摘要
Microplastics(MPs)are of particular concern due to their ubiquitous occurrence and propensity to interact and concentrate various waterborne contaminants from aqueous surroundings.Studies on the interaction and joint toxicity of MPs on engineered nanoparticles(ENPs)are exhaustive,but limited research on the effect of MPs on the properties of ENPs in multisolute systems.Here,the effect of MPs on adsorption ability of ENPs to antibiotics was investigated for the first time.The results demonstrated that MPs enhanced the adsorption affinity of ENPs to antibiotics and MPs before and after aging showed different effects on ENPs.Aged polyamide prevented aggregation of ZnONPs by introducing negative charges,whereas virgin polyamide affected ZnONPs with the help of electrostatic attraction.FT-IR and XPS analyses were used to probe the physicochemical interactions between ENPs and MPs.The results showed no chemical interaction and electrostatic interactionwas the dominant force between them.Furthermore,the adsorption rate of antibiotics positively correlated with pH and humic acid but exhibited a negative correlation with ionic strength.Our study highlights that ENPs are highly capable of accumulating and transporting antibiotics in the presence of MPs,which could result in a widespread distribution of antibiotics and an expansion of their environmental risks and toxic effects on biota.It also improves our understanding of the mutual interaction of various co-existing contaminants in aqueous environments.
基金
supported by the National Youth Foundation of China(No.52000064)
the National Natural Science Foundation of China(No.U20A20323)
the Natural Science Foundation of Hunan Province(No.2023JJ0013)
the Special Funding for the Construction of Hunan’s Innovative Province(No.2021SK2040)
the Science and Technology Innovation Program of Hunan Province(No.2021RC3133)
the National Youth Foundation of China(No.52300227)
the HunanMunicipal Natural Science Foundation(No.2023JJ41048)
the Changsha Municipal Natural Science Foundation(No.kq2208423).
