吸附
化学
环境化学
微塑料
表面电荷
Zeta电位
化学工程
腐植酸
纳米颗粒
水溶液
氧化物
微观世界
蒸馏水
吸附
色谱法
有机化学
肥料
物理化学
工程类
作者
Nisha Singh,Nitin Khandelwal,Nabanita Naskar,Susanta Lahiri,Johannes Lützenkirchen,Gopala Krishna Darbha
出处
期刊:Water Research
[Elsevier]
日期:2021-02-01
卷期号:189: 116622-116622
被引量:41
标识
DOI:10.1016/j.watres.2020.116622
摘要
The ubiquitous distribution of microplastics (MPs) leads to inevitable interactions with the toxic pollutants present in the environment including metal-oxide nanoparticles. This study investigates the interaction of CeO2 nanoparticles (CeNPs) with MPs generated from a disposable plastic container. Further, rough MPs (R-MPs), generated through mechanical abrasion of MPs with sand, were used to probe the impact of roughness. To understand the sorption kinetics and underlying interaction processes, batch experiments were carried out. The results distinctly indicate that CeNPs sorption occurred on MPs surfaces and was consistent with the pseudo-second order kinetics model. For pristine MPs, the sorption capacity was as high as 12.9 mg/g while for R-MPs kinetic equilibrium was achieved faster and an enhanced sorption capacity (13.4 mg/g) was identified. A rise in sorption with an increase in salinity was noted while pH and humic acid exhibited a negative correlation. The observed interactions were attributed to the aggregation profile and surface charge of CeNPs and MPs. Surprisingly, CeNPs also got loaded onto MPs in non-agitated and undisturbed conditions. The sorption process was influenced by the type of aqueous matrix and the sorption capacity at equilibrium followed the trend: distilled water> synthetic freshwater> river water. FTIR spectra, zeta potential, SEM imaging, and elemental mapping revealed electrostatic interaction as the dominant mechanism. This work contributes towards the knowledge gap on the environmental risk of MPs.
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