Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
Environ Sci Technol. 2012 Jul 17;46(14):7741-5. doi: 10.1021/es300987s. Epub 2012 Jun 26.
Photocatalytic technologies were utilized to develop an environment-friendly system that is capable of removing and oxidizing organic pollutants from an air stream. A series of long-afterglow phosphors emitting long lifetime fluorescence was adapted to prepared TiO(2)-based composite photocatalysts for the photodegradation of gas-phase acetaldehyde. Although the photocatalytic reaction by an undoped titania (Degussa P25) was stopped immediately after turning off the irradiation light, the long-afterglow phosphor/nitorogen-doped TiO(2) (TiO(2-x)N(y)) composites maintained the acetaldehyde photodegradation ability even after turning off the light for a long time. This novel photocatalytic property may be attributed to the presence of the long-afterglow phosphor, which can reserve the light energy and generate the persistent fluorescence afterward as the light source for the photocatalytic reaction with the visible-light responsive TiO(2-x)N(y). The substitution of the undoped TiO(2) with TiO(2-x)N(y) was essential to use the fluorescence as a light source for photocatalysis. Such a self-fluorescence-assisted system could enhance the performance of photocatalysts for environmental cleanup.
光催化技术被用于开发一种环保系统，该系统能够从气流中去除和氧化有机污染物。一系列具有长余辉荧光的长余辉荧光粉被用于制备基于 TiO(2)的复合光催化剂，以用于气相乙醛的光降解。尽管未掺杂的二氧化钛（Degussa P25）的光催化反应在关闭照射光后立即停止，但长余辉荧光粉/氮掺杂 TiO(2)（TiO(2-x)N(y)）复合材料在关闭光后很长时间仍保持乙醛光降解能力。这种新的光催化性能可能归因于长余辉荧光粉的存在，它可以保留光能，并在随后作为光催化剂反应的可见光响应 TiO(2-x)N(y)的持久荧光光源。用 TiO(2-x)N(y)替代未掺杂的 TiO(2)对于将荧光用作光催化的光源是必不可少的。这种自荧光辅助系统可以提高用于环境清理的光催化剂的性能。
