Hsueh C L, Huang Y H, Wang C C, Chen C Y
Department of Chemical Engineering, National Cheng Kung University, Tainan City, 701 Taiwan.
Water Sci Technol. 2006;53(6):195-201. doi: 10.2166/wst.2006.197.
Photooxidation of azo dye Reactive Black 5 (RB5) by H202 was performed with a novel supported iron oxide in a batch reactor in the range of pH 2.5-6.0. The iron oxide was prepared through a fluidized-bed reactor (FBR) and much cheaper than the Nafion-based catalysts. Experimental results indicate that the iron oxide can significantly accelerate the degradation of RB5 under the irradiation of UVA light (wavelength = 365 nm). An advantage of the catalyst is its long-term stability, which was confirmed through using the catalyst for multiple runs in the degradation of RB5. In addition, this study focused mainly on determining the proportions of homogeneous catalysis and heterogeneous catalysis in the batch reactor. Conclusively, although heterogeneous catalysis contributes primarily to the oxidation of RB5 during pH 4.5-6.0, the homogeneous catalysis is of increasing importance below pH 4.0 because of the Fe ions leaching from the catalyst to solution.
在间歇式反应器中，使用一种新型负载型氧化铁，在pH值为2.5至6.0的范围内，通过H₂O₂对偶氮染料活性黑5（RB5）进行光氧化。该氧化铁通过流化床反应器（FBR）制备，比基于Nafion的催化剂便宜得多。实验结果表明，在UVA光（波长 = 365 nm）照射下，氧化铁能显著加速RB5的降解。该催化剂的一个优点是其长期稳定性，这通过在RB5降解中多次使用该催化剂得到了证实。此外，本研究主要集中在确定间歇式反应器中均相催化和非均相催化的比例。总之，虽然在pH值4.5至6.0期间非均相催化对RB5的氧化起主要作用，但在pH值低于4.0时，由于铁离子从催化剂中浸出到溶液中，均相催化变得越来越重要。
