冷等离子体处理Au/TiO2可见光催化剂及其脱除室内空气中甲醛的反应性能

负载于TiO2载体上的纳米Au粒子因具有表面等离子共振效应而高效吸收可见光，被视为一种极具发展前景的可见光催化剂。然而，制备高效的Au/TiO2可见光催化剂需发展一种特别有效的低温处理方法。冷等离子体具有高达10,000 K以上的电子温度和低至室温的气体温度，因此本项目基于冷等离子体这种新型独特的低温处理方法，拟开展Au/TiO2可见光催化剂的冷等离子体处理及其脱除室内空气中甲醛反应性能的研究。研究等离子体处理室电极结构、放电参数以及等离子体处理工艺条件对Au/TiO2可见光催化剂性能的影响规律，结合发射光谱、质谱和FT-IR光谱等手段对等离子体处理过程的原位诊断和在线分析，阐明载体表面与Au物种的等离子体作用机制，揭示Au/TiO2可见光催化氧化甲醛反应性能的决定因素，并由此研发高性能的Au/TiO2可见光催化剂。

Supported Au/TiO2 is a very promising visible-light (VL) photocatalyst, because it has strong visible-light absorption via surface plasmon resonance (SPR) of Au nanoparticles. However, an especially effective low-temperature treatment method for preparation of Au/TiO2 VL photocatalysts is needed. Cold plasma has electron temperatures higher than 10,000 K and gas temperature as low as room temperature. Therefore, cold plasma as a unique low-temperature treatment method of Au/TiO2 VL photocatalysts and the performance of plasma-treated samples in formaldehyde removal from indoor air are to be studied in this project. The effects of electrode configuration in plasma treatment chamber, electric discharge parameters, and processing conditions of plasma treatment will be investigated. Combining optical emission spectra diagnostics and on-line analysis of mass spectra and FT-IR spectra, the underlying mechanisms for the plasma action on the support surface and Au species and the control factors in performance of VL photocatalytic oxidation of formaldehyde on Au/TiO2 will be clarified. Thereby, high-performance Au/TiO2 VL photocatalysts will be achieved.