Ireland Christopher P, Coto Michael, Brown Lauren, Paris Russell, Ducati Caterina
Department of Materials Science and Metallurgy, University of Cambridge;
Department of Materials Science and Metallurgy, University of Cambridge.
J Vis Exp. 2018 Jun 14(136):54209. doi: 10.3791/54209.
We demonstrate a versatile protocol to be used for determining the effectiveness of photocatalysts in degrading indoor air concentration (ppb) volatile organic carbons (VOCs), illustrating this with a titanium dioxide based catalyst, and the VOC 2-propanol. The protocol takes advantage of field asymmetric ion mobility spectroscopy (FAIMS), an analysis tool that is capable of continuously identifying and monitoring the concentration of VOCs such as 2-propanol and acetone at the ppb level. The continuous nature of FAIMS allows detailed kinetic analysis, and long-term reactions, offering a significant advantage over gas chromatography, a batch process traditionally used in air purification characterization. The use of FAIMS in photocatalytic air purification has only recently been used for the first time, and with the protocol illustrated here, the flexibility in allowing alternative VOCs and photocatalysts to be tested using comparable protocols offers a unique system to elucidate photocatalytic air purification reactions at low concentrations.
我们展示了一种通用方案，用于确定光催化剂降解室内空气中挥发性有机碳（VOCs，以十亿分比计）的有效性，以二氧化钛基催化剂和VOC 2-丙醇为例进行说明。该方案利用了场不对称离子迁移谱（FAIMS），这是一种分析工具，能够连续识别和监测十亿分比水平的VOCs浓度，如2-丙醇和丙酮。FAIMS的连续特性允许进行详细的动力学分析和长期反应，与传统用于空气净化表征的分批过程气相色谱相比具有显著优势。FAIMS在光催化空气净化中的应用直到最近才首次使用，并且通过此处说明的方案，能够灵活地使用可比方案测试替代VOCs和光催化剂，从而提供了一个独特的系统来阐明低浓度下的光催化空气净化反应。
