graphene oxide based α-Fe2O3 nanocomposite

This work investigates the impact of graphene oxide (GO) on the structural, morphological, optical, and photocatalytic investigations of Fe2O3, an excellent photocatalyst for industrial wastewater treatment. Using the straightforward and inexpensive sol-gel auto-combustion, hummer's method and sonication method, Fe2O3 nanoparticle (NPs), GO nanosheet, and GO-based Fe2O3 (GO/Fe2O3) nanocomposite have been synthesized, respectively. The XRD patterns, Raman spectra, and FTIR spectroscopy were used for the structural analysis, which verifies the single phase hexagonal geometry of Fe2O3 NPs. The average size of the crystallites is seen to have reduced from 50 nm to 44 nm for Fe2O3 and GO/Fe2O3. The SEM along with EDS were applied to investigate the surface morphology and confirm the existence of the elements Fe and O in pure Fe2O3, and C, Fe and O in GO/Fe2O3. From UV–vis absorbance spectra, the decrease in optical band gap (2.5 eV–1.9 eV) caused by GO incorporation has been inferred, as clearly displayed in the Tauc plots. X-ray photoelectron spectroscopy (XPS) confirms the presence of Fe2+/Fe+3 ionic states and large oxygen vacancies in the GO/Fe2O3 nanocomposite. The photocatalytic properties of both materials for the toxic MB (methylene blue) dye photodegradation in an aqueous solution was evaluated while being exposed to sunlight. It makes an excellent choice for wastewater treatment due to the high photocatalytic activity of magnetically separable GO/Fe2O3 nanocomposite for decomposing the MB dye.

Fabrication of highly catalytic active α-Fe2O3-carbon nanotube composites for thermal decomposition of ammonium perchlorate by light and temperature control strategy

For alleviating agglomeration of α-Fe2O3 nanoparticles and improving their catalytic activities as burning rate catalysts (BRCs) in solid propellants, Fe(CO)5 as the iron source was encapsulated into the inner space and/or loaded onto the outer surface of carbon nanotubes (CNTs) via ultrasonication with visible light and temperature control strategy. The Fe(CO)5-CNTs composites were subsequently transformed into α-Fe2O3-CNTs nanocomposites by Fe(CO)5 pyrolysis. The as-synthesized α-Fe2O3-CNTs composites were utterly characterized by HRTEM, SEM, BET, XPS, FTIR, Raman, and XRD. The catalytic combustion results show that the nanocomposites are highly active in boosting the thermal degradation of ammonium perchlorate (AP). α-Fe2O3&CNTs(S1) nanocomposite, the most excellent one, shifts left the peak temperature of the high-temperature decomposition (HTD) region of AP by 103.7 °C and increases its release heat by 190 %. Moreover, a carbon nanotube with a smaller outer diameter and higher iron content is conducive to enhancing AP thermal deterioration. A possible mechanism of AP decomposition with the addition of the nanocomposites was investigated by thermal decomposition dynamics, in-situ solid-state FTIR, and gas phase FTIR-MS technique. The mechanistic research implies that the produced NH3 and HClO4 gases can be absorbed on the nanocomposite surfaces to form more superoxide anions (O2−) during AP decomposition, accelerating the generation of NO from N2O and facilitating AP disintegration at a lower temperature. A tentative AP decomposition mechanism in the presence of the α-Fe2O3-CNTs nanocomposites is therefore proposed.

Ultraviolet light driven photocatalytic and antimicrobial activity of activated carbon-zirconium doped α-Fe2O3 nanocomposites

Ultraviolet light driven photocatalytic and antimicrobial activity of activated carbon-zirconium doped α-Fe2O3 nanocomposites

Multi-walled carbon nanotubes decorated polyaniline- α-Fe2O3 nanocomposite as an efficient photoanode for photoelectrochemical water splitting and photoelectrochemical cathodic protection of mild steel

