Abstract：
The interaction between nanoscale copper oxides (nano-CuOs) and soil matrix significantly affects their fate and transport in soils. This study investigates the retention of nano-CuOs and Cu2+ ions in ten typical agricultural soils by employing the Freundlich adsorption model. Retention of nano-CuOs and Cu2+ in soils was well fitted by the Freundlich model. The retention parameters (KD, KF, and N) followed an order of CuO NTs > CuO NPs > Cu2+, highlighting significant impact of nano-CuOs morphology. The KF and N values of CuO NPs/Cu2+ were positively correlated with soil pH and electrical conductivity (EC), but exhibited a weaker correlation for CuO NTs. Soil pH and/or EC could be used to predict KF and N values of CuO NPs or CuO NTs, with additional clay content should be included for Cu2+.The different relationship between retention parameters and soil properties may suggest that CuO NTs retention mainly caused by agglomeration, whereas adsorption and agglomeration were of equal importance to CuO NPs. The amendment of Ca2+ at low and medium concentration promoted retention of nano-CuOs in alkaline soils, but reduced at high concentration. These findings provided critical insights into the fate of nano-CuOs in soil environments, with significant implications for environmental risk assessment and soil remediation strategies.
摘要：
纳米氧化铜（nano-CuO）与土壤基质之间的相互作用显着影响其在土壤中的命运和迁移。本研究采用Freundlich吸附模型研究了纳米CuO和Cu2离子在十种典型农业土壤中的保留。Freundlich模型很好地拟合了纳米CuOs和Cu2在土壤中的保留。保留参数(KD，KF,和N)遵循CuONT>CuONP>Cu2+的顺序，突出纳米CuOs形态的显著影响。CuONPs/Cu2+的KF和N值与土壤pH和电导率(EC)呈正相关,但对CuONT的相关性较弱。土壤pH和/或EC可用于预测CuONPs或CuONTs的KF和N值，对于Cu2+，应包括额外的粘土含量。保留参数与土壤性质之间的不同关系可能表明CuONTs的保留主要是由团聚引起的，而吸附和团聚与CuONPs同等重要。在低和中等浓度下添加Ca2可促进纳米CuO在碱性土壤中的保留，但在高浓度时减少。这些发现为土壤环境中纳米CuO的命运提供了重要的见解，对环境风险评估和土壤修复策略具有重要意义。
