High removal of PS and PET microplastics from tap water by using Fe2O3 porous microparticles and photothermal irradiation with NIR light

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Chemosphere Pub Date : 2024-11-01 DOI:10.1016/j.chemosphere.2024.143538
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Abstract

This work reports the synthesis of Fe2O3 (FeO) microparticles using the Pechini method and their use to remove microplastics from tap water. The analysis by electronic microscopy revealed that the FeO microparticles (FeMicroPs) have a porous structure and are formed by interconnected grains with sizes of 80–120 nm. In addition, the X-ray diffraction analysis pointed out that the FeMicroPs are composed of γ- Fe2O3 and α- Fe2O3 phases. To remove the PS and PET microplastics with sizes of 0.1–3 μm from the tap water, FeO was added to the contaminated water and the mixture of FeO + microplastics was irradiated with focused NIR light (980 nm). This provoked the melting of the microplastics on the FeO surface. Later, the FeMicroPs with adsorbed microplastics was recovered with magnets. This last procedure permitted a high removal of microplastics from the tap water, and the adsorption capacity was 1000 mg/g. In the next step, the microplastics adsorbed on the FeO were irradiated with NIR light to induce its thermal decomposition by photothermal irradiation, this in turn, produced the elimination of the microplastics from the FeO surface and allowed its reuse to remove more microplastics from the tap water. The elimination of the microplastics from the FeO surface was confirmed by the FTIR and Raman techniques, since the vibrational peaks associated with the microplastics disappeared from the FeO surface after the photothermal irradiation. Thus, the results of this investigation suggest that the photothermal irradiation with NIR light not only facilitates the removal of microplastics from the tap water, but also, it was useful to degrade the microplastics definitively without producing more contamination. This technique could be used to remove microplastics in water treatment plants.

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利用 Fe2O3 多孔微颗粒和近红外光热辐照技术高效去除自来水中的 PS 和 PET 微塑料。
本研究报告介绍了利用 Pechini 方法合成 Fe2O3(FeO)微粒并将其用于去除自来水中的微塑料。电子显微镜分析表明,氧化铁微粒(FeMicroPs)具有多孔结构,由尺寸为 80-120 纳米的晶粒相互连接而成。此外,X 射线衍射分析表明,FeMicroPs 由 γ- Fe2O3 和 α- Fe2O3 两相组成。为了去除自来水中尺寸为 0.1-3 μm 的 PS 和 PET 微塑料,在受污染的水中加入了 FeO,并用聚焦近红外光(980 nm)照射 FeO+ 微塑料的混合物。这促使氧化铁表面的微塑料融化。随后,用磁铁回收吸附了微塑料的 FeMicroPs。最后一道工序可以大量去除自来水中的微塑料,吸附容量为 1000 毫克/克。下一步,用近红外光照射吸附在氧化铁上的微塑料,通过光热辐照诱导其热分解,进而消除氧化铁表面的微塑料,使其能够重新用于去除自来水中的更多微塑料。傅立叶变换红外光谱和拉曼技术证实了微塑料从氧化铁表面消除的事实,因为在光热辐照后,与微塑料相关的振动峰从氧化铁表面消失了。因此,这项研究结果表明,用近红外光进行光热辐照不仅有助于去除自来水中的微塑料,而且还能在不产生更多污染的情况下彻底降解微塑料。这项技术可用于去除水处理厂中的微塑料。
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来源期刊
Chemosphere
Chemosphere 环境科学-环境科学
CiteScore
15.80
自引率
8.00%
发文量
4975
审稿时长
3.4 months
期刊介绍: Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.
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