In this research, polyaniline nanocomposites with iron (III) oxide and multi-walled carbon nanotubes (PANi-Fe and PANi-Fe-CNT) were synthesized and successfully characterized by various techniques such as X ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, Field emission scanning electron microscopy (FESEM), and X-ray energy dispersive spectroscopy (EDS). The photoelectrochemical (PEC) performance of PANi, α-Fe2O3 nanoparticles, PANi-Fe and PANi-Fe-CNT on indium tin oxide (ITO) substrate was evaluated by linear sweep voltammetry (LSV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) in the dark and under simulated sunlight (100 mW/cm2). The results showed that ITO/PANi-Fe-CNT photoanode had higher photocurrent density (1.05 mA/cm2), more significant applied bias photo-to-current efficiency percentage (0.16%), and smaller charge transfer resistance (1008 Ωcm2) than other photoanodes under light irradiation. To study the photoelectrochemical cathodic protection (PEC cathodic protection) properties, the pastes were prepared from synthesized compounds and doctor-bladed on the pre-treated titanium (Ti) substrates and used as the photoanodes for the protection of mild steel. The performance of the as-prepared photoanodes in photoelectrochemical cathodic protection of mild steel was investigated using electrochemical impedance spectroscopy (EIS) and Tafel polarization. The corrosion potential (Ecorr) of mild steel decreased from −706 mV (without connection to the photoanode) to −864 mV in the state of connection to Ti/PANi-Fe-CNT photoanode under light irradiation, which indicated its cathodic protection.

AuNPs and CNTs embellished three-dimensional bloom-like α-Fe2O3 nanocomposites for highly sensitive electrochemical pesticides detection

In this experimental study, a highly sensitive electrochemical acetylcholinesterase (AChE) biosensor for the detection of organophosphorus pesticides (OPs) based on three-dimensional α-Fe2O3 nanoflowers decorated with Au nanoparticles (AuNPs) and carbon nanotube (CNTs) (α-Fe2O3 NFs-AuNPs-CNTs) was developed. With the blooms structure, the α-Fe2O3 NFs not only provided an excellent microenvironment for the loading of AChE, but also increased the contact specific surface area. Meanwhile, AuNPs dispersed uniformly on the α-Fe2O3 nanosheets and CNTs further enhanced the conductivity of the nanocomposites. Under the optimized conditions, the biosensor was made to exhibit favorable linear relationship with the logarithm of the concentration of omethoate from 1 × 10−13-1 × 10−7 M, with the detection limit of 1.9 × 10−15 M. In addition, the biosensor also possessed good repeatability, stability and practicality, proved to be a valuable tool for the detection of pesticides in environment.

Controlled Synthesis of Ag-SnO2/α-Fe2O3 Nanocomposites for Improving Visible-Light Catalytic Activities of Pollutant Degradation and CO2 Reduction

The key to developing highly active α-Fe2O3-based photocatalysts is to improve the charge separation and efficiently utilize the electrons with sufficient thermodynamic energy. Herein, α-Fe2O3 nanosheets (FO) were synthesized using a metal-ion-intervened hydrothermal method and then coupled with SnO2 nanosheets (SO) to obtain SO/FO nanocomposites. Subsequently, nanosized Ag was selectively loaded on SO using the photo-deposition method to result in the ternary Ag-SO/FO nanocomposites. The optimal nanocomposite could realize the efficient aerobic degradation of 2,4-dichlorophenol as a representative organic pollutant under visible-light irradiation (>420 nm), exhibiting nearly six-fold degradation rates of that for FO. Additionally, the Ag-SO/FO photocatalyst is also applicable to the visible-light degradation of other organic pollutants and even CO2 reduction. By using steady-state surface photovoltage spectroscopy, fluorescence spectroscopy, and electrochemical methods, the photoactivity enhancement of Ag-SO/FO is principally attributed to the improved charge separation by introducing SO as an electron platform for the high-energy-level electrons of FO. Moreover, nanosized Ag on SO functions as a cocatalyst to further improve the charge separation and facilitate the catalytic reduction. This work provides a feasible design strategy for narrow-bandgap semiconductor-based photocatalysts by combining an electron platform and a cocatalyst.

Structural and optical properties of silver supported α-Fe2O3 nanocomposite fabricated by Saraca asoca leaf extract for the effective photo-degradation of cationic dye Azure B.

In recent decades, several nanocomposites developed by chemical synthetic routes, have been demonstrated as efficient photocatalysts for the photodegradation of hazardous organic dyes. The present investigation reports the sonochemical-assisted fabrication of silver-supported α-Fe2O3 nanocomposites (SA@Ag@IONCs) using the Saraca asoca leaf extract. The magnetic nanocomposites can be easily removed from the reaction mixture. The morphology of these materials was characterized by field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), XPS, BET surface area analyzer, UV-visible spectroscopy, photoluminescence, X-ray diffraction (XRD), and VSM techniques. The XRD and electron microscopy analyses revealed the small size and well-crystalline SA@Ag@IONC particles with spherical and buckyball structures. The large surface area of SA@Ag@IONCs was confirmed by BET analysis. The absorption edge in UV-visible spectra appeared to migrate towards high wavelengths for the SA@Ag@IONC composite, causing a change in the bandgap energy. In the case of the sonication assisted composite, the bandgap energy was 2.1 eV, making it easier for the electron to transfer from the valence band to conduction band. The decoration of ultrasmall silver onto the surfaces of the α-Fe2O3 nanocomposite, which considerably increases the capacity to absorb sunlight, enhances the efficiency of charge carrier separation, and inhibits the electron-hole recombination rate as confirmed by the reduced PL intensity, is responsible for the excellent photocatalytic degradation performance. Outcomes shown SA@Ag@IONCs have a high photodegradation rate as well as high-rate constant value at an optimized condition that is at pH 9 and 0.5 g L-1 dose of nanocomposite, photodegradation rate of Azure B is ∼94%. Trap experiment results indicated that O2˙- and h+ are the active species responsible for the photodegradation of AzB.

