Utilizing solar light and water matrix components in situ to reduce the chemical and energy demands would make treatment technologies more sustainable for micropollutant abatement in wastewater effluents. We herein propose a new strategy for micropollutant abatement through dissolved organic matter (DOM)-mediated photosensitized activation of monochloramine (NH₂Cl). Exposing the chlorinated wastewater effluent with residual NH₂Cl to solar irradiation (solar/DOM/NH₂Cl process) degrades six structurally diverse micropollutants at rate constants 1.26–34.2 times of those by the solar photolysis of the dechlorinated effluent (solar/DOM process). Notably, among the six micropollutants, the degradation rate constants of estradiol, acetaminophen, bisphenol A, and atenolol by the solar/DOM/NH₂Cl process are 1.13–4.32 times the summation of those by the solar/DOM and solar/NH₂Cl processes. The synergism in micropollutant degradation is attributed to the generation of reactive nitrogen species (RNS) and hydroxyl radicals (HO^·) from the photosensitized activation of NH₂Cl. Triplet state-excited DOM (³DOM*) dominates the activation of NH₂Cl, leading to the generation of RNS, while HO^· is produced from the interactions between RNS and other photochemically produced reactive intermediates (e.g., O₂^·– and DOM^·+/·–). The findings advance the knowledge of DOM-mediated photosensitization and offer a sustainable method for micropollutant abatement in wastewater effluents containing residual NH₂Cl.

中文翻译：

---

溶解有机物介导的一氯胺光敏活化用于废水中微污染物的去除


原位利用太阳能和水基质组件来减少化学品和能源需求，将使处理技术在废水中微污染物减排方面更具可持续性。我们在此提出了一种通过溶解有机物（DOM）介导的一氯胺（NH ₂ Cl）光敏活化来减少微污染物的新策略。将含有残留 NH ₂ Cl 的氯化废水出水暴露在太阳辐射下（太阳能/DOM/NH ₂ Cl 工艺）可降解六种结构不同的微污染物，其速率常数是 1.26-34.2 倍脱氯废水的太阳能光解（太阳能/DOM 工艺）。值得注意的是，在六种微污染物中，太阳能/DOM/NH ₂ Cl过程对雌二醇、对乙酰氨基酚、双酚A和阿替洛尔的降解速率常数是太阳能/DOM/NH ₂ Cl过程总和的1.13~4.32倍。 DOM 和太阳能/NH ₂ Cl 过程。微污染物降解的协同作用归因于 NH ₂ Cl 的光敏活化产生活性氮 (RNS) 和羟基自由基 (HO ^· )。三重态激发的 DOM ( ³ DOM*) 主导 NH ₂ Cl 的激活，导致 RNS 的生成，而 H2O ^· 则由RNS 和其他光化学产生的反应中间体（例如 O ₂ ^·– 和 DOM ^{· +/·–} ）之间的相互作用。这些发现推进了 DOM 介导的光敏化的知识，并为含有残留 NH ₂ Cl 的废水中的微污染物减排提供了一种可持续的方法。