聚乙烯与微塑料沉积物复合物的相互作用:表面活性剂的关键作用
Si Liu1, Jinhui Huang1, Lixiu Shi2
1College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Environmental pollution (Barking, Essex : 1987)
|August 25, 2024
概括
表面活性剂显著改变了 (Pb(II)) 在老化微塑料沉积物复合物的吸附. 阴离子表面活性剂增强Pb(II) 结合,而阴离子表面活性剂抑制它,影响重金属环境风险评估.
科学领域:
- 环境科学 环境科学
- 环境化学环境化学
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料 (MP) 和沉积物 (S) 形成复合物,影响水生环境中的污染物行为.
- 在自然环境中,MP的老化导致生物膜形成和表面功能化.
- 表面活性剂是常见的环境污染物,可以改变MP,沉积物和重金属之间的相互作用.
研究的目的:
- 研究表面活性剂对 (Pb(II)) 在微塑料沉积物 (MPs-S) 复合体上吸附的影响.
- 了解老化MP和不同类型的表面活性剂 (阳离子和阴离子) 对Pb (II) 吸附的作用.
- 阐明MPs-S系统中Pb的吸附机制和影响因素.
主要方法:
- 处女聚胺 (VPA) 和聚乙烯 (VPE) 在河流沉积物中在现场老化六个月.
- 对功能组和生物膜物种的老化MP (生物膜开发的聚胺 - BPA,生物膜开发的聚乙烯 - BPE) 的表征.
- 批量吸附实验以确定Pb(II) 吸附到沉积物,老化MPs-S复合物,以及在二甲基硫酸盐 (SDBS) 和甲基三甲基化物 (CTAB) 的存在下.
主要成果:
- 对老年国会议员的生物膜开发引入了新的含氧功能组和改变了表面特性.
- 对Pb的吸附能力顺序是:沉积物> BPA-S> VPE-S> VPA-S> BPE-S.
- SDBS促进了Pb(II) 的吸附,在更高度下增加了吸附,而CTAB则抑制了它. 吸附依赖于pH值,在pH值6时达到峰值.
- 在外源酸 (FA) 的存在下,CTAB增强了Pb(II) 的吸附.
- 吸附机制包括化学吸附,多层吸附 (物理和化学),静电相互作用和疏水相互作用.
结论:
- 表面活性剂在调节Pb(II) 吸附到MPs-S复合体中发挥着关键作用,阳离子表面活性剂促进和阴离子表面活性剂抑制结合.
- 议员的老化过程和表面活性剂的存在显著影响了Pb的环境行为和生物可用性.
- 了解这些相互作用对于评估水生生态系统中重金属与微塑料相关的生态风险至关重要.
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