Flower-like 1T/2H-MoS2@α-Fe2O3 with enhanced electromagnetic wave absorption capabilities in the low frequency range

In this work, we designed the flower-like structure of 1T/2H-MoS2@α-Fe2O3 nanocomposites with high-efficiency microwave absorption, in which the α-Fe2O3 microdrums are attached to the surface of 1T/2H-MoS2 constituting flower-like morphology.

Removal and Recovery of Dissolved Oil from High-Salinity Wastewater Using Graphene–Iron Oxide Nanocomposites

We report the synthesis of reduced graphene oxide (rGO)-α-Fe2O3 nanocomposite and its application to remove and recover dissolved oil from a high-salinity oil–water emulsion in batch and column/breakthrough setups. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption characterized the synthesized nanocomposite’s structure, morphology, and surface properties. Both batch and continuous breakthrough adsorption studies were investigated. The effect of the adsorption parameters on the adsorption capacity and removal efficiency was analyzed. The rGO-Fe2O3 nanocomposite (rGO-Fe2O3-NC) demonstrated a superior adsorption capacity, both when measured experimentally (1213 mg/g) and predicted using the Freundlich isotherm (1301 mg/g). The adsorption process followed pseudo-second-order kinetic, and the rGO-Fe2O3-NC exhibited a very rapid removal, with more than 60% of oil being removed within 10 min. Breakthrough confirmed the exceptional removal capacities with good regeneration and cycling ability under a short contact time. Moreover, the adsorption capacity was enhanced with an emulsion salinity of up to 100,000 ppm, confirming the suitability for high-salinity wastewater.

Synthesis of carbon supported iron oxide nanochips and their composite with glutathione: A novel electrochemical sensitive material

In this study, bare iron oxide nanochips (NCs), carbon-supported iron oxide nanochips (C@α-Fe2O3), and glutathione-supported C@α-Fe2O3 nanocomposite (Glu/C@α-Fe2O3) were synthesized. As-synthesized materials were inspected using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), and a UV-visible absorption approach. Physical investigations confirmed the synthesis of rhombohedral phased α-Fe2O3, whereas FESEM certified nano-sized material formation. Voltammetry and impedance studies were used to evaluate and compare the electrochemical sensing activities. The electrochemical behavior of the Glu/C@α-Fe2O3 nanohybrid was investigated using differential pulse voltammetry (DPV) to identify their sensitivity towards 2-nitrophenol (2-NP) and 4-nitrophenol (4-NP). The stability of the square wave voltammetry SWV signals was detected in the range of 50–0.05 μM for both 2-NP and 4-NP. All electrochemical factors that influence the effectiveness of the developed sensors, including pH of the medium, accumulation time, and the influence of supporting electrolytes were thoroughly investigated. The sensor-based on our prepared electroactive material demonstrated remarkable electrocatalytic activity and good conductivity with a broad linear range, a low detection limit and high sensitivity for nitrophenol isomer reduction. We also tested the sensor for practical applications in water samples. These results showed that the suggested method could be used in the future to detect potentially dangerous environmental pollutants in water samples.

Gamma-ray shielding, electrical, and magnetic properties of α-Fe2O3/Al/HDPE nanocomposites

In this work, different ratios of iron oxide (α-Fe2O3) and aluminum metal (Al) nanoparticles in powder shape have been used to prepare HDPE nanocomposites for γ-rays shielding applications. The electrical and magnetic properties of prepared samples were investigated. The WinXCom and MCNP5 programs have been used to calculate the mass attenuation coefficients (μ ρ −1) of γ-rays for the prepared samples. The μ ρ −1 for the prepared samples have been measured experimentally via a narrow beam of γ-rays at energies of 662, 1173, and 1332 keV from 131Cs and 60Co radioactive sources. The impact of α-Fe2O3 and Al on the γ-ray shielding ability of prepared composites have been clarified. The exposure buildup factor (EBF) has been calculated at energies of 0.015, 0.1, 1, and 10 MeV using MCNP5 program. The results indicated that the fillers affected the EBF at photon energies less than 0.1 MeV. HDPE as a polymeric matrix shows very stability with non-polar features against temperature and frequency. However, the prepared nanocomposites show a remarkable enhancement of their dielectric and electrical properties. Furthermore, the magnetic measurements depict unsaturated weak ferromagnetic behavior for α-Fe2O3 nanocomposites, and diamagnetic characteristics for HDPE and Al. The HDPE-based nanocomposites showed improved electrical and magnetic properties along with improved ability to attenuate low-energy γ-rays compared to pure HDPE.

