Investigation of solid phase upon γ-irradiation of ferrihydrite-ethanol suspension

Jurkin, Tanja; Zadro, Krešo; Gotić, Marijan; Musić, Svetozar

doi:10.1016/j.radphyschem.2011.02.031

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…Generally, the γ-radiolytic synthesis is a powerful technique for the synthesis of noble metals [29][30][31][32] and metal oxide nanoparticles [33][34][35][36] Typically, throughout the γ-irradiation synthesis approach various polymers and surfactants can be used as nanoparticle dispersants, surface stabilizers, growth modifiers, and reducing agents [29,31,36,37]. Polymers inhibit coalescence and aggregation of metal oxide NPs through steric hindrances or electrostatic repulsion.…”

Section: Introductionmentioning

confidence: 99%

Radiolytic synthesis of manganese oxides and their ability to decolorize methylene blue in aqueous solutions

Mikac

Marić

Štefanić

et al. 2019

Applied Surface Science

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In this work, manganese oxide nanoparticles were radiolytically synthesized in the presence or absence of diethylaminoethyl-dextran hydrochloride (DEAE-dextran). Deoxygenated potassium permanganate (KMnO 4 ) alkaline aqueous suspensions were used as a precursor. The dose rate was~32 kGy h −1 and the absorbed doses were 100 and 200 kGy. The XRD patterns showed broad peaks indicating the low crystallinity and/or amorphous character of synthesized manganese oxides samples. The radiolytically synthesized samples in the presence of DEAE-dextran contained a mixture of phases, namely Mn 2 O 3 , Mn 3 O 4 and an amorphous phase. The samples radiolytically synthesized with no added polymer consist of K 0.27 MnO 2 ۰ 0.54 H 2 O and Mn 3 O 4 (hausmannite). The volume average domain size of hausmannite was estimated to~45 nm using Scherrer equation and Williamson-Hall plots. The hydrodynamic diameters and zeta potential of the samples were measured. The pore radius distributions and pore volume of the obtained manganese oxides were determined by N 2 adsorption-desorption measurements. The synthesized manganese oxide samples were applied for decolorization of methylene blue (MB) aqueous solutions at pH = 2. The MB concentrations in the supernatant solutions were determined through the measurements of the UV-Vis absorbance intensities at a wavelength of 663 nm. The radiolytically synthesized Mn 3 O 4 NPs in the absence of DEAE-dextran polymer (zeta potential of −39.4 mV, BET surface area of 234 m 2 g −1 and pore volume of 1.52 cm 3 g −1 ) showed the highest MB decolorization effect.

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Section: Introductionmentioning

confidence: 99%

Radiolytic synthesis of manganese oxides and their ability to decolorize methylene blue in aqueous solutions

Mikac

Marić

Štefanić

et al. 2019

Applied Surface Science

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“…The ZFC and FC curves of samples S2 and S4 show irreversible behavior and high divergence up to 300 K regardless of the morphology of the particles, which confirms the exceptional intrinsic room-temperature magnetic properties of -FeOOH with the Curie temperature of both samples above 300 K. In this work, iron(III) chloride aqueous colloidal solutions (pH  9) in the presence of 2-propanol and amino-dextran (DEAE dextran) were deoxygenated by nitrogen and then γirradiated at doses of 36 and 130 kGy. The addition of 2-propanol and bubbling with nitrogen gas highlighted the reducing conditions upon -irradiation [11,12,[53][54][55][56] and one would expect the reduction of Fe(III) precursor to Fe(II)-products. However, the conventional isolated samples contained virtually no Fe(II) (Table 2).…”

Section: Resultsmentioning

confidence: 99%

Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

Marić

Dražić

Štefanić

et al. 2020

Materials Characterization

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“…However, the studies are mostly oriented toward the synthesis of metal NPs and gels containing metal NPs. The radiolytic synthesis of iron oxide nanoparticles and nanocomposite gels is rarely studied [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. One of the reasons for this is a very complex iron oxide chemistry, which generates numerous iron oxide and oxyhydroxide polymorphs.…”

Section: Introductionmentioning

confidence: 99%

Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method

et al. 2020

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Magnetic polymer gels are a new promising class of nanocomposite gels. In this work, magnetic PEO/iron oxide nanocomposite hydrogels were synthesized using the one-step -irradiation method starting from poly(ethylene oxide) (PEO) and iron(III) precursor alkaline aqueous suspensions followed by simultaneous crosslinking of PEO chains and reduction of Fe(III) precursor. -irradiation dose and concentrations of Fe3+, 2-propanol and PEO in the initial suspensions were varied and optimized. With 2-propanol and at high doses magnetic gels with embedded magnetite nanoparticles were obtained, as confirmed by XRD, SEM and Mössbauer spectrometry. The quantitative determination of -irradiation generated Fe2+ was performed using the 1,10-phenanthroline method. The maximal Fe2+ molar fraction of 0.55 was achieved at 300 kGy, pH = 12 and initial 5% of Fe3+. The DSC and rheological measurements confirmed the formation of a well-structured network. The thermal and rheological properties of gels depended on the dose, PEO concentration and initial Fe3+ content (amount of nanoparticles synthesized inside gels). More amorphous and stronger gels were formed at higher dose and higher nanoparticle content. The properties of synthesized gels were determined by the presence of magnetic iron oxide nanoparticles, which acted as reinforcing agents and additional crosslinkers of PEO chains thus facilitating the one-step gel formation.

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Investigation of solid phase upon γ-irradiation of ferrihydrite-ethanol suspension

Cited by 11 publications

References 18 publications

Radiolytic synthesis of manganese oxides and their ability to decolorize methylene blue in aqueous solutions

Radiolytic synthesis of manganese oxides and their ability to decolorize methylene blue in aqueous solutions

Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method

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