Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts

Perovskites of the (La,Ba)(Fe,Ti)O<sub>3</sub> family were prepared, characterized, and utilized as heterogeneous photocatalysts, activated by natural sunlight, for environmental remediation of Acid Orange 7 (AO7) aqueous solutions. Catalysts were prepared by the ceramic (CM) and the com...

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Autores principales:	Ana Sofia Rodrigues, Lurdes Ciríaco, Maria José Pacheco, Annabel Fernandes, Sandra Mogo, Ana Lopes
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> photocatalysis sunlight AO7 ceramic method complex polymerization Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b857e0d551194331b2bbe1d134e6097a
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spelling	oai:doaj.org-article:b857e0d551194331b2bbe1d134e6097a2021-11-25T18:32:47ZSunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts10.3390/nano111131422079-4991https://doaj.org/article/b857e0d551194331b2bbe1d134e6097a2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3142https://doaj.org/toc/2079-4991Perovskites of the (La,Ba)(Fe,Ti)O<sub>3</sub> family were prepared, characterized, and utilized as heterogeneous photocatalysts, activated by natural sunlight, for environmental remediation of Acid Orange 7 (AO7) aqueous solutions. Catalysts were prepared by the ceramic (CM) and the complex polymerization (CP) methods and characterized by XRD, SEM, EDS, and band gap energy. It was found that catalytic properties depend on the synthesis method and annealing conditions. In the photocatalytic assays with sunlight, different AO7 initial concentrations and perovskite amounts were tested. During photocatalytic assays, AO7 and degradation products concentrations were followed by HPLC. Only photocatalysis with BaFeO<sub>3</sub>-CM and BaTiO<sub>3</sub>-CP presented AO7 removals higher than that observed for photolysis. However, photolysis leads to the formation of almost exclusively amino-naphthol and sulfanilic acid, whereas some of the perovskites utilized form less-toxic compounds as degradation products, such as carboxylic acids (CA). Partial substitution of Ba by La in BaTiO<sub>3</sub>-CM does not produce any change in the photocatalytic properties, but the replacement of Ti by Fe in the La<sub>0.1</sub>Ba<sub>0.9</sub>TiO<sub>3</sub> leads to reduced AO7 removal rate, but with the formation of CAs. The best AO7 removal (92%) was obtained with BaFeO<sub>3</sub>-CM (750 mg L<sup>−1</sup>), after 4 h of photocatalytic degradation with solar radiation.Ana Sofia RodriguesLurdes CiríacoMaria José PachecoAnnabel FernandesSandra MogoAna LopesMDPI AGarticleperovskites (La,Ba)(Fe,Ti)O<sub>3</sub>photocatalysissunlightAO7ceramic methodcomplex polymerizationChemistryQD1-999ENNanomaterials, Vol 11, Iss 3142, p 3142 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> photocatalysis sunlight AO7 ceramic method complex polymerization Chemistry QD1-999
spellingShingle	perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> photocatalysis sunlight AO7 ceramic method complex polymerization Chemistry QD1-999 Ana Sofia Rodrigues Lurdes Ciríaco Maria José Pacheco Annabel Fernandes Sandra Mogo Ana Lopes Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts
description	Perovskites of the (La,Ba)(Fe,Ti)O<sub>3</sub> family were prepared, characterized, and utilized as heterogeneous photocatalysts, activated by natural sunlight, for environmental remediation of Acid Orange 7 (AO7) aqueous solutions. Catalysts were prepared by the ceramic (CM) and the complex polymerization (CP) methods and characterized by XRD, SEM, EDS, and band gap energy. It was found that catalytic properties depend on the synthesis method and annealing conditions. In the photocatalytic assays with sunlight, different AO7 initial concentrations and perovskite amounts were tested. During photocatalytic assays, AO7 and degradation products concentrations were followed by HPLC. Only photocatalysis with BaFeO<sub>3</sub>-CM and BaTiO<sub>3</sub>-CP presented AO7 removals higher than that observed for photolysis. However, photolysis leads to the formation of almost exclusively amino-naphthol and sulfanilic acid, whereas some of the perovskites utilized form less-toxic compounds as degradation products, such as carboxylic acids (CA). Partial substitution of Ba by La in BaTiO<sub>3</sub>-CM does not produce any change in the photocatalytic properties, but the replacement of Ti by Fe in the La<sub>0.1</sub>Ba<sub>0.9</sub>TiO<sub>3</sub> leads to reduced AO7 removal rate, but with the formation of CAs. The best AO7 removal (92%) was obtained with BaFeO<sub>3</sub>-CM (750 mg L<sup>−1</sup>), after 4 h of photocatalytic degradation with solar radiation.
format	article
author	Ana Sofia Rodrigues Lurdes Ciríaco Maria José Pacheco Annabel Fernandes Sandra Mogo Ana Lopes
author_facet	Ana Sofia Rodrigues Lurdes Ciríaco Maria José Pacheco Annabel Fernandes Sandra Mogo Ana Lopes
author_sort	Ana Sofia Rodrigues
title	Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts
title_short	Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts
title_full	Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts
title_fullStr	Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts
title_full_unstemmed	Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts
title_sort	sunlight-driven ao7 degradation with perovskites (la,ba)(fe,ti)o<sub>3</sub> as heterogeneous photocatalysts
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b857e0d551194331b2bbe1d134e6097a
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Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O<sub>3</sub> as Heterogeneous Photocatalysts

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