Synthesis of Ag-functionalized α-Fe2O3 nanocomposites for ppb-level triethylamine detection

It has been a challenging and urgent task to synthesize high-performance triethylamine (TEA) gas sensors with ppb-level detection. In this paper, Ag-functionalized α-Fe 2 O 3 nanocomposites with internal cavities were synthesized by successfully decorating Ag + on Fe 3+ covered carbonaceous microsphere (CMS) templates followed by a calcination step. The sample Fe-Ag-II had an extremely high response ( R a / R g = 822), a fast response (2 s), excellent selectivity, and long-term stability for 100 ppm TEA, and a high response to ppb-level TEA gas ( R a/ R g = 9.32–50 ppb) at 200 °C. The effect of relative humidity on TEA gas sensing sensors was investigated, which has rarely been reported before. Gas sensing tests revealed that CMS templates and the noble metal Ag could both improve sensing response while lowering the operating temperature. The mechanism of the enhanced gas sensing properties is discussed in detail. This work provides new strategies for the improvement of α-Fe 2 O 3 microstructure and the development of more practical TEA sensors. • Ag-functionalized α-Fe 2 O 3 nanocomposites were successfully synthesized. • Ag-functionalized α-Fe 2 O 3 nanocomposites responded significantly to ppb-level TEA. • The mechanism of sensing enhancement of CMS templates and Ag was investigated.

Enhanced photocatalytic degradation of methylene blue by nanocomposites prepared by laser ablation of Bi on CNT-α-Fe2O3 nanoparticles

The low conductivity and high combination rate of photogenerated electrons (e-) and photogenerated holes (h+) are the real challenges of photocatalysis. These problems could be mitigated by the synthesis of heterostructured nanocomposites (NCs). In this study, Bi@CNT-Fe2O3 nanocomposite was fabricated via pulsed laser ablation in liquid and characterized by UV–Vis spectroscopy, photoluminescence (PL), X-ray diffraction (PXRD) and field scanning electron microscopy (FESEM). These techniques revealed successfully the formation of CNT-α-Fe2O3 and Bi@CNT-α-Fe2O3 nanocomposites. The photocatalytic activities of the Fe2O3, CNT-α-Fe2O3, and Bi@CNT-Fe2O3 photocatalysts were evaluated by the degradation of methylene blue (MB) dye under ultraviolet (UV) light irradiation in the presence of a very low concentration of hydrogen peroxide (H2O2) as an oxidizing agent. The results show that the Bi@CNT-α-Fe2O3 NC has the highest photocatalytic degradation efficiency of MB which completes in 20 min of UV light irradiation. In addition, the obtained rate constants (min−1) of Bi@CNT-α-Fe2O3 NC were 1.3 and 3.4 times higher than those of CNT-α-Fe2O3 and α-Fe2O3. nanocatalysts, respectively.

Interfacial coupling effects in α-Fe2O3/g-C3N4 composite magnetically separable heterojunction with upgraded Z-scheme photocatalytic performance of mixed organic pollutant degradation

Photocatalysis has fascinated wide consideration due to its promising advantage in wastewater treatment. And the metal-oxides and g-C3N4 that possess Z-scheme heterojunctions have become the energetic photocatalysts (PCs) in degrading the organic impurities. In this work, a novel magnetic separable g-C3N4/α-Fe2O3 (GFE) nanocomposites (NCs) were fabricated by a facile hydrothermal strategy. Structural, morphological, optical, surface area and magnetic belongings of GFE composites were effectively explored using XRD, FT-IR, XPS, FESEM, HRTEM with EDX mapping, BET, UV-DRS and PL spectra. The (g-C3N4/20 wt % α-Fe2O3) GFE2 composite PCs were verified robust with significantly upgraded the photocatalytic efficiency for (anionic) RhB (97.2%) and (cationic) MB (90.6%) mixed aqueous organic pollutants degradation in 150 min under visible-light exposure, which was favourably higher than to GCN (65.2%) and α-Fe2O3 (16.6%) PCs. Moreover, the as-obtained GFE composite PCs also exposed great stability after five successive recyclabilities. The enhanced photo-degradation activity was largely ascribed to the extended visible-light fascination ability, high surface area, augmented active sites and strong redox ability relatively. Also, the energetic formation of α-Fe2O3 coupled g-C3N4 heterojunction that skilled the probable recombination rate and beneficial for the separation of photo-excited electron and hole (e−/h+) pairs based on active “Z-scheme” mechanism was liable for eliminating organic mixed pollutants.

