Insight into the Photodegradation of Microplastics Boosted by Iron (Hydr)oxides,Environmental Science & Technology

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Insight into the Photodegradation of Microplastics Boosted by Iron (Hydr)oxides
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-12-06 , DOI: 10.1021/acs.est.2c07824
Ling Ding ₁ , Xuetao Guo _{1,

2} , Shengwen Du ₁ , Fengyi Cui ₁ , Yaping Zhang ₃ , Peng Liu _{1,

2} , Zhuozhi Ouyang _{1,

2} , Hanzhong Jia _{1,

2} , Lingyan Zhu _{1,

2}

Affiliation

Iron (hydr)oxides as a kind of natural mineral actively participate in the transformation of organic pollutants, but there is a large knowledge gap in their impacts on photochemical processes of microplastics (MPs). This study is the first to examine the degradation of two ordinary plastic materials, polyethylene (PE) and polypropylene (PP), mediated by iron (hydr)oxides (goethite and hematite) under simulated solar light irradiation. Both iron (hydr)oxides significantly promoted the degradation of MPs (particularly PP) with a greater effect by goethite than hematite, related to hydroxyl radical (^•OH) produced by iron (hydr)oxides. Under light irradiation, the surface Fe(II) phase catalyzed the production of H₂O₂ and promoted the release of Fe²⁺, leading to the subsequent light-driven Fenton reaction which produced a large amount of ^•OH. As the iron (hydr)oxides were modified with NaF at various concentrations, the activity of the surface Fe(II) as well as the release of Fe²⁺ were greatly reduced, and thus the ^•OH formation and MP degradation were depressed remarkably. It is worth noting that the surface hydroxyl groups (especially ≡FeOH) affected the reaction kinetics of ^•OH by regulating the activity of Fe species. These findings unveil the distinct impacts and intrinsic mechanisms of iron (hydr)oxides in influencing the photodegradation of MPs.

中文翻译：

洞察铁（氢）氧化物促进微塑料的光降解

氧化铁作为一种天然矿物，积极参与有机污染物的转化，但在其对微塑料 (MPs) 光化学过程的影响方面存在很大的知识空白。这项研究首次研究了两种普通塑料材料聚乙烯 (PE) 和聚丙烯 (PP) 在模拟太阳光照射下由氧化铁（针铁矿和赤铁矿）介导的降解情况。两种铁（氢）氧化物都显着促进了 MP（特别是 PP）的降解，针铁矿比赤铁矿的作用更大，这与铁（氢）氧化物产生的羟基自由基 ( ^• OH) 有关。光照射下，表面Fe(II)相催化H ₂ O ₂的产生，促进Fe ^2+的释放, 导致随后的光驱动芬顿反应产生大量^• OH。当铁（氢）氧化物用不同浓度的 NaF 改性时，表面 Fe(II) 的活性和 Fe ²⁺的释放大大降低，从而显着抑制了^• OH 的形成和 MP 的降解。值得注意的是，表面羟基（尤其是≡FeOH）通过调节Fe物种的活性影响^{• OH的反应动力学。}这些发现揭示了铁（氢）氧化物在影响 MP 光降解方面的独特影响和内在机制。

更新日期：2022-12-06

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