Antimicrobial photodisinfection with Zn(II) phthalocyanine adsorbed on TiO2 upon UVA and red irradiation

Vanya Mantareva; Ivelina Eneva; Vesselin Kussovski; Ekaterina Borisova; Ivan Angelov

doi:10.1117/12.2084307

8 January 2015 Antimicrobial photodisinfection with Zn(II) phthalocyanine adsorbed on TiO₂ upon UVA and red irradiation

Vanya Mantareva, Ivelina Eneva, Vesselin Kussovski, Ekaterina Borisova, Ivan Angelov

Proceedings Volume 9447, 18th International School on Quantum Electronics: Laser Physics and Applications; 94470W (2015) https://doi.org/10.1117/12.2084307
Event: Eighteenth International School on Quantum Electronics: Laser Physics and Applications, 2014, Sozopol, Bulgaria

Abstract

The light exposure on a daily basis has been well accepted as a competitive method for decontamination of wastewater. The catalytic properties of TiO₂ offer a great potential to reduce the transmission of pathogens in the environment. Although the titanium dioxide shows high activity against pathogens, its general usage in water cleaning is limited due to the insufficient excitation natural light (about 3% of the solar spectrum). A hydrophobic dodecylpyridyloxy Zn(II)-phthalocyanine with four peripheral hydrocarbon chains of C12 (ZnPcDo) was immobilized on a photocatalyst TiO2 anatase (P25). The resulted greenish colored nanoparticles of phthalocyanine were characterized by the means of absorption, fluorescence and infrared spectroscopy. The laser scanning confocal fluorescence microscopy was used to visualize the phthalocyanine dye by the red fluorescence emission (650 – 740 nm). The intensive Q-band in the far red visible spectral region (~ 690 nm) suggested a monomeric state of phthalocyanine on TiO2 nanoparticles. Two pathogenic bacterial strains (methicillin-resistant Staphylococcus aureus - MRSA and Salmonella enteritidis) associated with wastewater were photoinactivated with the suspension of the particles. The effective photoinactivation was observed with 1 g.L^-1TiO₂anatase at irradiation with UVA 364 nm as with UVA 364 nm and LED 643 nm. The gram-negative Salmonella enteritidis was fully photoinactivated with ZnPcDo-TiO₂ and TiO₂ alone at UVA 346 nm and at irradiation with two light sources (364 nm + 643 nm). The proposed conjugate appears as an useful composite material for antibacterial disinfection.

Citation Download Citation

Vanya Mantareva, Ivelina Eneva, Vesselin Kussovski, Ekaterina Borisova, and Ivan Angelov "Antimicrobial photodisinfection with Zn(II) phthalocyanine adsorbed on TiO₂ upon UVA and red irradiation", Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94470W (8 January 2015); https://doi.org/10.1117/12.2084307

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