Synthesis of Bi2O2.75/α-Fe2O3 Nanocomposite by Laser Ablation and Its Application for Catalytic Reduction of 4-Nitrophenol

Synthesis of Bi2O2.75/α-Fe2O3 Nanocomposite by Laser Ablation and Its Application for Catalytic Reduction of 4-Nitrophenol

Synthesis and Characterization of an α-Fe2O3-Decorated g-C3N4 Heterostructure for the Photocatalytic Removal of MO.

This study describes the preparation of graphitic carbon nitride (g-C3N4), hematite (α-Fe2O3), and their g-C3N4/α-Fe2O3 heterostructure for the photocatalytic removal of methyl orange (MO) under visible light illumination. The facile hydrothermal approach was utilized for the preparation of the nanomaterials. Powder X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET) were carried out to study the physiochemical and optoelectronic properties of all the synthesized photocatalysts. Based on the X-ray photoelectron spectroscopy (XPS) and UV-visible diffuse reflectance (DRS) results, an energy level diagram vs. SHE was established. The acquired results indicated that the nanocomposite exhibited a type-II heterojunction and degraded the MO dye by 97%. The degradation ability of the nanocomposite was higher than that of pristine g-C3N4 (41%) and α-Fe2O3 (30%) photocatalysts under 300 min of light irradiation. The formation of a type-II heterostructure with desirable band alignment and band edge positions for efficient interfacial charge carrier separation along with a larger specific surface area was collectively responsible for the higher photocatalytic efficiency of the g-C3N4/α-Fe2O3 nanocomposite. The mechanism of the nanocomposite was also studied through results obtained from UV-vis and XPS analyses. A reactive species trapping experiment confirmed the involvement of the superoxide radical anion (O2•−) as the key reactive oxygen species for MO removal. The degradation kinetics were also monitored, and the reaction was observed to be pseudo-first order. Moreover, the sustainability of the photocatalyst was also investigated.

Bioinspired Heteromultivalent Chitosan-α-Fe₂O₃/Gadofullerene Hybrid Composite for Enhanced Antibiotic-Resistant Bacterial Pneumonia.

Herein, we have designed and developed a heteromultivalent chitosan base α-Fe₂O₃/Gadofullerene (GdF) hybrid composite through a simple chemical precipitation method. Unlike other methods, the addition of external stabilizing agents to generate GdF nanoparticles (NPs) was not necessary herein. The prepared chitosan-α-Fe₂O₃/GdF hybrid nanocomposites were characterized using UV, FT-IR, XRD and morphological microscopic analyses. The results showed that α-Fe₂O₃ and GdF hybrid nanocomposites were successfully grown on the surface of chitosan. The FT-IR vibration peaks showed the formation of Fe₂O₃ NPs, and the vibration peak for Fe-O was 568 cm-1. The broad absorption peak observed in the range of 250-350 nm and a sharp absorption peak at 219 nm represents the UV absorption of the synthesized hybrid composites. XRD pattern showed sharp peaks of crystallinity and purity of α-Fe₂O₃ nanoparticles. Finally, the synthesized chitosan-α-Fe₂O₃/GdF hybrid composites were screened for their antibacterial resistance against the Escherichia coli, Pseudomonas aeruginosa, Bacilus subtilis, and Staphylococcus aereus. In addition, in vitro biocompatibility results exhibited that developed hybrid samples have provided high cell compatibility with fibroblast (L929) cell line. The in vivo bio inspired nanotherapeutics have the potential action to effective inhibition ability on antibiotic-resistant P. aeruginosa, which has been main factor of inducing pneumonia. In conclusion, we expect biomimicking systems combined with the effective antibacterial agent could be the suitable next generation therapeutic potential factors for prevention and treatment of antibiotic-resistant pneumonia.

Ternay Au@TiO2/α-Fe2O3 Nanocomposite with Nanoring Structure: Synthesis, Characterization and Photocatalytic Activity

Ternay Au@TiO2/α-Fe2O3 Nanocomposite with Nanoring Structure: Synthesis, Characterization and Photocatalytic Activity