Department of Environmental Engineering, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.
J Hazard Mater. 2010 Nov 15;183(1-3):888-93. doi: 10.1016/j.jhazmat.2010.07.112. Epub 2010 Aug 6.
In this study, the electro-Fenton and fluidized-bed Fenton processes under the given conditions were used to oxidize aniline. Factors such as feeding mode and concentration of the hydrogen peroxide were explored. Results showed that the feeding mode of H(2)O(2) did not significantly affect the aniline oxidation in the electro-Fenton process. However, the aniline oxidation slightly decreased with the two-step addition of H(2)O(2) in the fluidized-bed Fenton process. Presumably the decline of remaining Fe(2+) led to destitute hydrogen radicals from the Fe(2+)-catalyzed H(2)O(2). In addition, the removal efficiency of aniline was maintained at a maximum as H(2)O(2) concentration was higher than 0.04 M in the electro-Fenton process. Meanwhile, the almost exhausted H(2)O(2) would increase the amount of Fe(2+) in the solution for the electro-Fenton process. This is because the Fe(2+) is regenerated through the reduction of Fe(3+) on the cathode. The electro-Fenton process has a stronger oxidative ability with regard to the production of the oxalic acid than fluidized-bed Fenton process which was attributed to a higher consumption of H(2)O(2). Therefore, in the aspect of H(2)O(2) depletion, the mineralization efficiency of the fluidized-bed Fenton process was higher than that of the electro-Fenton process.
在本研究中，采用电芬顿和流化床芬顿工艺在给定条件下氧化苯胺。探讨了进料方式和过氧化氢浓度等因素。结果表明，H2O2 的进料方式对电芬顿工艺中苯胺的氧化没有显著影响。然而，在流化床芬顿工艺中，H2O2 的两步添加略微降低了苯胺的氧化。推测是由于 Fe(2+)-催化 H2O2 缺乏剩余的 Fe(2+)，导致氢自由基减少。此外，在电芬顿工艺中，当 H2O2 浓度高于 0.04 M 时，苯胺的去除效率保持在最大值。同时，由于阴极还原 Fe(3+)，电芬顿工艺中溶液中的 Fe(2+)会增加，这会消耗大量的 H2O2。电芬顿工艺在生成草酸方面的氧化能力比流化床芬顿工艺更强，这归因于 H2O2 的消耗更高。因此，在 H2O2 消耗方面，流化床芬顿工艺的矿化效率高于电芬顿工艺。
