Nogueira R F P, Trovó A G, Paterlini W C
Institute of Chemistry of Araraquara, São Paulo State University, R. Prof. Francisco Degni s/n, 14800-900, Araraquara, SP, Brazil.
Water Sci Technol. 2004;49(4):195-200.
The effect of combining the photocatalytic processes using TiO2 and the photo-Fenton reaction with Fe3+ or ferrioxalate as a source of Fe2+ was investigated in the degradation of 4-chlorophenol (4CP) and dichloroacetic acid (DCA) using solar irradiation. Multivariate analysis was used to evaluate the role of three variables: iron, H2O2 and TiO2 concentrations. The results show that TiO2 plays a minor role when compared to iron and H2O2 in the solar degradation of 4CP and DCA in the studied conditions. However, its presence can improve TOC removal when H2O2 is totally consumed. Iron and peroxide play major roles, especially when Fe(NO3)3 is used in the degradation of 4CP. No significant synergistic effect was observed by the addition of TiO2 in this process. On the other hand, synergistic effects were observed between FeOx and TiO2 and between H2O2 and TiO2 in the degradation of DCA.
研究了使用TiO₂的光催化过程与以Fe³⁺或草酸铁作为Fe²⁺源的光芬顿反应相结合，在太阳辐射下对4-氯苯酚（4CP）和二氯乙酸（DCA）进行降解的效果。采用多变量分析来评估三个变量的作用：铁、H₂O₂和TiO₂的浓度。结果表明，在所研究的条件下，在4CP和DCA的太阳降解过程中，与铁和H₂O₂相比，TiO₂的作用较小。然而，当H₂O₂完全消耗时，其存在可以提高总有机碳（TOC）的去除率。铁和过氧化物起主要作用，特别是在使用Fe(NO₃)₃降解4CP时。在此过程中，添加TiO₂未观察到明显的协同效应。另一方面，在DCA的降解过程中，观察到FeOx与TiO₂之间以及H₂O₂与TiO₂之间存在协同效应。
