Department of Chemistry, Tongji University, 1239 Siping Road, 200092 Shanghai, China.
Chemosphere. 2010 Jun;80(4):410-5. doi: 10.1016/j.chemosphere.2010.04.019.
A new two-step process involving the electrocatalytic (EC) pre-oxidation and the following photoelectrocatalytic synergistic (PEC) oxidation is proposed to treat the high concentration and high-chroma methyl orange dye wastewater, which cannot be degraded by photocatalytic oxidation (PC) directly. The SnO(2)/TiO(2)-NTs/Ti electrode simultaneously possessing the outstanding PC oxidation properties of TiO(2)-NTs and the excellent EC oxidation abilities of the Sb doped SnO(2) was synthesized by impregnating Sb doped SnO(2) nanoparticles into TiO(2)-NTs. In the pre-oxidation process as the first stage, the high-color dye wastewater is decolorized with electrochemical method to some extent. Then, the wastewater becomes a light transmission system. It provides a suitable condition for PC oxidation reaction in the second stage. The synergistic effects of PC and EC oxidation led to the high PEC efficiency and the complete mineralization of dye wastewater is achieved. This two-step process is fast and efficient, which is worthy to study and explore in the practical environmental treatment.
提出了一种新的两步法工艺，即电催化（EC）预氧化和随后的光电协同（PEC）氧化，用于处理高浓度、高色度的甲基橙染料废水，这些废水直接用光催化氧化（PC）无法降解。SnO2/TiO2-NTs/Ti 电极通过将 Sb 掺杂的 SnO2纳米颗粒浸渍到 TiO2-NTs 中同时具有 TiO2-NTs 的出色 PC 氧化性能和 Sb 掺杂的 SnO2的优异 EC 氧化能力。在预氧化过程中作为第一阶段，高色度的染料废水通过电化学方法在一定程度上脱色。然后，废水变成透光系统。它为第二阶段的 PC 氧化反应提供了合适的条件。PC 和 EC 氧化的协同作用导致了高 PEC 效率，并且实现了染料废水的完全矿化。该两步法快速高效，在实际环境处理中值得研究和探索。
