MPs-DOM 在水环境中的光转化和光活性:通过光学和分子特征解读 MPs 结构的关键作用。

Saisai Guo, Linan Liu, Lan Wang, Jingchun Tang
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引用次数: 0

摘要

来自微塑料的溶解有机物(DOM)(MPs-DOM)可能是 DOM 中具有光活性的成分之一。然而,有关 MPs-DOM 在光转化过程中的性质和光活性的信息非常有限。在此,我们研究了来自聚烯烃的 MPs-DOM(MPs-DOM-POs)、来自含苯聚合物的 MPs-DOM(MPs-DOM-BCPs)和苏瓦尼河天然有机物(SR-NOM)在 168 小时光转化过程中的性质和光活性。光转化后,所有受检类型的 DOM 的浓度和分子量都有所下降。值得注意的是,MPs-DOM-POs 的芳香度和饱和度都有所提高,而 MPs-DOM-BCPs 和 SR-NOM 的芳香度和饱和度都有所降低。与 MPs-DOM-BCPs 相比,MPs-DOM-POs 的 -OH 稳态浓度更高,但 1O2 稳态浓度却低得多。相比之下,与 SR-NOM 相比,MPs-DOM 产生的 -OH 更多,但 1O2 更少。本研究首次提出,反应性中间产物(尤其是 -OH)使脂肪族 C─H 键多样化(芳基化和羰基化)是 MPs-DOM-POs 光转化的主要途径。另一方面,反应性中间产物(尤其是 1O2)对芳香族羧酸的裂解是 MPs-DOM-BCPs 和 SR-NOM 光转化的主要机制。我们的研究结果为了解 MPs-DOM 的光转化和光活性提供了新的视角,有助于理解 MPs 在水环境中的潜在风险。
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Phototransformation and photoreactivity of MPs-DOM in aqueous environment: Key role of MPs structure decoded by optical and molecular signatures.

The dissolved organic matter (DOM) derived from microplastics (MPs-DOM) can be one of the photoactive components in DOM. However, information on the properties and photoreactivity of MPs-DOM during phototransformation is limited. Here, we investigated the properties and photoreactivity of MPs-DOM from polyolefins (MPs-DOM-POs), MPs-DOM derived from benzene-containing polymers (MPs-DOM-BCPs), and Suwannee River natural organic matter (SR-NOM), during a 168-hour phototransformation. After phototransformation, all examined types of DOM exhibit a decrease in concentration and molecular weight. Notably, MPs-DOM-POs display increased aromaticity and saturation, while MPs-DOM-BCPs and SR-NOM show reduced aromaticity and saturation. MPs-DOM-POs present higher steady-state concentrations of •OH but much lower steady-state concentrations of 1O2 than those of MPs-DOM-BCPs. In comparison, MPs-DOM produce more •OH but less 1O2 than SR-NOM. This study proposes that the diversification of aliphatic C─H bonds (arylation and carbonylation) by reactive intermediates (especially •OH) is the main pathway for MPs-DOM-POs phototransformation for the first time. On the other hand, the cleavage on the aromatic carboxylic acids by reactive intermediates (especially 1O2) is the main mechanism for MPs-DOM-BCPs and SR-NOM phototransformation. Our findings provide new insights into the phototransformation and photoreactivity of MPs-DOM and help to understand the potential risks of MPs in aqueous environment.

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