通过高级氧化过程加速的微塑料老化行为的新见解,Environmental Science & Technology

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通过高级氧化过程加速的微塑料老化行为的新见解
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-03-13 , DOI: 10.1021/acs.est.9b00493
Peng Liu ₁ , Li Qian ₁ , Hanyu Wang ₁ , Xin Zhan ₁ , Kun Lu ₁ , Cheng Gu ₁ , Shixiang Gao ₁

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在环境中，微塑料要经受多次老化过程。但是，仍然缺乏有关老化对微塑料环境行为影响的信息。本研究研究了热活化的K ₂ S ₂ O ₈对聚苯乙烯和高密度聚乙烯微塑料的改性性能。和Fenton处理可增进对水生环境中长期自然衰老的了解。我们的结果表明，O / C比是羰基指数（CI）的替代参数，用于定量描述微塑料的表面变化特性。建立了O / C比或CI与变化时间的相关模型，并通过淡水样品中微塑料的自然变化进行了比较。此外，提出了改变后的微塑料的平衡吸附容量对O / C比和平均粒径的回归方程。这项研究是区分微塑料的变化特性与变化时间/吸附能力之间关系的第一项努力，这将有助于预测水生环境中风化程度和亲水性抗生素在老化的微塑料上的积累。这项研究开发出了有前途的策略，可以使用高级氧化过程来加速老化反应，这将为评估实际环境中的微塑性污染提供进一步的信息。

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New Insights into the Aging Behavior of Microplastics Accelerated by Advanced Oxidation Processes

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.

更新日期：2019-03-13

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