聚乙烯纳米塑料与含杂质的化的相互作用,以及对复杂颗粒沉积的影响
Leiye Sun1, Jiayan Wu1, Meiqing Chen1
1School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
The Science of the total environment
|August 1, 2023
概括
纳米塑料 (NPs) 与含有杂质的化 (ImFh) 聚合,形成影响环境命运的复杂颗粒. 像这样的杂质会增强聚合,而和会减少聚合,影响NP的稳定性和沉积.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 纳米塑料 (NPs) 是环境污染物,通常与含杂质的化 (ImFh) 发现.
- 了解NP和ImFh之间的相互作用对于预测它们的环境命运和运输至关重要.
研究的目的:
- 研究聚乙烯纳米塑料 (PSNPs) 和含杂质铁 (ImFh) 之间的聚合.
- 在水系统中分析ImFh-PSNP复合粒子的沉积行为.
- 确定ImFh中的杂质 (Al,Mn,Si) 对PSNP聚合和稳定性的影响.
主要方法:
- 在固定的颗粒度 (100 mg/L ImFh,10 mg/L PSNP) 下对ImFh-PSNP相互作用进行系统的研究.
- 在不同pH和Na+度下评估聚合和稳定性.
- 使用了泽塔电位测量和德贾古恩-兰多-维维-奥弗比克 (DLVO) 理论计算.
主要成果:
- 单独的PSNP是稳定的,但与负电荷的ImFh相聚,形成ImFh-PSNP复合体并降低PSNP的稳定性.
- 通过增加pH和Na+度来抑制聚合,尽管高Na+ (>20mM) 诱导了PSNP同聚.
- 聚合能力顺序:Al轴承Fh > Fh > Mn轴承Fh > Si轴承Fh;Al增强了静电相互作用,Mn/Si减少了它.
结论:
- 铁酸盐中的杂质显著影响纳米塑料聚合和环境行为.
- 与纯铁或含Mn/Si的铁相比,含Al的铁促进了与纳米塑料的更强的聚合.
- ImFh-PSNP聚合抑制沉积,聚合程度与抑制程度相关,受纳米塑料"静电贴片"的影响.
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