Problem statement: Since bacteria mainly causes damage on fresh vegetables and fruits during transportation to market, anti-bacterial TiO 2 photocatalyst was applied for their packaging films. However, it has been known that pure TiO 2 exhibits low photocatalytic property due to rapid recombination of photo-activated electrons and holes. Doping with metal or metal oxide shows the improvement of photocatalytic activity and disinfection effect. Approach: Fe 3+ was considered to dope into TiO 2 /3SnO 2 photocatalyst in order to enhance the photocatalytic property and bacterial inactivation efficiency. The Fe 3+ doped TiO 2 /3SnO 2 nanoparticles were prepared by sol-gel method and calcined at 400 °C for 2 h. The synthesized powders were characterized by XRD, BET and SEM. Photocatalytic activity and bacteria killing effect were determined by means of degradation of methylene blue solution and inactivation of E. coli bacteria, respectively. These tests were performed under UV and visible light irradiations. Results: Fe 3+ doping into TiO 2 /3SnO 2 has an effect on inhibition of anatase crystal growth, led to the enlargement of the composite specific surface area. Therefore, the photocatalytic activity of Fe 3+ doped TiO 2 /3SnO 2 composite in proper concentration was greater than those of pure TiO 2 and TiO 2 /3SnO 2 and 0.5 mol% Fe 3+ doping exhibited the highest photocatalytic activity and E.coli inactivation efficiency. The E. coli was completely killed within 90 min under UV irradiation or 99.7% inactivated under visible light exposure. Conclusion: Fe 3+ doped TiO 2 /3SnO 2 nanoparticles were successfully synthesized and identified as 100% anatase phase. The 0.5mol% Fe 3+ -doped TiO 2 /3SnO 2 which has particle size of 12.89 µm and specific surface area of 117.61 m 2 g −1 , exhibited the highest activity and disinfection efficiency. An attractive feature of Fe 3+ doped TiO 2 /3SnO 2 photocatalytic disinfection is its potential to be activated by visible light. Therefore, these composite TiO 2 nanoparticles can be utilized for fresh food packaging films.
The aim of the present study is to synthesize Fe3+-doped TiO2/3SnO2 powder and evaluate its antibacterial performance coated on polyvinylchloride films for fresh food packaging. Fe3+-doped TiO2/3SnO2 nanoparticles were prepared as a photocatalyst through the sol-gel method with concentrations of 0.3-1.2 mol% and a calcination temperature of 400°C. It was found that calcination temperatures strongly affect the phases and phase transformation of TiO2. According to XRD analysis, the anatase crystalline was formed at the calcination temperature of 400°C. In the present work, the photocatalytic performance was determined through methylene blue degradation. The antibacterial activity against Salmonella typhi was investigated with a vitro test, from which the mixture of conidial suspension and Fe3+-doped TiO2/3SnO2 powder was added to Nutrient agar (NA) plates under UV and visible light irradiation, respectively. It was found that Fe3+-doped TiO2/3SnO2 nanoparticles enhance photocatalytic activity and bacterial inactivation efficiency. In addition, Fe3+-doped TiO2/3SnO2 thin films can destroy the cell walls of bacteria within 240 min. Furthermore, the disinfection efficiency of TiO2/3SnO2/0.5 Fe3+ is greater under UV irradiation than it is under visible light.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.