New Insights into the Aging Behavior of Microplastics Accelerated by Advanced Oxidation Processes
New Insights into the Aging Behavior of Microplastics Accelerated by Advanced Oxidation Processes
复制标题
对高级氧化过程加速的微塑料老化行为的新见解
DOI：
10.1021/acs.est.9b00493
复制
发表时间：
2019-04-02
影响因子：
11.4
通讯作者：
Gao, Shixiang
中科院分区：
文献类型：
--
作者：
Liu, Peng;Qian, Li;Gao, Shixiang
在环境中，微塑料经历了多次老化过程；然而，关于老化对微塑料环境行为的影响的信息仍然缺乏。本研究通过热活化K2S2O8和Fenton处理对聚苯乙烯和高密度聚乙烯微塑料的变化特性进行了研究，以提高对其在水生环境中长期自然老化的认识。我们的结果表明，O/C比是定量描述微塑料表面蚀变性能的一个可替代羰基指数（CI）的参数。通过淡水微塑料的自然蚀变，建立了O/C比或CI与蚀变时间的相关模型，并进行了比较。此外，还建立了改性微塑料平衡吸附容量与O/C比和平均粒径的回归方程。本研究首次区分了微塑料的蚀变特性与蚀变时间/吸附量之间的关系，有助于预测水生环境中老化微塑料的风化程度和亲水性抗生素的积累。本研究开发了利用高级氧化工艺加速老化反应的有希望的策略，这将为评估实际环境中的微塑料污染提供进一步的信息。
In the environment, microplastics are subjected to multiple aging processes; however, information regarding the impact of aging on the environmental behavior of microplastics is still lacking. This study investigated the alteration properties of polystyrene and high-density polyethylene microplastics by heat activated K2S2O8 and Fenton treatments to improve the understanding of their long-term natural aging in aquatic environments. Our results indicated that the O/C ratio was an alternative parameter to the carbonyl index (CI) to quantitatively describe the surface alteration properties of microplastics. The correlation model of the O/C ratio or CI versus alteration time was developed and compared by natural alteration of microplastics in freshwater samples. Moreover, the regression equation of the equilibrium adsorption capacity of altered microplastics versus the O/C ratio and average size was proposed. This study is the first effort in differentiating the relationships between the alteration properties and alteration time/adsorption capacity of microplastics, which would be helpful for predicting the weathering degree and accumulation of hydrophilic antibiotics onto aged microplastics in aquatic environments. This research develops promising strategies to accelerate the aging reactions using advanced oxidation processes, which would provide further information to assess the microplastic pollution in actual environments.