【摘要】 研究了甲基橙在S2O82-+UV体系中的降解情况,在pH=1,反应8 m in时,5μmol/L的甲基橙色度去除率达100%,2 h时,TOC去除率为9.5%;同时用紫外光谱、HPLC对降解过程进行了分析.结果表明,S2O82-+UV体系中起主要作用的是SO4-.,SO4-.可由S2O82-和紫外线或Ag+作用生成,具有极强的氧化能力,电极电位为E0SO4-./SO42-≥3.4V(vs SCE),它可有效破坏复杂有机物的结构,也具有一定的聚合引发作用,但其活泼性不如.OH.更多还原

【Abstract】 The degradation process of methyl-orange in S₂O₈^2-+UV system is studied with UV spectrum and HPLC analysis,respectively.When pH=1,the decolorization efficiency of 5μmol/L methyl-orange solution is up to 100% after the 8 min reaction and removal efficiency of TOC is up to 9.5% 2 h later.The results indicate that SO₄^-·plays the main role in degradation process.Under ultraviolet radiation or reacting with Ag⁺ions,S₂O₈^2- decomposes to SO₄^-·,which exhibits higher oxidation ability with electric potential E⁰ SO₄^-·/SO₄^2-≥3.4 V（vs SCE）.SO₄^-can destroy the structure of complex organics and initiate polymerization at the same time,but has lower activity than that of·OH.更多还原