Impact of inorganic buffering ions on the stability of Fe(VI) in aqueous solution: role of the carbonate ion

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33159800" target="_blank" >RIV/61989592:15310/16:33159800 - isvavai.cz</a>

Result on the web

<a href="http://pubs.rsc.org/en/content/articlepdf/2016/cp/c5cp07543b" target="_blank" >http://pubs.rsc.org/en/content/articlepdf/2016/cp/c5cp07543b</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c5cp07543b" target="_blank" >10.1039/c5cp07543b</a>

Result language

angličtina

Original language name

Impact of inorganic buffering ions on the stability of Fe(VI) in aqueous solution: role of the carbonate ion

Original language description

An iron compound of +6 oxidation state ((FeO42-)-O-VI, Fe(VI)) is a green molecule for various applications (water oxidation catalyst, organic transformation for synthesis, and water remediation agent). However, its use is hindered because of its inherent decay in aqueous solution. This study presents a systematic kinetics investigation of the decay of ferrate(VI) in the presence of inorganic buffering ions (borate, phosphate, and carbonate) at a pH range from 6.0 to 9.0. When the heterogeneous decay of Fe(VI) on ferric products was inhibited by phosphate, detailed kinetic analysis revealed that the carbonate anion enhanced the Fe(VI) decay rate, compared to phosphate and borate ions. The order of the Fe(VI) decay rate under neutral solution conditions was carbonate > phosphate }= borate. In alkaline solution, the decay rates of Fe(VI) were similar for the studied buffering ions. The decay of Fe(VI) in the presence of the carbonate ion was described by mixed first- and second-order kinetics and the first-order rate constant (k(1)') had a linear relationship with the concentration of the carbonate ion at a neutral pH (k(1)' = 0.023 + 3.54 x [carbonate] L mol(-1) s(-1)). The analysis of the Fe(VI) decay intermediates/products (O-center dot(2)-, H2O2, and O-2) suggests similar decay pathways in the presence of different buffering anions. The impact of carbonate ions on the size of the nanoparticles of the Fe(III) precipitate, the final reduced form of Fe(VI), was studied using transmission electron microscopy, Fe-57 Mossbauer spectroscopy, and magnetization measurements. The results indicated that carbonate ions induce the formation of ultrasmall iron(III) oxyhydroxide nanoparticles (<5 nm), which apparently contribute to increased decay of Fe(VI) due to their larger specific surface area.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CA - Inorganic chemistry

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

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Volume of the periodical

18

Issue of the periodical within the volume

6

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

4415-4422

UT code for WoS article

000369509100018

EID of the result in the Scopus database

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