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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

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Svazek periodika

18

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

4415-4422

Kód UT WoS článku

000369509100018

EID výsledku v databázi Scopus

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