State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
Water Res. 2013 Oct 15;47(16):6234-43. doi: 10.1016/j.watres.2013.07.042. Epub 2013 Aug 6.
Degradation of a synthetic azo dye, Orange II, by electro-peroxone (E-peroxone) treatment was investigated. During the E-peroxone process, ozone generator effluent (O2 and O3 gas mixture) was continuously sparged into an electrolysis reactor, which was equipped with a carbon-polytetrafluorethylene (carbon-PTFE) cathode to electrochemically convert the sparged O2 to H2O2. The in-situ generated H2O2 then reacted with the sparged O3 to produce •OH, which can oxidize ozone-refractory organic pollutants effectively. Thus, by simply combining conventional ozonation and electrolysis processes, and using a cathode that can effectively convert O2 to H2O2, the E-peroxone process degraded Orange II much more effectively than the two processes individually. Complete decolorization and 95.7% total organic carbon (TOC) mineralization were obtained after 4 and 45 min of the E-peroxone treatment, respectively. In comparison, only 55.6 and 15.3% TOC were mineralized after 90 min of the individual ozonation and electrolysis treatments, respectively. In addition to its high efficiency, the E-peroxone process was effective over a wide range of pH (3-10) and did not produce any secondary pollutants. The E-peroxone process can thus provide an effective and environmentally-friendly alternative for wastewater treatment.
采用电过氧（E-peroxone）处理技术研究了合成偶氮染料橙 II 的降解。在 E-peroxone 过程中，臭氧发生器废气（O2 和 O3 气体混合物）连续鼓入电解反应器中，在该反应器中装有碳-聚四氟乙烯（碳-PTFE）阴极，以电化学方式将鼓入的 O2 转化为 H2O2。然后，原位生成的 H2O2 与鼓入的 O3 反应生成•OH，可有效氧化臭氧难降解的有机污染物。因此，通过简单地结合常规的臭氧氧化和电解过程，并使用能够有效将 O2 转化为 H2O2 的阴极，E-peroxone 工艺比两种单独的工艺降解橙 II 更为有效。分别经过 4 和 45 min 的 E-peroxone 处理后，橙 II 完全脱色，TOC 总有机碳（95.7%）矿化。相比之下，在单独的臭氧氧化和电解处理 90 min 后，TOC 分别仅矿化了 55.6%和 15.3%。除了高效外，E-peroxone 工艺在广泛的 pH 值（3-10）范围内有效，并且不产生任何二次污染物。因此，E-peroxone 工艺可为废水处理提供一种有效且环保的替代方法。
