一个集成的多方法方法,用于对微塑料和纳米塑料上潜在有毒元素吸附的尺寸特定评估:对环境风险的影响
Swaroop Chakraborty1, Roland Drexel2, Prathmesh Bhadane1,3
1School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, B15 2TT, UK. s.chakraborty@bham.ac.uk.
Nanoscale
|March 20, 2025
概括
微型和纳米级塑料 (MnPs) 携带有毒金属,其中具有强烈的吸附性. 较小的塑料颗粒增强金属吸收,需要尺寸特定的环境策略.
科学领域:
- 环境化学环境化学
- 纳米技术 纳米技术
- 分析化学 分析化学
背景情况:
- 微型和纳米级塑料 (MnPs) 是环境污染物.
- MnPs可以吸附和运输潜在的有毒元素 (PTE) 金属.
- 了解MnPs上的金属吸附对于风险评估至关重要.
研究的目的:
- 研究 (Cr), (As) 和 (Se) 在碳化聚烯纳米粒子 (COOH-PSNP) 上的尺寸依赖吸附.
- 为了比较不对称的流场流量分成 (AF4) 与多角度光散射 (MALS) 和ICP-MS 与散装ICP-MS 的分析能力,用于研究MnP-金属相互作用.
- 阐明控制不同大小的MnPs金属吸附的机制.
主要方法:
- 使用非对称流域流量分成法 (AF4) 与多角度光散射 (MALS) 和感应合等离子体质谱法 (ICP-MS) 相结合.
- 分析了Cr,As和Se的吸附到100nm,500nm和1000nm的COOH-PSNP上.
- 量化金属吸附量每颗粒表面积和每单位质量,考虑到颗粒大小和表面化学.
主要成果:
- (Cr) 的吸附度最高,由于化学吸附,更大的颗粒的表面积吸附率增加.
- (As) 和 (Se) 的相互作用较弱,As吸附受外部球体复合和静电排斥的影响.
- 较小的COOH-PSNP表现出更高的每单位质量吸附效率,这是由于更大的表面积/体积比率和更高的炭基群密度.
- 在所有颗粒大小中, (Se) 的吸附是可以忽略不计的.
结论:
- 与散装ICP-MS相比,AF4-MALS-ICP-MS提供了对MnP-金属吸附的优越尺寸解析的洞察力.
- MnP的大小显著影响PTE的吸附效率和机制,较小的粒子是每质量的更有效的载体.
- 这些发现强调了MnPs在PTE运输中的环境作用,并强调了需要大小特定的风险评估和补救策略的必要性.
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