School of Environment and Safety Engineering, Qingdao University of Science and Technology, Shandong, Qingdao 266042, China.
J Hazard Mater. 2010 Aug 15;180(1-3):247-52. doi: 10.1016/j.jhazmat.2010.04.021. Epub 2010 Apr 13.
Degradation of 2, 4-dichlorophenol (2, 4-DCP) in aqueous media by anodic oxidation using Ti-based oxide electrode has been studied. Additionally, the influence of anodic oxidation on the biodegradability of 2, 4-DCP solution was investigated. It was found that alkaline media was suitable for the anodic oxidation of 2, 4-DCP, while acidic media tended to cause more 2, 4-DCP volatizing. The poor degradation of 2, 4-DCP was ascribed to the direct anodic oxidation at lower anodic potential, while the indirect anodic oxidation was responsible for the better degradation at higher anodic potential with a high power consumption. The variation of COD and the characteristic of UV-vis spectra indicated that some organic intermediates were produced during the course of the degradation of 2, 4-DCP. The obvious inhibition of microbial activity was observed when 2, 4-DCP concentration was about 100 mg/L. The anodic oxidation process was able to enhance the biodegradability of 2, 4-DCP solution and this enhancement became greater with the extension of anodic oxidation treatment. This work suggests that the anodic oxidation with the Ti/IrO(2)/RuO(2)/TiO(2) electrode generally applied in chemical industry is a promising alternative for the pretreatment of the wastewaters containing chlorophenols.
采用钛基氧化物电极通过阳极氧化作用在水介质中降解 2,4-二氯苯酚（2,4-DCP）的研究已经完成。此外，还研究了阳极氧化对 2,4-DCP 溶液可生化性的影响。研究发现碱性介质有利于 2,4-DCP 的阳极氧化，而酸性介质则容易导致更多的 2,4-DCP 挥发。2,4-DCP 降解效果不佳归因于较低阳极电位下的直接阳极氧化，而在高阳极电位下以高能耗进行的间接阳极氧化则有助于更好的降解。COD 的变化和 UV-vis 光谱的特征表明，在 2,4-DCP 降解过程中产生了一些有机中间产物。当 2,4-DCP 浓度约为 100mg/L 时，微生物活性受到明显抑制。阳极氧化过程能够提高 2,4-DCP 溶液的可生化性，并且随着阳极氧化处理时间的延长，这种增强效果变得更加明显。这项工作表明，普遍应用于化学工业的 Ti/IrO(2)/RuO(2)/TiO(2)电极的阳极氧化是预处理含氯苯酚废水的一种很有前途的替代方法。
