在水溶液中的两种典型的紫外线衰老的微塑料上,Cr (VI) 的吸附和脱附行为
Chun Hu1, Yaodong Xiao1, Qingrong Jiang1
1School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China.
Langmuir : the ACS journal of surfaces and colloids
|December 16, 2024
概括
紫外线老化微塑料 (MPs),特别是聚胺和聚乳酸,由于增强的表面特性,显示出增加的Cr (VI) 吸附. 年龄较大的MP会更强烈地结合Cr,从而降低了脱吸率.
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) 是新兴的污染物,可以在水生环境中吸附重金属.
- 国会议员的紫外线诱导的衰老改变了它们的表面特性,影响了它们与污染物的相互作用.
- 关于老年MP对重金属吸附和脱吸的协同作用的研究有限.
研究的目的:
- 调查紫外线老化聚胺 (PA) 和聚乳酸 (PLA) 微塑料在CrVI上的吸附和脱附行为.
- 阐明管理老年国会议员和CrVI之间的相互作用的协同机制.
主要方法:
- 紫外线辐射被用于老化PA和PLA微塑料.
- 在原始和老化的MP上进行了Cr(VI) 的吸附和脱附实验.
- 分析了表面特性 (特定表面积,电荷,氧基,水友性).
- 吸附动力学和同热量被模拟使用Langmuir和伪二阶模型.
主要成果:
- 紫外线老化显著增加了MP的特定表面积,负电荷和氧基团,增强了水友性.
- 年龄较大的MP显示出明显增强的Cr(VI) 吸附能力,顺序是:年龄-PA>原始-PA>年龄-PLA>原始-PLA.
- 吸附遵循兰迈尔和伪二阶模型,表明化学和单层吸附.
- 在模拟的胃液中,Cr (VI) 的脱吸率更高;然而,由于结合更强,老年MP的脱吸率较低.
- 结合机制包括静电吸引,还原反应和氧基团的化.
结论:
- 紫外线老化通过改变表面化学物质,提高了PA和PLA微塑料的Cr(VI) 吸附能力.
- 年龄较大的MP表现出更强的Cr(VI结合亲和力,导致脱吸减少.
- 了解老年国会议员和重金属之间的相互作用对于管理联合污染至关重要.
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