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Mechanistic Investigation of Enhanced Photoreactivity of Dissolved Organic Matter after Chlorination
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-06-24 , DOI: 10.1021/acs.est.1c02704 Dong Wan 1 , Haiyue Wang 1 , Virender K Sharma 2 , Steplinpaulselvin Selvinsimpson 1 , Hongliang Dai 1 , Fan Luo 1 , Chengjun Wang 3 , Yong Chen 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-06-24 , DOI: 10.1021/acs.est.1c02704 Dong Wan 1 , Haiyue Wang 1 , Virender K Sharma 2 , Steplinpaulselvin Selvinsimpson 1 , Hongliang Dai 1 , Fan Luo 1 , Chengjun Wang 3 , Yong Chen 1
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Chlorine is commonly used in disinfection processes in wastewater treatment plants prior to discharge of the effluents into receiving waters. Effluent organic matter and humic substances constitute up to 90% of dissolved organic matter (DOM) in receiving water, which induces photogeneration of reactive species (RS) such as excited triplet state of DOM (3DOM*), singlet oxygen (1O2), and hydroxyl radical (•OH). The RS plays an important role in the attenuation of trace pollutants. However, the effect of chlorine disinfection on the photoreactivity of the DOM has remained unclear. Here, we investigated the physicochemical properties and subsequent RS variation after chlorination of DOM. Solid-state 13C cross-polarization/magic angle-spinning NMR and Fourier transform ion cyclotron resonance mass spectrometry verified that the aromaticity, electron-donating capacity (EDC), and average molecular weight of DOM decreased markedly after chlorination. It was found for the first time that the photoproduction of 3DOM*, 1O2, and •OH increased markedly after chlorination of DOM upon irradiation of simulated sunlight. The quantum yields of 3DOM*, 1O2, and •OH were positively correlated with E2/E3 (ratio of the absorbance at 254 to 365 nm) while negatively correlated with EDC before and after chlorination. These findings highlight the synergetic effect of chlorine disinfection on the photosensitization of DOM under irradiation of sunlight, which will promote the removal of trace pollutants in surface waters.
中文翻译：
氯化后溶解有机物增强光反应性的机理研究
氯通常用于废水处理厂的消毒过程中，然后再将废水排放到接收水体中。出水有机物和腐殖质占受纳水体溶解有机物 (DOM) 的 90%，可诱导活性物质 (RS) 的光生，例如 DOM 的激发三重态 ( 3 DOM*)、单线态氧 ( 1 O 2 ) 和羟基自由基 ( • OH)。RS在微量污染物的衰减中起重要作用。然而，氯消毒对 DOM 光反应性的影响仍不清楚。在这里，我们研究了 DOM 氯化后的理化性质和随后的 RS 变化。固态13C交叉极化/魔角自旋核磁共振和傅里叶变换离子回旋共振质谱证实氯化后DOM的芳香性、给电子能力（EDC）和平均分子量显着降低。首次发现在模拟阳光照射下氯化DOM后3 DOM*、1 O 2和• OH的光生成量显着增加。3 DOM*、1 O 2和•的量子产率OH与E2/E3（254～365nm处的吸光度比）呈正相关，与氯化前后的EDC呈负相关。这些发现突出了氯消毒对阳光照射下DOM光敏化的协同作用，这将促进地表水中微量污染物的去除。
更新日期：2021-07-06
中文翻译：
氯化后溶解有机物增强光反应性的机理研究
氯通常用于废水处理厂的消毒过程中，然后再将废水排放到接收水体中。出水有机物和腐殖质占受纳水体溶解有机物 (DOM) 的 90%，可诱导活性物质 (RS) 的光生，例如 DOM 的激发三重态 ( 3 DOM*)、单线态氧 ( 1 O 2 ) 和羟基自由基 ( • OH)。RS在微量污染物的衰减中起重要作用。然而，氯消毒对 DOM 光反应性的影响仍不清楚。在这里，我们研究了 DOM 氯化后的理化性质和随后的 RS 变化。固态13C交叉极化/魔角自旋核磁共振和傅里叶变换离子回旋共振质谱证实氯化后DOM的芳香性、给电子能力（EDC）和平均分子量显着降低。首次发现在模拟阳光照射下氯化DOM后3 DOM*、1 O 2和• OH的光生成量显着增加。3 DOM*、1 O 2和•的量子产率OH与E2/E3（254～365nm处的吸光度比）呈正相关，与氯化前后的EDC呈负相关。这些发现突出了氯消毒对阳光照射下DOM光敏化的协同作用，这将促进地表水中微量污染物的去除。
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