State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Chemosphere. 2020 Oct;257:127207. doi: 10.1016/j.chemosphere.2020.127207. Epub 2020 Jun 1.
Mechanochemical methods with co-milling reagents have been widely used to degrade organic pollutants. In this study, calcium oxide and persulfate were employed as co-milling reagents in a mechanochemical process that showed highly effective degradation of hexachlorobenzene in contaminated soil. The influences of soil particle size and organic matter content were also investigated. The interaction between different factors was analyzed by response surface methodology, and a multi-variate regression equation was obtained relating the soil-to-oxidant mass ratio, rotation speed and organic matter content. The existence of SO and OH during the mechanochemical reaction was proved by the indirect detection of benzoquinone and p-hydroxybenzoic acid for the first time, providing a new method for testing free radicals in solid-phase reactions. Finally, a possible activation mechanism and hexachlorobenzene degradation pathway were proposed. This study successfully presents a mild degradation method in the field of hexachlorobenzene contaminated site remediation.
机械化学方法与共磨试剂已被广泛用于降解有机污染物。在这项研究中，氧化钙和过硫酸盐被用作机械化学过程中的共磨试剂，显示出对污染土壤中六氯苯的高效降解。还研究了土壤粒径和有机质含量的影响。通过响应面法分析了不同因素之间的相互作用，得到了一个与土壤-氧化剂质量比、转速和有机质含量相关的多元回归方程。首次通过间接检测苯醌和对羟基苯甲酸证明了机械化学反应过程中 SO 和 OH 的存在，为固相反应中自由基的检测提供了一种新方法。最后，提出了一种可能的激活机制和六氯苯的降解途径。本研究成功地提出了一种在六氯苯污染场地修复领域的温和降解方法。
