自然老化微塑料对重金属Cu(Ⅱ)、Pb(Ⅱ)、Cr(Ⅲ)的吸附综合性实验设计

Comprehensive experimental design of adsorption of heavy metals Cu(Ⅱ),Pb(Ⅱ)and Cr(Ⅲ)onto naturally-aged microplastics

作为一种新型污染物,微塑料释放到环境中并发生老化行为,与重金属等污染物相互作用形成复合污染物对环境及人类造成潜在威胁。因此,了解老化微塑料与重金属复合污染物的内部吸附过程与机制对于评估微塑料-重金属的复合毒性效应及其对环境的影响至关重要。该文选取Cu(Ⅱ)、Pb(Ⅱ)、Cr(Ⅲ)为典型重金属离子,研究自然老化微塑料对重金属离子的吸附动力学并分析粒径大小、盐度对吸附行为的影响,采用FTIR、XPS、SEM、BET、XRD对其进行表征,进一步探讨微塑料老化前后对重金属离子的吸附机制。该实验以环境新型污染物微塑料为研究对象,将基础教学内容与科研热点有机结合,兼具综合性、应用性和探究性,有利于培养学生的创新实践能力与科研素养。

As an emerging pollutant,microplastics are released into the environment and undergo aging behavior.Aged microplastics interacted with pollutants such as heavy metals and resulted in complex pollution,posing potential threats to the environment and humans.Therefore,understanding the interaction between aged microplastics and heavy metal ions is crucial for evaluating the combined toxicity of microplastics and heavy metals and their impacts on the environment.In this paper,Cu(Ⅱ),Pb(Ⅱ)and Cr(Ⅲ)are used as typical heavy metal ions to study the adsorption kinetics of naturally aged microplastics on typical heavy metal ions and analyze the effect of particle size and salinity on the adsorption behavior.It is characterized by FTIR,XPS,SEM,BET and XRD.Finally,the adsorption mechanism of microplastics on heavy metal ions before and after the aging of microplastics is discussed.This experiment takes microplastics,an emerging environmental pollutant,as the research object,and organically combined basic teaching content with scientific research hotspots,which is comprehensive,applicable and exploratory.It is beneficial to cultivate students’innovation comprehensive practical ability and scientific research literacy.