Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada N6A 5B9.
J Air Waste Manag Assoc. 2012 Sep;62(9):1032-9. doi: 10.1080/10962247.2012.695760.
Photocatalytic oxidation (PCO) is a promising technology for indoor air purification due to low operating cost, potentially long service life, and low maintenance. Ultraviolet light-emitting diode (UVLED) is a new concept in the field of PCO, which has several advantages over conventional UV light sources. Limited research has been conducted using UVLED PCO for air treatment. This study demonstrated the potential application of UVLED for the removal of volatile organic compounds (VOCs; toluene and xylene) from indoor air under different operating conditions including flow rate (25-117 cubic feet per minute [cfm]), types of catalysts (Degussa P25, sol-gel TiO2, nitrogen-doped TiO2, clay TiO2, and Bi2O3), LED intensity, and humidity in a continuous reactor. About 7-32% VOC removal occurred depending on the experimental conditions. The results show that UVLED can activate different types of photocatalysts effectively.
This study demonstrates the effectiveness of UVLED in photocatalytic oxidation applied for indoor air cleaning. Several TiO2 catalysts (Degussa P25, sol-gel TiO2, nitrogen-doped TiO2, clay TiO2, and Bi2O3) were used in the reactor to characterize the removal performance of indoor air pollutants, for example, VOCs. This is one of the very few studies that have, to date, examined toluene and xylene removal from indoor air using these catalysts with UVLED in a continuous reactor. The intent is to develop an energy-efficient continuous reaction system to remove VOCs from indoor air. The performance of the system was characterized with respect to air flow rate, humidity, types of catalysts, and light intensity.
光催化氧化（PCO）是一种很有前途的室内空气净化技术，因为它具有运行成本低、潜在使用寿命长和维护成本低等优点。紫外线发光二极管（UVLED）是 PCO 领域的一个新概念，与传统的紫外线光源相比，它具有几个优势。使用 UVLED PCO 进行空气处理的研究有限。本研究证明了 UVLED 在不同操作条件下（包括流速（25-117 立方英尺每分钟[cfm]）、催化剂类型（Degussa P25、溶胶-凝胶 TiO2、氮掺杂 TiO2、粘土 TiO2 和 Bi2O3）、LED 强度和湿度）从室内空气中去除挥发性有机化合物（VOC；甲苯和二甲苯）的潜在应用，采用连续式反应器。根据实验条件，VOC 的去除率约为 7-32%。结果表明，UVLED 可以有效地激活不同类型的光催化剂。
本研究证明了 UVLED 在用于室内空气清洁的光催化氧化中的有效性。几种 TiO2 催化剂（Degussa P25、溶胶-凝胶 TiO2、氮掺杂 TiO2、粘土 TiO2 和 Bi2O3）在反应器中被用于表征室内空气污染物（例如 VOC）的去除性能。这是迄今为止为数不多的研究之一，使用这些催化剂在连续式反应器中用 UVLED 研究了室内空气中甲苯和二甲苯的去除。目的是开发一种节能的连续反应系统，以去除室内空气中的 VOC。系统的性能是根据空气流速、湿度、催化剂类型和光强度来进行表征的。
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