Abstract:

The simultaneous removal of Cr(Ⅵ) and phenol in the wastewater is achieved by the dielectric barrier discharge non-thermal plasma. The results show that phenol and Cr(Ⅵ) can be effectively removed via non-thermal plasma. Besides, ·OH plays a major role in the oxidative degradation process of phenol, whereas the consumption of·OH is obviously beneficial to the reduction of Cr(Ⅵ). Significant synergistic effect between phenol and Cr(Ⅵ) is found by analyzing the removal efficiency of pollutants under the coexistence of phenol and Cr(Ⅵ). The results confirm that phenol can react with·OH and increased the content of reducing·H, thereby promoting the reduction of Cr(Ⅵ). Meanwhile, Cr(Ⅵ) indirectly increases the content of·OH that reacted with phenol by consuming the reducing substances, which improves the oxidative degradation of phenol.

Key words: dielectric barrier discharge, non-thermal plasma, Cr(Ⅵ), phenol

摘要：

利用介质阻挡放电低温等离子体技术实现了废水中Cr（Ⅵ）和苯酚的同步去除。研究表明，低温等离子体对苯酚和Cr（Ⅵ）有较强的去除能力。其中·OH在苯酚氧化降解过程中起主要作用，而·OH的消耗能够明显促进Cr（Ⅵ）的还原。分析了苯酚和Cr（Ⅵ）共存条件下污染物的去除效果，发现去除过程中苯酚和Cr（Ⅵ）存在协同作用：苯酚能够与·OH发生反应，增加还原性·H含量，促进Cr（Ⅵ）的还原；Cr（Ⅵ）通过消耗还原性物质，间接增加了与苯酚反应的·OH含量，促进苯酚的降解。

关键词: 介质阻挡放电, 低温等离子体, Cr (Ⅵ), 苯酚

CLC Number: 

• X703