A novel method for photodegradation of high-chroma dye wastewater via electrochemical pre-oxidation.
A novel method for photodegradation of high-chroma dye wastewater via electrochemical pre-oxidation.
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DOI：
10.1016/j.chemosphere.2010.04.019
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发表时间：
2010-06
期刊：
影响因子：
8.8
通讯作者：
Kunjiao Zhao;Guohua Zhao;Peiqiang Li;Junxia Gao;Baoying Lv;Dongming Li
中科院分区：
文献类型：
--
作者：
Kunjiao Zhao;Guohua Zhao;Peiqiang Li;Junxia Gao;Baoying Lv;Dongming Li
针对光催化氧化（PC）无法直接降解的高浓度、高色度甲基橙染料废水，提出了一种新的电催化（EC）预氧化和随后的光电催化协同（PEC）氧化的两步工艺。通过将Sb掺杂SnO2纳米颗粒浸渍到TiO2-NTs中，合成了SnO2/TiO2-NTs/Ti电极，该电极同时具有TiO2-NTs优异的PC氧化性能和Sb掺杂SnO2优异的EC氧化能力。在第一阶段的预氧化过程中，采用电化学方法对高色度染料废水进行一定程度的脱色。然后，废水成为光传输系统。为第二阶段PC氧化反应提供了适宜的条件。 PC和EC氧化的协同作用导致PEC效率高，实现了染料废水的完全矿化。这种两步过程快速高效，值得在实际环境治理中研究和探索。
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 SnO2/TiO2-NTs/Ti electrode simultaneously possessing the outstanding PC oxidation properties of TiO2-NTs and the excellent EC oxidation abilities of the Sb doped SnO2was synthesized by impregnating Sb doped SnO2nanoparticles into TiO2-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.