Aggregation, solubility and cadmium-adsorption capacity of CuO nanoparticles in aquatic environments: Effects of pH, natural organic matter and component addition sequence.
Xiao, Yinlong Tang, Wei Peijnenburg, Willie J G M Zhang, Xiaohong Wu, Jun Xu, Min Xiao, Hong He, Yan Luo, Ling Yang, Gang
Xiao, Yinlong
Tang, Wei
Peijnenburg, Willie J G M
Zhang, Xiaohong
Wu, Jun
Xu, Min
Xiao, Hong
He, Yan
Luo, Ling
Yang, Gang
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Series / Report no.
Open Access
Type
Article
Language
en
Date of publication
2022-02-21
Year of publication
Research Projects
Organizational Units
Journal Issue
Title
Aggregation, solubility and cadmium-adsorption capacity of CuO nanoparticles in aquatic environments: Effects of pH, natural organic matter and component addition sequence.
Translated Title
Published in
Journal of environmental management 2022;310:14770
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 Cd2+ upon different solution pH and contact sequences were determined. In the ternary systems of CuO NPs, HA and Cd2+, 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 Cd2+ 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 Cd2+ when they coexisting in natural waters.