Degradation of the cyanotoxin microcystin-LR using iron-based photocatalysts under visible light illumination

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73583082" target="_blank" >RIV/61989592:15310/17:73583082 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s11356-017-9566-4" target="_blank" >https://link.springer.com/article/10.1007/s11356-017-9566-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11356-017-9566-4" target="_blank" >10.1007/s11356-017-9566-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Degradation of the cyanotoxin microcystin-LR using iron-based photocatalysts under visible light illumination

Popis výsledku v původním jazyce

In this study, a simple and low-cost method to synthesize iron(III) oxide nanopowders in large quantity was successfully developed for the photocatalytic degradation of microcystin-LR (MC-LR). Two visible light-active iron(III) oxide samples (MG-9 calcined at 200 A degrees C for 5 h and MG-11 calcined at 180 A degrees C for 16 h) with a particle size of 5-20 nm were prepared via thermal decomposition of ferrous oxalate dihydrate in air without any other modifications such as doping. The synthesized samples were characterized by X-ray powder diffraction, Fe-57 Mossbauer spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) specific surface area analysis, and UV-visible diffuse reflectance spectroscopy. The samples exhibited similar phase composition (a mixture of alpha-Fe2O3 and gamma-Fe2O3), particle size distribution (5-20 nm), particle morphology, and degree of agglomeration, but different specific surface areas (234 m(2) g(-1) for MG-9 and 207 m(2) g(-1) for MG-11). The results confirmed higher photocatalytic activity of the catalyst with higher specific surface area. The highest photocatalytic activity of the sample to decompose MC-LR was observed at solution pH of 3.0 and catalyst loading of 0.5 g L-1 due to large amount of MC-LR adsorption, but a little iron dissolution of 0.0065 wt% was observed. However, no iron leaching was observed at pH 5.8 even though the overall MC-LR removal was slightly lower than at pH 3.0. Thus, the pH 5.8 could be an appropriate operating condition for the catalyst to avoid problems of iron contamination by the catalyst. Moreover, magnetic behavior of gamma-Fe2O3 gives a possibility for an easy separation of the catalyst particles after their use.

Název v anglickém jazyce

Degradation of the cyanotoxin microcystin-LR using iron-based photocatalysts under visible light illumination

Popis výsledku anglicky

In this study, a simple and low-cost method to synthesize iron(III) oxide nanopowders in large quantity was successfully developed for the photocatalytic degradation of microcystin-LR (MC-LR). Two visible light-active iron(III) oxide samples (MG-9 calcined at 200 A degrees C for 5 h and MG-11 calcined at 180 A degrees C for 16 h) with a particle size of 5-20 nm were prepared via thermal decomposition of ferrous oxalate dihydrate in air without any other modifications such as doping. The synthesized samples were characterized by X-ray powder diffraction, Fe-57 Mossbauer spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) specific surface area analysis, and UV-visible diffuse reflectance spectroscopy. The samples exhibited similar phase composition (a mixture of alpha-Fe2O3 and gamma-Fe2O3), particle size distribution (5-20 nm), particle morphology, and degree of agglomeration, but different specific surface areas (234 m(2) g(-1) for MG-9 and 207 m(2) g(-1) for MG-11). The results confirmed higher photocatalytic activity of the catalyst with higher specific surface area. The highest photocatalytic activity of the sample to decompose MC-LR was observed at solution pH of 3.0 and catalyst loading of 0.5 g L-1 due to large amount of MC-LR adsorption, but a little iron dissolution of 0.0065 wt% was observed. However, no iron leaching was observed at pH 5.8 even though the overall MC-LR removal was slightly lower than at pH 3.0. Thus, the pH 5.8 could be an appropriate operating condition for the catalyst to avoid problems of iron contamination by the catalyst. Moreover, magnetic behavior of gamma-Fe2O3 gives a possibility for an easy separation of the catalyst particles after their use.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

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

2017

Kód důvěrnosti údajů

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

Název periodika

Environmental Science and Pollution Research

ISSN

0944-1344

e-ISSN

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Svazek periodika

24

Číslo periodika v rámci svazku

23

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

9

Strana od-do

19435-19443

Kód UT WoS článku

000407723100063

EID výsledku v databázi Scopus

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