Alkaline earth stannates applied in photocatalysis: prospection and review of literature

Abstract

The ABO 3 mixed oxide class known for its perovskite-like structure has aroused great scientific and technological interest in recent decades, due to its optical, magnetic and conductive properties. The objective of this work was to search the articles and patent databases for papers that relate the activity of the alkaline earth metal stannates -BaSnO 3 , CaSnO 3 and SrSnO 3 as photocatalysts for environmental application. The databases researched were the Web of Science, Scopus and Scielo for articles and USPTO, EPO and INPI for patent banks. From the exclusion criteria, 21 review articles presented different experimental parameters and conditions. Due to the excellent photocatalytic performance, the stannates presented as promising candidates in the heterogeneous photocatalysis. A description of the main papers published in literature is provided for an overview of the literature data about these materials.A classe de óxidos mistos ABO 3 conhecida por sua estrutura do tipo perovskita vêm despertando grande interesse científicotecnológico nas últimas décadas, em função de suas propriedades ópticas, magnéticas e condutoras. Este trabalho teve por objetivo buscar, nos bancos de artigos e de patentes, trabalhos que relacionem a atividade fotocatalítica dos estanatos de metais alcalinos terrosos -BaSnO 3 , CaSnO 3 e SrSnO 3 como fotocatalisadores para aplicação ambiental. Os bancos de dados pesquisados foram o Web of Science, Scopus e Scielo para os artigos e USPTO, EPO e INPI para os bancos de patentes. A partir dos critérios de exclusão, 21 artigos de revisão apresentaram parâmetros e condições experimentais distintas. Devido ao excelente desempenho fotocatalítico, os estanatos apresentam-se como candidatos promissores na fotocatálise heterogênea. Palavras-chave: estanatos, perovskita, fotocatálise. *ieda@quimica.ufpb.br

Evolution of the structure of MSnO3 (M = Ba, Sr) perovskites during hydrothermal synthesis and their photocatalytic activity

“…Furthermore, in works on photocatalysis with the participation of MSnO 3 , the transformation mechanisms were rarely analyzed, and accurate information on the spectral characteristics of radiation sources is often lacking. 8 The last two cited works in this context are more informative and can serve as a convenient example for comparison with the results of our study.…”

“…However, to date, a relatively low number of works have been devoted to the photocatalytic activity of MSnO 3 (M = Ba, Sr) as follows from a recently published review. 8 The stannates have been tested both in the processes of water decomposition (generation of hydrogen and oxygen) and in the processes of photocatalytic decomposition of dyes (potential environmental pollutants). 9–11…”

“…However, to date, a relatively low number of works have been devoted to the photocatalytic activity of MSnO 3 (M = Ba, Sr) as follows from a recently published review. 8 The stannates have been tested both in the processes of water decomposition (generation of hydrogen and oxygen) and in the processes of photocatalytic decomposition of dyes ( potential environmental pollutants). [9][10][11] The study of the photodegradation of water showed that the catalytic activity of perovskite stannates MSnO 3 increases with the decrease of the M-cation size and is maximal for CaSnO 3 .…”

“…[25][26][27][28] However, there are still signifi-cantly fewer such studies than publications on the photocatalytic properties of MSnO 3 (M = Ba, Sr) perovskites. [8][9][10][11][12][13]17,18 At the same time, we are not aware of any work that would study the photocatalytic characteristics of the products of incomplete thermolysis of MSn(OH) 6 in MSnO 3 , especially in correlation with their structural features. Therefore, the purpose of this work was to study (i) the processes of formation of the perovskite crystal structure of MSnO 3 (M = Ba, Sr) from hydrothermally obtained MSn(OH) 6 precursors, (ii) the transformation of the local environment of tin atoms during this restructuring, and (iii) the photocatalytic activity of materials at different stages of the corresponding transformations and the search for its correlation with the structural features of the phases.…”

Structural Phase Transitions and Quantum Dots Regulation of Perovskite Stannates

“…The perovskite structural ASnO 3 possess wide optical bandgaps, exhibiting a broad transparent visible photovoltaic effective range and outstanding electrical properties. − Very recently, the experimentally synthesized BaSnO 3 perovskite was found to exhibit a high carrier mobility of 320 cm 2 ·V –1 ·S –1 at room temperature, which was expected to be an excellent TCO material . In addition, the luminescent properties of ASnO 3 proved to have potential applications in environmental prevention and remediation processes. − For instance, SrSnO 3 showed high activities in photocatalytic water splitting due to the distorted SnO 6 octahedral connection and strong electron–lattice interaction, which could be designed as a promising material for developing new photocatalytic systems …”