Key Laboratory of Hydraulic and Waterway Engineering, Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China.
Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.
Molecules. 2024 Aug 29;29(17):4099. doi: 10.3390/molecules29174099.
Silver nanoparticles (AgNPs) with different sizes have been extensively adopted in various commercial products, causing ecological concerns because of the inevitable release of AgNPs into the environment. Hence, understanding the interaction of different-sized AgNPs with environmental substances is important for assessing the environmental risk and fate of AgNPs. In this work, we investigated the impact of anions (NO, SO, HCO/CO, Cl) in aquatic environments on the physicochemical properties and antibacterial activity of different-sized AgNPs (20, 40 and 57 nm). The results showed that the anions whose corresponding silver-based products had lower solubility were more likely to decrease the zeta potential (more negative) of particles, inhibit the dissolution of AgNPs and reduce their antibacterial activity. This should be attributed to the easier generation of coating layers on the surface of AgNPs during the incubation process with such anions. Additionally, the generation of coating layers was also found to be particle-size dependent. The anions were more prone to adsorbing onto larger-sized AgNPs, promoting the formation of coating layers, subsequently resulting in more pronounced variations in the physicochemical properties and antibacterial activity of the larger-sized AgNPs. Therefore, larger-sized AgNPs were more prone to experiencing specific effects from the anions.
不同尺寸的银纳米粒子（AgNPs）已经广泛应用于各种商业产品中，由于 AgNPs 不可避免地会释放到环境中，因此引起了生态方面的关注。因此，了解不同尺寸的 AgNPs 与环境物质的相互作用对于评估 AgNPs 的环境风险和归宿非常重要。在这项工作中，我们研究了水体环境中的阴离子（NO、SO、HCO/CO、Cl）对不同尺寸的 AgNPs（20、40 和 57nm）的物理化学性质和抗菌活性的影响。结果表明，那些相应的银基产品溶解度较低的阴离子更有可能降低颗粒的动电位（更负），抑制 AgNPs 的溶解，并降低其抗菌活性。这应该归因于在与这些阴离子孵育的过程中，AgNPs 表面更容易生成包覆层。此外，还发现生成包覆层也与颗粒尺寸有关。阴离子更容易吸附在较大尺寸的 AgNPs 上，促进包覆层的形成，从而导致较大尺寸的 AgNPs 的物理化学性质和抗菌活性发生更显著的变化。因此，较大尺寸的 AgNPs 更容易受到阴离子的特定影响。
