Laboratory of Applied Environmental Chemistry, Faculty of Science and Forestry, University of Eastern Finland, Patteristonkatu 1, FI-50190 Mikkeli, Finland.
Environ Technol. 2011 May-Jun;32(7-8):865-72. doi: 10.1080/09593330.2010.516770.
A novel process combining hydrogen peroxide (H2O2) and radiation emitted by ultraviolet light emitting diodes (UV LEDs) has been investigated. The UV LEDs were used as UV-C light sources emitting radiation in the range 257-277 nm for decomposition of the model substance phenol in water. In addition, the effect of H2O2 to phenol molar ratio and initial phenol concentration was examined. Two parameters, the decomposition efficiency of phenol and characterization of hydroxyl radical (HO*) production from H2O2 when illuminated with UV radiation, were selected to provide detailed information regarding the performance of the UV LEDs in the treatment process. A new concept was introduced to characterize and describe the production of HO* radicals produced when photons were absorbed by H2O2 molecules. The phenol decomposition efficiency at the initial concentration of 100 mg/L was the most pronounced at the lowest emitted wavelength. A significant correlation was found between the phenol decomposition efficiency and the photons absorbed by H2O2 (i.e. formation of radicals).
一种将过氧化氢（H2O2）与紫外线发光二极管（UV LEDs）发出的辐射相结合的新工艺已被研究。该 UV LEDs 被用作 UV-C 光源，发射波长为 257-277nm 的辐射，用于分解水中的模型物质苯酚。此外，还考察了 H2O2 与苯酚摩尔比以及初始苯酚浓度的影响。选择了两个参数，即苯酚的分解效率和在 UV 辐射照射下从 H2O2 产生的羟基自由基（HO*）的特性，以提供有关 UV LEDs 在处理过程中性能的详细信息。引入了一个新概念来表征和描述当光子被 H2O2 分子吸收时产生的 HO*自由基的产生。在初始浓度为 100mg/L 时，在最低发射波长下，苯酚的分解效率最为显著。发现苯酚分解效率与 H2O2 吸收的光子（即自由基的形成）之间存在显著相关性。
