在水生环境中,电子垃圾塑料衍生微塑料的金属浸出伴随着自然的光衰老行为
Jianshuai Zhang1, Shuyuan Yu2, Zhe Xu3
1Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Journal of environmental sciences (China)
|March 6, 2025
概括
回收的电子塑料含有比新塑料更高的金属含量. 老化会释放诸如Zn,Ba和Sb之类的金属,而ABS塑料由于释放的Pb,Cd,Ni和Al而造成更大的环境风险.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
背景情况:
- 电子产品使用各种金属添加剂的塑料.
- 回收过程可以使电子垃圾塑料中的这些金属添加剂不稳定.
- 从老旧的电子垃圾塑料中出有害金属会对环境造成重大危害.
研究的目的:
- 分析和比较新与回收电子垃圾塑料中的金属含量.
- 在自然光照射下研究老化过程和金属漏行为.
- 评估与不同类型的电子垃圾塑料相关的环境风险,特别是ABS.
主要方法:
- 电子垃圾塑料暴露在自然光下112天.
- 分析新塑料和回收塑料中的金属含量.
- 在老化过程中监测金属漏和颗粒大小变化.
- 使用光谱学识别释放的金属物种.
主要成果:
- 与新塑料相比,回收塑料的整体金属含量较高 (例如,回收塑料的Ti>100 mg/kg,而新塑料的Ti>100 mg/kg).
- 诸如 (Zn), (Ba) 和 (Sb) 等金属在老化过程中更容易出水.
- 由于老化,烯丁乙 (ABS) 和回收ABS的颗粒大小显著减少 (分别为40微米和85微米),释放未被检测到的金属 (Pb,Cd,Ni,Al).
结论:
- 回收的电子垃圾塑料含有更高度的金属添加剂.
- 老化过程有助于电子塑料中释放危险金属.
- 由于其老化和金属释放特性,ABS和回收ABS电子塑料表明潜在的环境风险增加.
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