Bathi Jejal Reddy, Roy Shuvashish, Tareq Syed, Potts Gretchen E, Palchoudhury Soubantika, Sweck Samantha O, Gadhamshetty Venkataramana
Civil and Chemical Engineering, University of Tennessee at Chattanooga, 615 McCallie Ave, Chattanooga, TN 37403, USA.
Chemistry and Physics, University of Tennessee at Chattanooga, 615 McCallie Ave, Chattanooga, TN 37403, USA.
Materials (Basel). 2022 Sep 28;15(19):6733. doi: 10.3390/ma15196733.
The use of diverse metal nanoparticles (MNPs) in a wide range of commercial products has led to their co-existence in the aqueous environment. The current study explores the dispersion and aggregation fate of five prominent MNPs (silver, copper, iron, nickel, and titanium), in both their individual and co-existing forms. We address a knowledge gap regarding their environmental fate under turbulent condition akin to flowing rivers. We present tandem analytical techniques based on dynamic light scattering, ultraviolet-visible spectroscopy, and inductively coupled plasma atomic emission spectroscopy for discerning their dispersion behavior under residence times of turbulence, ranging from 0.25 to 4 h. The MNPs displayed a multimodal trend for dispersion and aggregation behavior with suspension time in aqueous samples. The extent of dispersion was variable and depended upon intrinsic properties of MNPs. However, the co-existing MNPs displayed a dominant hetero-aggregation effect, independent of the residence times. Further research with use of real-world environmental samples can provide additional insights on the effects of sample chemistry on MNPs fate.
多种金属纳米颗粒（MNPs）在广泛的商业产品中的使用导致它们在水环境中共存。当前的研究探索了五种主要的金属纳米颗粒（银、铜、铁、镍和钛）以单独形式和共存形式存在时的分散和聚集情况。我们解决了一个关于它们在类似于河流流动的湍流条件下的环境归宿的知识空白。我们提出了基于动态光散射、紫外可见光谱和电感耦合等离子体原子发射光谱的串联分析技术，以辨别它们在0.25至4小时的湍流停留时间下的分散行为。金属纳米颗粒在水性样品中的分散和聚集行为随悬浮时间呈现出多峰趋势。分散程度是可变的，并且取决于金属纳米颗粒的固有特性。然而，共存的金属纳米颗粒表现出主要的异质聚集效应，与停留时间无关。使用实际环境样品的进一步研究可以提供关于样品化学对金属纳米颗粒归宿影响的更多见解。
