电催化氧化处理三唑类杀菌剂模拟废水

Electrochemical degradation of triazole fungicides in aqueous solution

以三环唑和丙环唑为特征污染物,研究了Ti O2-NTs/Sn O2-Sb/Pb O2电极电催化氧化处理模拟废水中三唑类杀菌剂的机理。实验结果表明,电催化氧化对废水中三唑类杀菌剂的降解符合一级动力学关系,且降解速率为:丙环唑>三环唑。利用气相色谱-质谱联用仪(GC-MS)和离子色谱仪(IC)对电催化氧化降解三环唑和丙环唑溶液产生的中间产物和最终产生的有机酸和无机离子进行检测分析,推断出废水中三唑类杀菌剂电催化氧化的降解路径。通过斑马鱼实验得出电催化氧化对废水中三环唑急性毒性的削减幅度较大,对丙环唑的削减幅度较小。

Electrochemical degradation of triazole fungicides（ TFs） at Ti O2-NTs / Sn O2-Sb / Pb O2 anode was studied in aqueous solution by using tricyclazole and propiconazole as the target compounds. Results of bulk electrolysis showed that degradation of TFs were fit to a pseudo first-order equation. The two compounds were degraded with the following sequence： propiconazole tricyclazole in terms of their rates of oxidation. Intermediates and related ions formed during the degradation were determined by gas chromatography-mass spectrometry（ GC-MS）and ion chromatography（ IC）. Considering all the oxidation products,a general reaction sequence for TFs degradation was proposed. Additionally,according to the zebrafish test,the acute toxicity of tricyclazole treated solution significantly decreased,and that of propiconazole was relatively small.