Naslov
Quantitative determination of Fe(II) in radiolytically synthesized magnetic iron oxide nanoparticles

Autori
Marić, Ivan ; Pustak, Anđela ; Gotić, Marijan ; Jurkin, Tanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
14th Tihany Symposium on Radiation Chemistry - Program and Abstracts / - Siófok, 2019, P27-P27

Skup
14th Tihany Symposium on Radiation Chemistry

Mjesto i datum
Siófok, Mađarska, 25.05.2019. - 30.05.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
magnetite ; ferroxyhyte ; gamma-irradiation ; DEAE-dextran ; dextran sulfate ; Fe(II) determination ; synthesis ; phenantroline

Sažetak
Gamma-irradiation is a relatively new method of nanoparticle synthesis. By radiolytical procedure, it is possible to synthesize nanoparticles of controlled size, shape and phase composition. Unlike radiolytical synthesis of noble metal nanoparticles, the radiolytical (gamma-irradiation) synthesis of iron oxide nanoparticles is very rarely investigated. One of the reasons is very complex iron oxide chemistry that produced numerous iron oxide and oxyhydroxide polymorphs. In this work iron oxide nanoparticles were synthesized by gamma-irradiation of the iron(III) chloride alkaline aqueous solutions in the presence of 2-propanol and polymer. We synthesized different magnetic iron oxide nanoparticles (MNPs) (from spherical magnetite/maghemite nanoparticles at 36 kGy to feroxyhyte nanodiscs at 130 kGy) depending on the -irradiation dose, dose rate, pH and type of polymers such as amino-dextran and dextran sulfate. Polymers in radiolytical synthesis act as dispersants and stabilizers of magnetic nanoparticles in suspensions, because MNPs have a high tendency to agglomerate, as well as growth and surface modifiers. Since the ferrous ions (Fe2+) that formed upon gamma-irradiation of iron(III) precursor (in the form of Fe(OH)2 and Green Rust intermediate phases) are highly susceptible to oxidation, the final product depend not only on the gamma-irradiation parameters, but also on the process of product isolation. For instance, gamma-irradiation of Fe(III) precursor in the presence of polymer produced the white suspension characteristic of Fe(OH)2 that quickly oxidized in the contact with air upon the process of isolation. Therefore, in this work we quantitatively determined the concentration of Fe2+ produced in irradiated suspensions before and after the isolation of products. Fe2+ concentrations in irradiated suspensions were determined by spectrophotometric technique (using 1, 10-phenanthroline and ferrozine) as well as by redox titration using potassium permanganate. We compared these results with the amount of Fe(II) in isolated powder samples. For instance, at dose of ~130 kGy it was found that sample before the isolation consisted of almost 100 % of Fe(II), whereas after the isolation the same sample consisted exclusively of Fe(III).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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