Emerging investigator series: microplastic-based leachate formation under UV irradiation: the extent, characteristics, and mechanisms
Emerging investigator series: microplastic-based leachate formation under UV irradiation: the extent, characteristics, and mechanisms
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新兴研究者系列：紫外线照射下微塑料渗滤液的形成：程度、特征和机制
DOI：
10.1039/d2ew00423b
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Apul, Onur
中科院分区：
文献类型：
--
作者：
Collins, Ashton;Ateia, Mohamed;Bhagat, Kartik;Ohno, Tsutomu;Perreault, François;Apul, Onur
水生系统中的微塑料是塑料污染的许多不可避免的后果之一，对环境和公共健康产生了连锁反应。我们的研究旨在分析紫外线（UV）照射下的六种微塑料的表面相互作用和渗滤液的产生。渗滤液生产进行了分析，溶解有机物含量（DOC），UV 254，和荧光通过激发发射（EEM），以确定的动力学和机制参与释放的有机物的紫外线照射。结果表明，随着时间的延长，6种微塑料表面的DOC、UV 254吸光度和EEM强度都有明显的增加趋势。聚苯乙烯的DOC浓度增加最大和最快，其次是树脂涂覆的聚苯乙烯。在不同温度下进行的实验表明，这些浸出机制的吸热性质。不同聚合物的沥滤物形成的差异归因于其化学组成及其与UV相互作用的效力。通过傅里叶变换红外光谱（FT-IR）、拉曼和X射线光电子能谱（XPS）分析老化的微塑料样品，以确定浸出液形成的表面变化。结果表明，所有的微塑料都有增加的羰基指数时，老化聚苯乙烯是最大的。这些研究结果证实，渗滤液的形成是一种界面相互作用，由于微塑料的存在极其丰富及其大的表面积，可能是有机化合物流入天然沃茨的重要来源。
Microplastics in the aquatic system are among the many inevitable consequences of plastic pollution, which has cascading environmental and public health impacts. Our study aimed at analyzing surface interactions and leachate production of six microplastics under ultraviolet (UV) irradiation. Leachate production was analyzed for the dissolved organic content (DOC), UV254, and fluorescence through excitation emission (EEM) to determine the kinetics and mechanisms involved in the release of organic matter by UV irradiation. The results suggested there was a clear trend of organic matter being released from the surface of the six microplastics caused by UV irradiation based on DOC, UV254 absorbance, and EEM intensity increasing with time. Polystyrene had the greatest and fastest increase in DOC concentrations, followed by the resin coated polystyrene. Experiments conducted at different temperatures indicated the endothermic nature of these leaching mechanisms. The differences in leachate formation for different polymers were attributed to their chemical makeup and their potency to interact with UV. The aged microplastic samples were analyzed by Fourier-transform infrared spectroscopy (FT-IR), Raman, and X-ray photoelectron spectroscopy (XPS), to determine the surface changes with respect to leachate formation. Results indicated that all microplastics had increasing carbonyl indices when aged by UV with polystyrene being the greatest. These findings affirm that the leachate formation is an interfacial interaction and could be a significant source of organic compound influx to natural waters due to the extremely abundant occurrence of microplastics and their large surface areas.