双金属催化过硫酸盐降解偶氮染料

Bimetallic Catalyzed Persulfate Degradation of Azo Dyes

采用置换法制备Cu/Fe催化剂,并通过X射线衍射(XRD)对其进行表征。考察了Cu/Fe催化过硫酸钠(PS)降解金橙Ⅱ的效果及其影响因素,并对降解反应机理进行探究。结果表明,Cu/Fe能够催化PS降解金橙Ⅱ废水,并且其催化效果优于零价铁,其中当pH=3、PS的质量浓度为2.0 g/L、Cu/Fe催化剂的质量浓度为0.250g/L时,金橙Ⅱ的降解率为99%。利用叔丁醇和甲醇作为自由基捕获剂,证实了降解反应中起到氧化作用的活性自由基为SO_4~-·和·OH。

The Cu/Fe catalyst was prepared by displacement method and characterized by X⁃ray diffraction(XRD).The degradation effect of Orange II by persulfate(PS)catalyzed by Cu/Fe and its influence factors were investigated,and the mechanism of degradation was also investigated.The experimental results show that Cu/Fe can catalyze PS to degradate Orange II wastewater successfully,and its catalytic effect is better than that of zero⁃valent iron.When pH=3,the mass concentration of PS is 2.0 g/L,the quality of Cu/Fe catalyst at a concentration of 0.250 g/L,the degradation rate of Orange II is up to 99%.The t⁃butanol and methanol are used as radical scavengers to confirmed that the active radicals in the process of degradation are SO-4·and·OH.