Jo Wan-Kuen, Park Kun-Ho
Department of Environmental Engineering, Kyungpook National University, 1370 Sankeok-dong, Bukgu, Daegu 702-701, South Korea.
Chemosphere. 2004 Nov;57(7):555-65. doi: 10.1016/j.chemosphere.2004.08.018.
The current study evaluated the technical feasibility of applying TiO2 photocatalysis to the removal of low-ppb concentrations of volatile organic compounds (VOCs) commonly associated with non-occupational indoor air quality issues. A series of experiments was conducted to evaluate five parameters (relative humidity (RH), hydraulic diameter (HD), feeding type (FT) for VOCs, photocatalytic oxidation (PCO) reactor material (RM), and inlet port size (IPS) of PCO reactor) in relation to the PCO destruction efficiencies of the selected target VOCs. None of the target VOCs exhibited any significant dependence on the RH, which is inconsistent with a previous study where, under conditions of low humidity and a ppm toluene inlet level, a drop in the PCO efficiency was reported with a decreasing humidity. However, the other four parameters (HD, RM, FT, and IPS) were found to be important for better VOC removal efficiencies as regards the application of TiO2 photocatalytic technology for cleansing non-occupational indoor air. The PCO destruction of VOCs at concentrations associated with non-occupational indoor air quality issues was up to nearly 100%, and the CO generated during PCO was a negligible addition to indoor CO levels. Accordingly, a PCO reactor would appear to be an important tool in the effort to improve non-occupational indoor air quality.
本研究评估了应用二氧化钛光催化去除与非职业性室内空气质量问题相关的低 ppb 浓度挥发性有机化合物（VOCs）的技术可行性。进行了一系列实验，以评估五个参数（相对湿度（RH）、水力直径（HD）、VOCs 的进料类型（FT）、光催化氧化（PCO）反应器材料（RM）以及 PCO 反应器的入口端口尺寸（IPS））与所选目标 VOCs 的 PCO 破坏效率之间的关系。没有一种目标 VOCs 对 RH 表现出任何显著的依赖性，这与之前的一项研究不一致，在该研究中，在低湿度和 ppm 级甲苯入口水平的条件下，据报道 PCO 效率会随着湿度降低而下降。然而，就应用二氧化钛光催化技术净化非职业性室内空气而言，发现其他四个参数（HD、RM、FT 和 IPS）对于提高 VOCs 去除效率很重要。在与非职业性室内空气质量问题相关的浓度下，VOCs 的 PCO 破坏率高达近 100%，并且 PCO 过程中产生的 CO 对室内 CO 水平的增加可忽略不计。因此，PCO 反应器似乎是改善非职业性室内空气质量的一项重要工具。
