Degradation of Microplastics by a Thermal Fenton Reaction,ACS ES&T Engineering

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Degradation of Microplastics by a Thermal Fenton Reaction
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-11-24 , DOI: 10.1021/acsestengg.1c00323
Kunsheng Hu ₁ , Peng Zhou ₂ , Yangyang Yang ₁ , Tony Hall ₃ , Gang Nie ₄ , Yu Yao ₁ , Xiaoguang Duan ₁ , Shaobin Wang ₁

Affiliation

Microplastics (MPs) are ubiquitous in the environment and are infiltrating the food chain, causing potential risks to living beings. However, current methods of MP removal from an aqueous environment are limited by low efficiency. Advanced oxidation processes (AOPs) are emerging techniques for MP purification. Herein, a hydrothermal coupled Fenton system is developed for decomposition of ultrahigh-molecular-weight polyethylene, achieving 95.9% weight loss in 16 h and 75.6% mineralization efficiency in 12 h. The high effectiveness is attributed to the synergy of hydrothermal hydrolysis, proton-rich environment, and massive production of hydroxyl radicals. The system is also efficient to remediate different petroleum-based plastics and maintains high efficiency in practical water bodies. Characterizations revealed a two-stage degradation process: chain unfolding/stretching and oxidation, giving rise to the formation of carbonyl groups and decreased crystallinity of MPs during the hydrothermal treatment. The chain stretching stage is pivotal to the whole treatment because it remarkably facilitates subsequent chain cleavage and Fenton oxidation. This study provides a new approach to removing MPs in water bodies and new insights into MP degradation by the AOP technology.

中文翻译：

热芬顿反应降解微塑料

微塑料（MPs）在环境中无处不在，正在渗透食物链，对生物造成潜在风险。然而，目前从水环境中去除 MP 的方法受到低效率的限制。高级氧化工艺 (AOP) 是 MP 纯化的新兴技术。在此，开发了一种用于超高分子量聚乙烯定位的水热耦合 Fenton 系统，在 16 小时内实现了 95.9% 的失重和在 12 小时内实现了 75.6% 的矿化效率。高效率归因于水热水解、富含质子的环境和大量产生羟基自由基的协同作用。该系统还可以有效地修复不同的石油基塑料，并在实际水体中保持高效。表征揭示了两阶段降解过程：链展开/拉伸和氧化，导致羰基的形成和水热处理过程中 MPs 的结晶度降低。链拉伸阶段是整个处理的关键，因为它显着促进了随后的链断裂和芬顿氧化。本研究提供了一种去除水体中 MPs 的新方法，以及 AOP 技术对 MPs 降解的新见解。

更新日期：2022-01-14

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