Marcela Frias Ordonez, Carolina Peverelli, E. Falletta, C. Bianchi
{"title":"Highly Efficient Silver Modified Srtio3 Photocatalyst: Synergistic Effect of Ag Doping and Ag Decoration","authors":"Marcela Frias Ordonez, Carolina Peverelli, E. Falletta, C. Bianchi","doi":"10.11159/rtese23.102","DOIUrl":null,"url":null,"abstract":"Extended Abstract Nitrogen oxides (NO and NO2) are primary pollutants directly linked to respiratory diseases and environmental disasters such as acid rain and photochemical smog [1]. As a result, multiple techniques are used for their abatement. Among them, photocatalysis offers a cost-effective, green, and sustainable technology for air purification. This technology works at ambient condition, exploits the natural or artificial light, and uses semiconductors as photocatalysts to carry out the decomposition of inorganic pollutants on the surface of the material [2]. Over the last few years, perovskite-based materials have been considered as promising candidates for water splitting and water treatment applications [3]. However, their photocatalytic performance for indoor air pollution is scarcely examined. Strontium titanate (SrTiO3) is a cubic-like perovskite with a wide energy band gap (3.2 eV) similar to TiO2. Its chemical, thermal stability, and corrosion resistance make it more attractive for developing advanced thermally stable materials. Nevertheless, its light absorption is limited to the UV spectrum range [4]. For this reason, as for TiO2, proper modifications are required, including metal-doping or metaldecoration. In the former, new energy levels are created leading to energy band gap narrowing, whereas the later improves the charge carrier separation through the semiconductor interface. Both strategies impact significantly the final photocatalytic properties of the material [5]. The work aims at the rational designing of Ag-modified SrTiO3 composite for extending its photocatalytic efficiency towards the degradation of NOx under LED light by using some strategies such as doping and decoration. A preliminary study demonstrated that the 5 wt.% Ag-decorated SrTiO3 achieved nearly 77% NOx removal after 3h. Whilst, through an eco-friendly, simpler, and valuable one-pot synthesis SrTiO3 was doubly modified by Ag+-doping within the SrTiO3 lattice and by Ag nanoparticles-decoration on the SrTiO3 surface. These modifications were confirmed by the XRD technique, where a slight shift towards the higher angles and the presence of additional peaks corresponding to metallic silver could be observed. The synergistic effect between Ag doping and Ag decoration contributed to the complete photodegradation of NOx under LED light after 180 min, reaching a photocatalytic efficiency almost 4 times greater than bare SrTiO3 (26%). The stability of the best material was assessed by performing recycling tests.","PeriodicalId":308370,"journal":{"name":"International Conference of Recent Trends in Environmental Science and Engineering","volume":"07 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Conference of Recent Trends in Environmental Science and Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.11159/rtese23.102","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Extended Abstract Nitrogen oxides (NO and NO2) are primary pollutants directly linked to respiratory diseases and environmental disasters such as acid rain and photochemical smog [1]. As a result, multiple techniques are used for their abatement. Among them, photocatalysis offers a cost-effective, green, and sustainable technology for air purification. This technology works at ambient condition, exploits the natural or artificial light, and uses semiconductors as photocatalysts to carry out the decomposition of inorganic pollutants on the surface of the material [2]. Over the last few years, perovskite-based materials have been considered as promising candidates for water splitting and water treatment applications [3]. However, their photocatalytic performance for indoor air pollution is scarcely examined. Strontium titanate (SrTiO3) is a cubic-like perovskite with a wide energy band gap (3.2 eV) similar to TiO2. Its chemical, thermal stability, and corrosion resistance make it more attractive for developing advanced thermally stable materials. Nevertheless, its light absorption is limited to the UV spectrum range [4]. For this reason, as for TiO2, proper modifications are required, including metal-doping or metaldecoration. In the former, new energy levels are created leading to energy band gap narrowing, whereas the later improves the charge carrier separation through the semiconductor interface. Both strategies impact significantly the final photocatalytic properties of the material [5]. The work aims at the rational designing of Ag-modified SrTiO3 composite for extending its photocatalytic efficiency towards the degradation of NOx under LED light by using some strategies such as doping and decoration. A preliminary study demonstrated that the 5 wt.% Ag-decorated SrTiO3 achieved nearly 77% NOx removal after 3h. Whilst, through an eco-friendly, simpler, and valuable one-pot synthesis SrTiO3 was doubly modified by Ag+-doping within the SrTiO3 lattice and by Ag nanoparticles-decoration on the SrTiO3 surface. These modifications were confirmed by the XRD technique, where a slight shift towards the higher angles and the presence of additional peaks corresponding to metallic silver could be observed. The synergistic effect between Ag doping and Ag decoration contributed to the complete photodegradation of NOx under LED light after 180 min, reaching a photocatalytic efficiency almost 4 times greater than bare SrTiO3 (26%). The stability of the best material was assessed by performing recycling tests.