Polypropylene Filter Coated with Modified TiO₂ Nanoparticles and β-Cyclodextrin for Microbial Deactivation under Visible Light
محورهای موضوعی : Applied Nanomaterials and smart polymersNiloofar Rafizadeh Zaeem 1 , Anahita Bahrami 2
1 -
2 - مهندسی شیمی نساجی، دانشگاه آزادد اسلامی واحد علوم و تحقیقات
کلید واژه: TiO2 Nanoparticles, β-Cyclodextrin, Polypropylene Filter, Visible Light.,
چکیده مقاله :
Air filtration systems capable of not only capturing but also inactivating airborne microorganisms are crucial for maintaining air quality. Titanium dioxide (TiO2) is a well-known photocatalyst, but its activity is largely confined to the ultraviolet (UV) spectrum. This research investigates the development of antibacterial air filters active under visible light by coating polypropylene (PP) nonwoven SSMMS filters with TiO2 nanoparticles and β-cyclodextrin (β-CD). Filters were prepared using different coating sequences (sequential and simultaneous) and characterized using Field Emission Scanning Electron Microscopy (FESEM) to analyze surface morphology and nanoparticle distribution. Photocatalytic activity under visible light (300W fluorescent lamp) was assessed via the degradation of methylene blue (MB), monitored by UV-Vis spectroscopy. Antibacterial efficacy was evaluated against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus using the AATCC 100 method. Results indicated a significant synergistic enhancement in both photocatalytic MB degradation and bacterial inactivation for filters coated with both TiO2 and β-CD compared to TiO2 alone. The coating sequence profoundly influenced performance, with the filter prepared by first coating with β-CD followed by TiO2 (Sample C) exhibiting the highest MB degradation (90% in 120 min) and the most potent antibacterial activity against both bacterial strains. These findings demonstrate that combining β-CD with TiO2 on PP filters, particularly using a sequential β-CD-first approach, yields a promising material for visible-light-driven antibacterial air filtration. The enhancement is attributed to the synergistic interaction where β-CD likely promotes reactant adsorption near the TiO2 surface, facilitating photocatalytic processes under visible light irradiation.
Air filtration systems capable of not only capturing but also inactivating airborne microorganisms are crucial for maintaining air quality. Titanium dioxide (TiO2) is a well-known photocatalyst, but its activity is largely confined to the ultraviolet (UV) spectrum. This research investigates the development of antibacterial air filters active under visible light by coating polypropylene (PP) nonwoven SSMMS filters with TiO2 nanoparticles and β-cyclodextrin (β-CD). Filters were prepared using different coating sequences (sequential and simultaneous) and characterized using Field Emission Scanning Electron Microscopy (FESEM) to analyze surface morphology and nanoparticle distribution. Photocatalytic activity under visible light (300W fluorescent lamp) was assessed via the degradation of methylene blue (MB), monitored by UV-Vis spectroscopy. Antibacterial efficacy was evaluated against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus using the AATCC 100 method. Results indicated a significant synergistic enhancement in both photocatalytic MB degradation and bacterial inactivation for filters coated with both TiO2 and β-CD compared to TiO2 alone. The coating sequence profoundly influenced performance, with the filter prepared by first coating with β-CD followed by TiO2 (Sample C) exhibiting the highest MB degradation (90% in 120 min) and the most potent antibacterial activity against both bacterial strains. These findings demonstrate that combining β-CD with TiO2 on PP filters, particularly using a sequential β-CD-first approach, yields a promising material for visible-light-driven antibacterial air filtration. The enhancement is attributed to the synergistic interaction where β-CD likely promotes reactant adsorption near the TiO2 surface, facilitating photocatalytic processes under visible light irradiation.
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Additional Placeholder Citations based on Snippets (Examples - require full literature search and APA formatting):
● Placeholder citation for review on TiO₂ photocatalysis mechanisms 1
● Placeholder citation for review on TiO₂ visible light modification strategies 1
● Placeholder citation for review on β-CD properties and complexation 11
● Placeholder citation for review on β-CD applications with nanoparticles 13
● Placeholder citation for review on photocatalytic antibacterial mechanisms/ROS 1
● Placeholder citation for comparison literature on MB degradation
● Placeholder citation for comparison literature on photocatalytic antibacterial activity
● Placeholder citation for review on air pollution and health effects
● Placeholder citation for review on air filter limitations
(End of Reference List Placeholders)
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