Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China.
Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China.
Chemosphere. 2024 Jun;357:141985. doi: 10.1016/j.chemosphere.2024.141985. Epub 2024 Apr 11.
Carbonate radical (CO) has been proved to be an important secondary radical in advanced oxidation processes due to various radical reactions involved HCO/CO. However, the roles and contributions of CO in organic micropollutant degradation have not been explored systematically. Here, we quantified the impact of CO on the degradation kinetics of propranolol, a representative pollutant in the UV/peroxymonosulfate (PMS) system, by constructing a steady-state radical model. Substantially, the measured values were coincident with the predictive values, and the contributions of CO on propranolol degradation were the water matrix-dependent. Propranolol degradation increased by 130% in UV/PMS system containing 10 mM HCO, and the contribution of CO was as high as 58%. Relatively high pH values are beneficial for propranolol degradation in pure water containing HCO, and the contributions of CO also enhanced, while an inverse phenomenon was shown for the effects of propranolol concentrations. Dissolved organic matter exhibited significant scavenging effects on HO, SO, and CO, substantially retarding the elimination process. The developed model successfully predicted oxidation degradation kinetics of propranolol in actual sewage, and CO contribution was up to 93%, which in indicative of the important role of CO in organic micropollutant removal via AOPs treatment.
碳酸根自由基 (CO) 由于涉及 HCO/CO 的各种自由基反应，已被证明是高级氧化过程中的一种重要的次级自由基。然而，CO 在有机微量污染物降解中的作用和贡献尚未得到系统的探索。在这里，我们通过构建稳态自由基模型，定量研究了 CO 对紫外线/过一硫酸盐 (PMS) 体系中代表性污染物普萘洛尔降解动力学的影响。大量的实验结果与预测值吻合，并且 CO 对普萘洛尔降解的贡献取决于水基质。在含有 10 mM HCO 的 UV/PMS 体系中，普萘洛尔的降解增加了 130%，CO 的贡献高达 58%。在含有 HCO 的纯水中，较高的 pH 值有利于普萘洛尔的降解，CO 的贡献也增强，而普萘洛尔浓度的影响则呈现相反的现象。溶解的有机物对 HO、SO 和 CO 表现出显著的清除作用，大大减缓了消除过程。所开发的模型成功预测了实际污水中普萘洛尔的氧化降解动力学，CO 的贡献高达 93%，这表明 CO 在通过 AOP 处理去除有机微量污染物方面起着重要作用。
