Physical and magnetic properties of iron oxide nanoparticles with a different molar ratio of ferrous and ferric

Mazrouaa, Azza M.; Mohamed, Manal G.; Fekry, Mohamed

doi:10.1016/j.ejpe.2019.02.002

Cited by 53 publications

(20 citation statements)

References 31 publications

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“…Literature findings showed that FTIR spectra of magnetite, which exhibits two strong infrared absorption bands at 570 cm −1 (υ1) and 390 cm −1 (υ2), can be assigned to the Fe-O stretching mode of the tetrahedral and octahedral sites for the υ1 band and the Fe-O stretching mode of the octahedral sites for the υ2 band 22 . These main Fe-O vibration bands may differ as function of various factors related to magnetite synthesis protocol, oxidation, stoichiometry of magnetite (Fe(II)/Fe(III) ratios), etc [23][24][25][26][27][28][29][30][31] . As an example, FTIR investigation of hydrothermally synthetized magnetite showed the two absorption bands at 584 cm −1 and 442.03 cm −1 respectively 32 .…”

Section: Resultsmentioning

confidence: 99%

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

Neamţu

Nădejde

Brinza

et al. 2020

Sci Rep

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the catalytic behavior of iron phthalocyanine (fepc)-sensitized magnetic nanocatalysts was evaluated for their application in the oxidative treatment of Bisphenol A (BpA) under mild environmental conditions. two types of fepc (fe(ii)pc and fe(iii)pc), which are highly photosensitive compounds, were immobilized on the surface of functionalized magnetite. the nanomaterials were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (ftiR) and thermogravimetric analyses (tGA). the generation of singlet oxygen by nanomaterials was also investigated. In the presence of UVA light exposure (365 nm) and 15 mM H 2 o 2 , the M@Fe(III)Pc photocatalyst gave the best results; for a catalyst concentration of 2.0 g L − 1 , around 60% BPA was removed after 120 min of reaction. These experimental conditions were further tested under natural solar light exposure, for which also M@fe(iii)pc exhibited enhanced oxidative catalytic activity, being able to remove 83% of BPA in solution. The water samples were less cytotoxic after treatment, this being confirmed by the MCF-7 cell viability assay. Emerging recalcitrant organic pollutants received extensive attention over the years, since they are difficult to remove using conventional technologies. Continuous efforts are made to find improved solutions for fighting against and for diminishing environmental pollution. Endocrine disruptive chemicals (EDC) are a class of hazardous persistent pollutants exhibiting numerous harmful effects, able to induce subtle and irreversible changes in living organisms, even in concentrations of few parts per billion 1,2. Bisphenol A (BPA) is an EDC that remains a major water contaminant, since its production in the 1950s. Since then, BPA become a well-established model compound for persistent micropollutants. Although found in low concentration in water, its removal proved to be unsuccessful using conventional water treatment approaches, such as chlorination and ozonation, processes that also exhibit several drawbacks 3. Promising alternatives, such as photocatalysis 1,4-6 , were found to be very efficient and versatile. For instance, photocatalysis involving dye-sensitization represents an eco-friendly approach with great potential for very efficient removal of persistent hazardous pollutants from waters. Singlet oxygen, a reactive oxygen species (ROS), has proved to be an extremely effective agent in the oxidation of emerging pollutants, due to its high oxidation ability. Organic phthalocyanines (Pcs) are the synthetic analogues of natural porphyrine compounds 7. Discovered in 1928, Pcs, possessing a two-dimensional geometry and a ring system consisting of 18 π-electrons, are composed of four isindole units linked by nitrogen atoms. Due to the large, aromatic, macrocyclic structure of Pc, a variety of metals (Me), such as Fe 8-10 , Zn 11,12 , Cu 13,14 , Mn, Co, Ni 15,16 , Si 17 , Ru 18 , can be bonded inside the cycle of Pc, substituting the two hydrogen atoms. These ...

