关键词: 污染场地, 过硫酸盐, 自由基, 反应动力学, 活化, 无机阴离子

Abstract:

Peroxymonosulfate (PMS) and peroxydisulfate (PDS) are widely used in environmental remediation, because they can produce oxidizing radical ·\mathrm{S}{\mathrm{O}}_{\mathrm{4}}^{\text{-}} through activation to better oxidize organic pollutants. This article compared typical activation methods of PMS and PDS, discussed possible activation mechanisms and reaction kinetics. The latest progresses on PMS and PDS activation methods were summarized. The influence of inorganic anionic (Cl^-、\mathrm{H}\mathrm{C}{\mathrm{O}}_{\mathrm{3}}^{\text{-}}\text{/}\mathrm{C}{\mathrm{O}}_{\mathrm{3}}^{\mathrm{2}\text{-}}、\mathrm{N}{\mathrm{O}}_{\mathrm{3}}^{\text{-}}、\mathrm{N}{\mathrm{O}}_{\mathrm{2}}^{\text{-}}、\mathrm{H}\mathrm{P}{\mathrm{O}}_{\mathrm{4}}^{\mathrm{2}\text{-}}、{\mathrm{H}}_{\mathrm{2}}\mathrm{P}{\mathrm{O}}_{\mathrm{4}}^{\text{-}}) on degradation reactions of organic pollutants due to competitive consumption on free radicals were also reviewed. Finally, advantages and disadvantages of various activation methods were briefly discussed, and further research areas were put forward. It is concluded that different activation methods provide a variety of options for the remediation of contaminated land. The coupling of activation methods for persulfate as an economical and high-efficiency method should be received more attentions in future. As some inorganic anions have a strong ability to scavenge free radicals, activation methods should be selected cautiously for remediation of contaminated land with high-salt contents and organics.

Key words: contaminated land, persulfate, oxidation radical, reaction kinetics, activation, inorganic anionic