Rapid Accumulation of Soil Inorganics on Plastics: Implications for Plastic Degradation and Contaminant Fate
Rapid Accumulation of Soil Inorganics on Plastics: Implications for Plastic Degradation and Contaminant Fate
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DOI：
10.1021/acs.estlett.3c00241
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
L. N. Pincus;A. Pattammattel;Denis Leshchev;Kewei Zhao;E. Stavitski;Y. Chu;S. Myneni
中科院分区：
文献类型：
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作者：
L. N. Pincus;A. Pattammattel;Denis Leshchev;Kewei Zhao;E. Stavitski;Y. Chu;S. Myneni
随着塑料在环境中降解，塑料表面的化学氧化使无机物能够吸附并形成无机涂层，这可能是通过矿物吸附和原位矿物形成的结合。老化塑料上无机涂层的存在对塑料的命运有负面影响，阻碍了我们回收风化塑料的能力，并增加了塑料吸附污染物的可能性。在陆地风化的聚乙烯上形成的无机涂层，其特征在于使用同步辐射光谱和显微镜技术跨越空间尺度，包括光学显微镜，纳米X射线荧光映射（nano-XRF），纳米X射线吸收近边结构（nano-XANES），和高能量分辨率荧光检测-XANES（HERFD-XANES）。结果表明，异质元素分布和形态，其中包括无机物常见的土壤陆地环境，包括铁的氧化物和羟基氧化物，铝硅酸盐，和碳酸盐。
: As plastics degrade in the environment, chemical oxidation of the plastic surface enables inorganics to adsorb and form inorganic coatings, likely through a combination of adsorption of minerals and in situ mineral formation. The presence of inorganic coatings on aged plastics has negative implications for plastics fate, hindering our ability to recycle weathered plastics and increasing the potential for plastics to adsorb contaminants. Inorganic coatings formed on terrestrially weathered polyethylene were characterized using synchrotron spectroscopy and microscopy techniques across spatial scales including optical microscopy, nano-X-ray-fluorescence mapping (nano-XRF), nano-X-ray absorption near edge structure (nano-XANES), and high-energy resolution fluorescence detected-XANES (HERFD-XANES). Results indicate a heterogeneous elemental distribution and speciation which includes inorganics common to soil terrestrial environments including iron oxides and oxyhydroxides, aluminosilicates, and carbonates.