AI Article Synopsis
- The study investigates how nanoparticles (NPs), heavy metals, and natural organic matter interact in water, focusing on the behaviors and environmental risks of CuO NPs with humic acid (HA) and cadmium (Cd).
- The research finds that pH levels have a more significant impact on NP aggregation than the order in which components are added, while the contact sequence greatly influences NP solubility.
- Pre-mixing CuO NPs with HA before adding Cd leads to higher solubility and lower aggregation of the NPs, and HA boosts the Cd-adsorption capacity of CuO NPs at higher pH levels.
Article Abstract
Nanoparticles (NPs), heavy metals and natural organic matter may co-exist in the water bodies. Currently, knowledge on their interaction effects on the behaviors and fates of NPs and heavy metal ions is rather limited, which is critical to comprehensively understand their environmental risk. In this study, the aggregation, solubility and Cd-adsorption of CuO NPs co-existing with humic acid (HA) and Cd upon different solution pH and contact sequences were determined. In the ternary systems of CuO NPs, HA and Cd, pH was more important than the contact sequence of the components in affecting the NP aggregation, while the contact sequence was a predominant factor in determining the NP solubility. Pre-equilibration of CuO NPs and HA before addition of Cd resulted in the highest solubility and lowest aggregation of the NPs, relative to other sequences of addition of the components. The adsorption capacity of CuO NPs for Cd-ions increased with an increasing pH value from 5 to 9. HA significantly enhanced the Cd-adsorption capacity of CuO NPs at pH 7 and 9, while at pH 5 a non-significant effect was observed. The results are helpful to better estimate the behaviors and fates of CuO NPs and Cd when they coexisting in natural waters.
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| http://dx.doi.org/10.1016/j.jenvman.2022.114770 | DOI Listing |
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