(Invited) Practical Evaluation Methods of Photocatalyst from Dialogue with the Industry
Authors: Ochiai Tsuyoshi , Hamada Kengo 
Published: December 2024

Now we propose a comprehensive review of our recent contributions to the field of photocatalytic environmental purification. As a public research institute, our studies have focused on the practical evaluation of photocatalytic materials informed by the fundamental principles of photocatalysis and ongoing dialogue with industry partners.
Our first study introduced non-woven fabric-supported photocatalysts that effectively adsorb and decompose odorous and tar components in tobacco smoke1. These photocatalysts, which respond to both UV and visible light, have shown promise in improving indoor air quality. Among the tested materials, non-woven fabric-supported Fe/TiO2 demonstrated superior efficacy, suggesting its potential for practical applications in creating a comfortable indoor environment.
In another study, we explored the decomposition of gaseous styrene, a prevalent pollutant, using a combination of photocatalysts and ozone treatment2. This synergistic approach resulted in the complete decomposition of styrene, suggesting its potential for widespread use in air purifiers and odor management systems. The study provided insights into the practical application of photocatalysis and ozone oxidation technologies in air purifiers and their performance management.
Furthermore, we developed a novel screening test to assess the anti-viral performance of photocatalytic materials against SARS-CoV-23. This method provides a rapid and efficient means to evaluate the anti-viral capabilities of photocatalysts, which is particularly relevant in the context of the ongoing COVID-19 pandemic. The proposed screening test, based on the ‘acetaldehyde decomposition test’, offers a correlation between air purification efficiency and viral inactivation, providing a promising tool for rapid evaluation of photocatalytic materials.
These studies underscore our commitment to advancing the application of photocatalysts in environmental purification, bridging the gap between laboratory research and real-world applications. By establishing practical evaluation methods and engaging in productive industry dialogue, we aim to contribute significantly to the development of sustainable and effective environmental purification technologies.
References

Ochiai, T.; Aoki, D.; Saito, H.; Akutsu, Y.; Nagata, M. Analysis of Adsorption and Decomposition of Odour and Tar Components in Tobacco Smoke on Non-Woven Fabric-Supported Photocatalysts. Catalysts
2020, 10, 304. https://doi.org/10.3390/catal10030304

Hamada, K.; Ochiai, T.; Aoki, D.; Akutsu, Y.; Hirabayashi, Y. Decomposition of Gaseous Styrene Using Photocatalyst and Ozone Treatment. Catalysts
2022, 12, 316. https://doi.org/10.3390/catal12030316

Ochiai, T.; Nagai, T.; Hamada, K.; Tobe, T.; Aoki, D.; Sunada, K.; Ishiguro, H. Estimating the Anti-Viral Performance of Photocatalytic Materials: The Correlation between Air Purification Efficiency and Severe Acute Respiratory Syndrome Coronavirus 2 Inactivation. Catalysts
2024, 14, 163. https://doi.org/10.3390/catal14030163

Figure 1