Huang Yao-Hui, Huang Yi-Fong, Chang Po-Shun, Chen Chuh-Yung
Department of Chemical Engineering, National Cheng Kung University, Tainan City 701, Taiwan.
J Hazard Mater. 2008 Jun 15;154(1-3):655-62. doi: 10.1016/j.jhazmat.2007.10.077. Epub 2007 Oct 30.
This study makes a comparison between photo-Fenton and a novel electro-Fenton called Fered-Fenton to study the mineralization of 10,000 mg/L of dye-Reactive Black B (RBB) aqueous solution, which was chosen as the model dye contaminant. Results indicate that the traditional Fenton process only yields 70% mineralization. This result can be improved by using Fered-Fenton to yield 93% mineralization resulting from the action of ferrous ion regenerated on the cathode. Furthermore, photo-Fenton allows a fast and more complete destruction of dye solutions and as a result of the action of ferrous ion regenerated by UV irradiation yields more than 98% mineralization. In all treatments, the RBB is rapidly decayed to some carboxylic acid intermediates. The major intermediates found are formic acid and oxalic acid. This study finds that formic acid can be completely mineralized by photo-Fenton, but its destruction is problematic using the Fenton method. Oxalic acid is much more difficult to treat than other organic acids. It could get further mineralization with the use of the Fered-Fenton process.
本研究对光芬顿法和一种名为铁还原芬顿法的新型电芬顿法进行了比较，以研究10000mg/L的活性黑B（RBB）染料水溶液（选为模型染料污染物）的矿化情况。结果表明，传统芬顿法仅能实现70%的矿化率。使用铁还原芬顿法可将矿化率提高到93%，这是由于阴极上再生的亚铁离子起作用的结果。此外，光芬顿法能快速且更彻底地破坏染料溶液，由于紫外线照射再生的亚铁离子起作用，矿化率超过98%。在所有处理过程中，RBB迅速降解为一些羧酸中间体。发现的主要中间体是甲酸和草酸。本研究发现，光芬顿法可使甲酸完全矿化，但使用芬顿法时其降解存在问题。草酸比其他有机酸更难处理。使用铁还原芬顿法可使其进一步矿化。
