过渡金属离子协同紫外活化过硫酸盐

为研究不同过渡金属离子协同紫外(UV)活化过一硫酸盐(PMS)的能力,以Co~(2+)为基准进行Cu~(2+)、Mn~(2+)、Ni~(2+)、Zn~(2+)和Fe~(3+)协同紫外活化PMS的对比实验。结果显示:Cu~(2+)、Mn~(2+)、Ni~(2+)、Zn~(2+)和Fe~(3+)与单独紫外和单独PMS联合均不能有效降解目标物;与Co~(2+)/PMS/UV体系相比,Cu~(2+)、Mn~(2+)、Ni~(2+)、Zn~(2+)和Fe~(3+)协同紫外活化PMS的能力高于Co~(2+),其中Cu~(2+)、Mn~(2+)和Fe~(3+)的协同能力高于Ni~(2+)和Zn~(2+);投加叔丁醇(TBA)和乙醇(EA)的实验发现,Cu~(2+)/PMS/UV、Mn~(2+)/PMS/UV和Fe~(3+)/PMS/UV体系中的主要氧化物是硫酸根自由基(SO_4~-·)和少量的羟基自由基(HO·)。Cu~(2+)/PMS/UV、Mn~(2+)/PMS/UV和Fe~(3+)/PMS/UV体系中AO7的降解过程均符合假一级动力学。紫外可见光谱图分析结果表明,Cu~(2+)/PMS/UV、Mn~(2+)/PMS/UV和Fe~(3+)/PMS/UV体系中AO7均被有效降解。M/PMS/UV对于染料类物质具有广泛的应用范围。

Activation of peroxomonosulfate via combining transition metal ions with UV light

Based on the cobaltic ion (Co2+), the contrastive experiments on the activation of peroxomonosulfate (PMS) via combining transition metal irons like Cu2+, Mn2+, Ni2+, Zn2+ and Fe3 with UV were investigated, which was used to examine the competence of the different transition metal ions/UV processes to activate PMS. The results revealed that it was ineffective to combine Cu2+, Mn2+, Ni2+, Zn2+ and Fe3 with UV or PMS alone with the purpose of removing the target compound. However, the Co2+/PMS process was more effective for the degradation of the target compound. The competence of activating PMS in the Cu2+, Mn2+, Ni2+, Zn2+ and Fe3/UV processes was stronger than that in the Co2+/PMS/UV process. Besides, the Cu2+/UV, Mn2+/UV and Fe3/UV processes could activate more PMS than the Ni2+/UV and Zn2+/UV processes. The addition of radical scavengers, tert-butyl alcohol (TBA) and ethyl alcohol (EA), demonstrated that sulfate radicals (SO4-.) and a small amount of hydroxyl radicals (HO?) were the primary oxygen species in the Cu2+/PMS/UV, Mn2+/PMS/UV and Fe3/PMSUV processes. In these three processes, the degradation of AO7 was followed the pseudo-first-order kinetics, and the UV-vis absorption spectra of AO7 indicated that it was removed effectively. Moreover, the M/PMS/UV process has a wide range of application to degrade dyes.