过硫酸盐活化高级氧化新技术

A Novel Advanced Oxidation Technology Based on Activated Persulfate

过硫酸盐在热、光、过渡金属催化等条件激活下产生强氧化性的硫酸根自由基.SO4-。基于.SO4-的过硫酸盐活化"高级氧化技术"在环境污染治理领域的应用,是刚刚发展起来的崭新的研究方向,具有广阔的应用前景。本文在分析其基本原理的基础上,综述了过硫酸盐活化技术在国内外土壤地下水有机污染原位修复、难降解有机废水处理等环境污染治理方面的研究进展,并就存在问题进行了研究展望。

The thermal, photochemical or metal ions activated decomposition of persulfate anions （·SO4^-） produces a powerful oxidant known as the sulfate free radical （·SO4^- ）, which can potentially destroy organic compounds. Activated persulfate oxidation chemistry is an emerging advanced oxidation technology （AOT） for organic pollutants degradation. This paper, for the first time, provides an up-to-date overview of application of the noveltechnology in not only soil and groundwater remediation, but also wastewater treatment. S2O8^2- is a relatively new form of in situ chemical oxidation （ISCO） oxidant that has mainly been investigated at bench-scale. However, the technology has developed rapidly due to the considerable research and applied use of this oxidant at an increasing number of field sites. As for wastewater treatment, S2O8^2- is mostly used as an electron-trapping agent to suppress hole-electron recombination in the TiO2 photocatalytic system, and only a very few reports have discussed organic pollutants direct-degradation by activated persulfate oxidation. The prospects of activated persulfate oxidation technology are also discussed.