Influence of rapid heat treatment on the photocatalytic activity and stability of strontium titanates against a broad range of pollutants

Strontium titanate (STO) photocatalysts were synthesized using a modified Pechini sol–gel method. These photocatalysts were then subjected to rapid calcination at various temperatures with short exposure times. The samples were characterized using a range of techniques, including X-ray diffractometr...

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Bibliographic Details
Main Authors: Abedi Mahsa
Gyulavári Tamás
Pap Zsolt
Corporate Author: 29th International Symposium on Analytical and Environmental Problems
Format: Book part
Published: University of Szeged Szeged 2023
Series:Proceedings of the International Symposium on Analytical and Environmental Problems 29
Kulcsszavak:Környezetkémia - hőkezelés
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Online Access:http://acta.bibl.u-szeged.hu/82339
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Summary:Strontium titanate (STO) photocatalysts were synthesized using a modified Pechini sol–gel method. These photocatalysts were then subjected to rapid calcination at various temperatures with short exposure times. The samples were characterized using a range of techniques, including X-ray diffractometry, scanning electron microscopy, diffuse reflectance spectroscopy, infrared spectroscopy, nitrogen adsorption–desorption measurements, and X-ray photoelectron spectroscopy. The photocatalytic activity of the samples was evaluated by testing their ability to oxidize phenol, oxalic acid, chlorophenol, glucose, and propanol under UV light irradiation. Notably, all the prepared samples exhibited higher photocatalytic activity compared to the commercial STO reference. Increasing the calcination temperature resulted in improved crystallinity and larger primary crystallite sizes, but it also led to reduced band gaps and specific surface areas. The enhanced photocatalytic activity observed in the most efficient samples was attributed to the presence of SrCO3 on the surface of the catalyst. Importantly, the STO photocatalysts exhibited high stability, maintaining their crystalline composition even after exposure to chemicals with different functional groups. Reusability experiments showed that the photocatalytic activity increased over successive reuse cycles, for which further investigations will be carried out to identify the possible causes.
Physical Description:5-9
ISBN:978-963-306-963-9