Phase transformation-induced intimate Ag deposition in Ag-TiO2 hybrids for enhanced photocatalytic antibacterial performance

Auteurs

Nhu Nang Vu, Université du Québec à Trois-Rivières
Bich Van Tran, Université du Québec à Trois-Rivières
Safa Ladhari, Université du Québec à Trois-Rivières
Alireza Saidi, IRSST
Amine Aymen Assadi, Al-Imam Muhammad Ibn Saud Islamic University
Phuong Nguyen-Tri, Université du Québec à Trois-Rivières

Type de document

Études primaires

Année de publication

2025

Langue

Anglais

Titre de la revue

Chemical Engineering Journal

Résumé

The current work presents a novel approach for synthesizing antibacterial Ag-TiO₂ hybrid nanoparticles (NPs) by leveraging the phase transformation of dual-phase TiO₂ NPs derived from peroxo-titanium complex to promote the Ag photodeposition. The UV-driven Ag deposition initiates transformation from anatase to rutile in the lattice of TiO₂ NPs, enhancing their crystallinity while enabling intimate deposition of AgNPs on the TiO₂ surface through chemically bonded interfaces. The inherent rutile phase and doped Ag species resulting from the Ag deposition promote the phase transformation as nucleation sites, while the Ag concentration also plays a crucial role in regulating the transformation process. The synergy of phase transformation and intimate Ag deposition results in an advanced hybrid structure with enhanced visible-light absorption and efficient charge separation and transfer, which are superior to those of hybrid NPs prepared from commercial TiO₂ NPs. Consequently, the prepared hybrid NPs with an Ag concentration of 6 % induce a potent photocatalytic antibacterial activity against Escherichia coli under low-power LED light, primarily through the photocatalytic ^●OH generation with a minor contribution of Ag⁺ ion release. Escherichia coli is completely inactivated, with severe cellular destruction, after 75 min of light irradiation. This study offers an innovative approach for designing efficient hybrid NPs with great promise for antibacterial applications against biological hazards. (Elsevier)

Mots-clés

Dioxyde de titane, Titanium dioxide, CAS 13463677, Argent, Silver, CAS 7440224, Nanoparticule, Nanoparticle, Nanomatériaux, Nanomaterials, Catalyse, Catalysis, Rayonnement visible, Visible radiation, Escherichia coli, CAS 68583222, Staphylocoque, Staphylococcus, Substance photodynamique, Photodynamic substance

Numéro de projet IRSST

n/a

Citation recommandée

Vu, Nhu-Nang, Van Tran, B., Ladhari, S., Saidi, A., Assadi, A. A. et Nguyen-Tri, P. (2025). Phase transformation-induced intimate Ag deposition in Ag-TiO₂ hybrids for enhanced photocatalytic antibacterial performance. https://doi.org/10.1016/j.cej.2025.169720