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Section: Resultsmentioning

confidence: 99%

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

Neamţu

Nădejde

Brinza

et al. 2020

Sci Rep

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“…Magnetite (Fe 3 O 4 ) iron-oxide nanoparticles were synthesized by the co-precipitation route with slight modifications to the described methodology [ 34 , 35 ]. Both FeCl 3 ·6H 2 O (80 mmol) and FeCl 2 ·4H 2 O (40 mmol) were added to a round bottom flask containing 200 mL of anoxic double distilled water.…”

Section: Experimental Methodologymentioning

confidence: 99%

Effect of Iron-Oxide Nanoparticles Impregnated Bacterial Cellulose on Overall Properties of Alginate/Casein Hydrogels: Potential Injectable Biomaterial for Wound Healing Applications

et al. 2020

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In this study we report the preparation of novel multicomponent hydrogels as potential biomaterials for injectable hydrogels comprised of alginate, casein and bacterial cellulose impregnated with iron nanoparticles (BCF). These hydrogels demonstrated amide cross-linking of alginate–casein, ionic cross-linking of alginate and supramolecular interaction due to incorporation of BCF. Incorporation of BCF into the hydrogels based on natural biopolymers was done to reinforce the hydrogels and impart magnetic properties critical for targeted drug delivery. This study aimed to improve overall properties of alginate/casein hydrogels by varying the BCF loading. The physico-chemical properties of gels were characterized via FTIR, XRD, DSC, TGA, VSM and mechanical compression. In addition, swelling, drug release, antibacterial activity and cytotoxicity studies were also conducted on these hydrogels. The results indicated that incorporation of BCF in alginate/casein hydrogels led to mechanically stronger gels with magnetic properties, increased porosity and hence increased swelling. A porous structure, which is essential for migration of cells and biomolecule transportation, was confirmed from microscopic analysis. The porous internal structure promoted cell viability, which was confirmed through MTT assay of fibroblasts. Moreover, a hydrogel can be useful for the delivery of essential drugs or biomolecules in a sustained manner for longer durations. These hydrogels are porous, cell viable and possess mechanical properties that match closely to the native tissue. Collectively, these hybrid alginate–casein hydrogels laden with BCF can be fabricated by a facile approach for potential wound healing applications.

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“…On the other hand, they require expensive instrumentation and involve time‐consuming procedures. Electrochemical methods represent another class of widely used techniques for the detection of metal ions . Carbon paste electrodes (CPEs) are suggested as very useful end point indicator electrodes in the potentiometric titration of metal ions .…”

Section: Introductionmentioning

confidence: 93%

Construction and characterization of nano iron complex ionophore for electrochemical determination of Fe(III) in pure and various real water samples

Ali

Mahmoud

2019

Applied Organom Chemis

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Electrochemical methods represent an important class of widely used techniques for the detection of metal ions. The unique chemical and physical properties of nanoparticles make them extremely suitable for designing new and improved sensing devices, especially electrochemical sensors and biosensors. This study focused on the synthesis of a nano-Fe(III)-Sud complex and its characterization using various spectroscopic and analytical tools, optimized using the density functional theory method, screened for antibacterial activity and evaluated for possible binding to DNA using molecular docking study. Proceeding from the collected information, nano-Fe(III)-Sud was used further for constructing carbon paste and screen-printed ion-selective electrodes. The proposed sensors were successfully applied for the determination of Fe(III) ions in various real and environmental water samples. Some texture analyses of the electrode surface were conducted using atomic force microscopy. At optimum values of various conditions, the proposed electrodes responded towards Fe(III) ions linearly in the range 2.5 × 10 −9 -1 × 10 −2 and 1.0 × 10 −8 -1 × 10 −2 M with slope of 19.73 ± 0.82 and 18.57 ± 0.32 mV decade −1 of Fe(III) ion concentration and detection limit of 2.5 × 10 −9 and 1.0 × 10 −8 M for Fe(III)-Sud-SPE (electrode I) and Fe(III)-Sud-CPE (electrode II), respectively. The electrode response is independent of pH in the range 2.0-7.0 and 2.5-7.0, with a fast response time (4 and 7 s) at 25°C for electrode I and electrode II, respectively.Moreover, the electrodes also showed high selectivity and long lifetime (more than 6 and 3 months for electrode I and electrode II, respectively). The electrodes showed good selectivity for Fe(III) ions among a wide variety of metal ions. The results obtained compared well with those obtained using atomic absorption spectrometry.

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Physical and magnetic properties of iron oxide nanoparticles with a different molar ratio of ferrous and ferric

Cited by 53 publications

References 31 publications

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

Iron phthalocyanine-sensitized magnetic catalysts for BPA photodegradation

Effect of Iron-Oxide Nanoparticles Impregnated Bacterial Cellulose on Overall Properties of Alginate/Casein Hydrogels: Potential Injectable Biomaterial for Wound Healing Applications

Construction and characterization of nano iron complex ionophore for electrochemical determination of Fe(III) in pure and various real water samples

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