Yao Yanyan, Ochiai Tsuyoshi, Ishiguro Hitoshi, Nakano Ryuichi, Kubota Yoshinobu
Kanagawa Academy of Science and Technology, KSP Bldg. West 6F, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan.
Department of Urology, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-0004, Japan.
Appl Catal B. 2011 Aug 11;106(3):592-599. doi: 10.1016/j.apcatb.2011.06.020. Epub 2011 Jun 23.
A novel titanium dioxide-coated cordierite foam (TiO/cordierite foam) was developed for use in air cleaners. By a simple impregnation procedure, TiO nanoparticles were immobilized firmly onto the surface of a cordierite foam substrate through high-temperature (500 °C) calcination. The strong bactericidal performance of the fabricated foam was evaluated by a newly developed test method for complex three-dimensional through-pore structures. This method could trace 5-6 log units of decrease in bacterial cell numbers in an air environment, thus meeting the criteria of both the JIS and ISO standard test methods. With 0.25 mW cm of UV-A irradiation for 24 h, the bactericidal rate of the TiO/cordierite foam exceeded 99.9% for five types of airborne or droplet-based infectious pathogens: (), (), (), (), and methicillin-resistant (MRSA). The results of repeat testing, where the same sample was used three times, revealed that the bactericidal rate for was maintained at 99.9% in the second and third use, indicating that the TiO/cordierite foam possesses a long-term bactericidal action. The TiO/cordierite foam also exhibited a high photocatalytic degradation capability on gaseous acetaldehyde, which is associated with sick building syndrome, and volatile organic compounds to generate CO and HO. The results demonstrated that TiO-coated cordierite foam has great potential for use in air-cleaning filters with not only high bactericidal performance to remove pathogens in the air and in droplets, but also strong decontaminating and deodorizing functionality.
一种新型的二氧化钛涂层堇青石泡沫材料（TiO/堇青石泡沫）被开发用于空气净化器。通过简单的浸渍工艺，TiO纳米颗粒通过高温（500℃）煅烧牢固地固定在堇青石泡沫基材表面。通过一种新开发的用于复杂三维通孔结构的测试方法评估了所制备泡沫的强大杀菌性能。该方法可以追踪空气环境中细菌细胞数量减少5-6个对数单位，从而符合JIS和ISO标准测试方法的标准。在0.25 mW/cm的UV-A照射24小时的情况下，TiO/堇青石泡沫对五种空气传播或基于飞沫的传染性病原体的杀菌率超过99.9%：（）、（）、（）、（）和耐甲氧西林（MRSA）。对同一样品使用三次的重复测试结果表明，在第二次和第三次使用中，（）的杀菌率保持在99.9%，这表明TiO/堇青石泡沫具有长期杀菌作用。TiO/堇青石泡沫对与病态建筑综合症相关的气态乙醛以及挥发性有机化合物也表现出高光催化降解能力，可生成CO和HO。结果表明，TiO涂层堇青石泡沫在空气净化过滤器中具有巨大潜力，不仅具有高杀菌性能以去除空气中和飞沫中的病原体，还具有强大的去污和除臭功能。
