Journal
CHEMICAL ENGINEERING JOURNAL
Volume 464, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.142710
Keywords
LaCoO3; Cerium and aluminum doping; Oxygen vacancy; Density functional theory; Antibacterial activity
Categories
Ask authors/readers for more resources
The doping of Ce and Al can induce the formation of oxygen vacancies in LaCoO3 and enhance the adsorption ability of oxygen and water molecules. This doping also leads to the generation of abundant oxygen vacancies and Ce4+/Ce3+ species, fast electron transport, as well as a reduced band gap. The Ce and Al codoped LaCoO3 exhibits excellent photocatalytic antibacterial activity, with a 98.8% elimination rate of Escherichia coli compared to only 46.8% for undoped LaCoO3.
Perovskite-type lanthanum cobaltate (LaCoO3) has been attracting extensive attention in photocatalysis; yet the performance is generally limited by the low structural defects and poor oxygen migration. Herein, results from first principles calculations show that Al and Ce codoping at the A and B sites of LaCoO3 can induce the formation of oxygen vacancies, which, along with the exposed Co (012) facets, facilitate the adsorption of oxygen and water molecules, a critical step in the photocatalytic production of reactive oxygen species that are known as potent antimicrobial agents. Motivated by these theoretical insights, Ce and Al codoped LaCoO3 is prepared experimentally via a simple sol-gel procedure. Spectroscopic measurements show that the cationic doping leads to the generation of abundant oxygen vacancies and Ce4+/Ce3+ species, fast electron transport, as well as a reduced band gap, as compared to the undoped counterpart. These unique structural characteristics enhance the separation and transport of photogenerated carriers and hence the generation of reactive oxygen species. Indeed, the obtained La0.9Ce0.1Co0.9Al0.1O(3) exhibits excellent photocatalytic antibacterial activity, where 98.8% of Escherichia coli is eliminated with La0.9Ce0.1Co0.9Al0.1O3 at 1 mg mL(-1) under visible photoirradiation for 30 min, in comparison to only 46.8% with undoped LaCoO3. These results underline the significance of structural engineering in enhancing the photocatalytic activity of perovskite materials for antibacterial applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available