Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Environ Res. 2024 Jul 15;253:119167. doi: 10.1016/j.envres.2024.119167. Epub 2024 May 16.
Phthalate esters (PAEs) have become one of the most concerned emerging organic pollutants in the world, due to the toxicity to human health, and hard to remove it efficiently. In this study, the degradation performance of DBP and DEHP in the soil by water bath heating activated sodium persulfate (PS) method under different factors were studied, in which the degradation rate of DBP and DEHP were improved with the increasing of temperature, PS concentration and water/soil ratio, and higher diffusion efficiency treatments methods, due to the improved mass transfer from organic phase to aqueous media. However, the degradation rate of DEHP was much lower than that of DBP, because DEHP in the soil was more difficult to contact with SO for reaction on soil surface, and the degradation rate of PAEs in soil was significantly lower than that in water. Redundancy analysis of degradation rate of DBP and DEHP in water demonstrated that the key factors that determine the degradation rate is time for DBP, and cosolvent dosage for DEHP, indicating that the solubility and diffusion rate of PAEs from soil to aqueous are predominance function. This study provides comprehensive scenes in PAEs degradation with persulfate oxidation activated by thermal in soil, reveal the difference of degradation between DBP and DEHP is structure-dependent. So that we provide fundamental understanding and theoretical operation for subsequent filed treatment of various structural emerging pollutants PAEs contaminated soil with thermal activated persulfate.
邻苯二甲酸酯（PAEs）由于其对人类健康的毒性，已成为世界上最受关注的新兴有机污染物之一，且难以有效去除。本研究采用水浴加热激活过硫酸钠（PS）法，研究了不同因素下 DB P 和 DEHP 在土壤中的降解性能，结果表明，随着温度、PS 浓度和水/土比的升高，DBP 和 DEHP 的降解速率均得到提高，这是由于有机相到水相的传质效率提高所致。然而，DEHP 的降解速率远低于 DBP，因为 DEHP 在土壤中更难与 SO 接触进行反应，而且 PAEs 在土壤中的降解速率明显低于在水中的降解速率。DBP 和 DEHP 在水中的降解速率冗余分析表明，决定 DBP 降解速率的关键因素是时间，而决定 DEHP 降解速率的关键因素是共溶剂用量，这表明 PAEs 从土壤到水相的溶解度和扩散速率是主要作用。本研究全面考察了热激活过硫酸盐氧化在土壤中对 PAEs 的降解作用，揭示了 DBP 和 DEHP 降解的差异是结构依赖性的。这为后续采用热激活过硫酸盐对各种结构的新兴污染物 PAEs 污染土壤进行现场处理提供了基础理解和理论操作。
