Fernández L, Bustos F, Correa D, Seguel M, Suarez C, Caro C, Leyton P, Cabello-Guzmán G. A photochemical route in the synthesis and characterization of La
2Ti
2O
7 and La
2Ti
2O
7/AgO films and its evaluation in Congo red degradation and as antibacterial control to Staphylococcus aureus.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023;
30:107580-107597. [PMID:
37737945 DOI:
10.1007/s11356-023-29847-1]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 09/08/2023] [Indexed: 09/23/2023]
Abstract
In this article, we propose a simple photochemical method to synthesize pure La2Ti2O7 films and La2Ti2O7 films doped with silver at 1.0, 3.0, and 5.0 mol%. After annealing the photo-deposited films at 900 °C, XRD, SEM, and XPS analyses showed the formation of a monoclinic La2Ti2O7 phase and the presence of Ag and AgO in doped samples. Photocatalytic tests for Congo red degradation demonstrated that pure La2Ti2O7 achieved 25.4% degradation, while doped samples reached a maximum of 92.7% degradation. Moreover, increasing silver doping on La2Ti2O7 films significantly reduced the growth of Staphylococcus aureus, indicating potential antibacterial properties. The enhanced photoactivity was attributed to the formation of a type I heterojunction between La2Ti2O7 and AgO, and a degradation mechanism was proposed based on Congo red degradation.
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