摘要：

高级氧化技术（AOPs）对有机物有显著的降解能力，尤其对含有农药、染料、药物与个人护理品等难降解有机污染物废水的处理效果较好。研究者将AOPs引入有机废水的处理过程中。在AOPs降解有机污染物的研究中，常需要添加猝灭剂终止反应，以获得实验数据。探讨了不同种类猝灭剂对基于硫酸根自由基（SO₄^·-）和羟基自由基（·OH）的2种高级氧化体系的猝灭效果。用二价铁活化过硫酸盐法（Fe²⁺/PS）与Fenton法（Fe²⁺/H₂O₂）获得SO₄^·-和·OH，以罗丹明B（RhB）作为降解物，对比研究了亚硫酸钠（Na₂SO₃）、亚硝酸钠（NaNO₂）、抗坏血酸（AA）、甲醇（MeOH）、乙醇（EtOH）和叔丁醇（TBA）作为猝灭剂的猝灭效果。实验结果显示，在SO₄^·-氧化体系中，NaNO₂和AA的猝灭效果较好；而·OH氧化体系下，NaNO₂、MeOH、EtOH和TBA的猝灭效果更佳。

关键词: 罗丹明B, 硫酸根自由基, 羟基自由基, 猝灭剂

Abstract:

Advanced oxidation process(AOPs) has significant degradation ability for organic pollutants, especially for refractory organic pollutant wastewater containing pesticides, dyes, pharmaceutical and personal care products. The researchers used AOPs for the treatment of organic wastewater. In the study of organic pollutants degradation by AOPs, it is often necessary to add quenching agent to terminate the reaction in order to obtain experimental data. The quenching effects of different quenchers on two kinds of advanced oxidation systems which based on SO₄^·- and ·OH were explored. SO₄^·- and ·OH were generated via the activation of persulfate by Fe²⁺(Fe²⁺/PS) and the Fenton process (Fe²⁺/H₂O₂) respectively. Then with Rhodamine B as the degraded target compound, the quenching effect of six quenching agents including sodium sulfite(Na₂SO₃), sodium nitrite(NaNO₂), ascorbic acid(AA), methanol(MeOH), ethanol(EtOH) and tert-butyl alcohol(TBA) were compared. The experimental results showed that NaNO₂ and AA had better quenching effect in the SO₄^·- oxidation system, while in the ·OH oxidation system, the quenching effect of NaNO₂, MeOH, EtOH and TBA was favorable.

Key words: Rhodamine B, sulfate radical, hydroxyl radical, quencher

中图分类号: 

• X703