School of Environmental Science and Engineering, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing, 210044, People's Republic of China.
College of Environmental Sciences and Engineering, Dalian Maritime University, Dalian, 116026, People's Republic of China.
Arch Environ Contam Toxicol. 2023 Apr;84(3):413-425. doi: 10.1007/s00244-023-00985-4. Epub 2023 Feb 15.
Advanced nanomaterials can be released into the environment and can coexist with natural organic matter (NOM). However, evidence on the impacts of NOM on the environmental behavior and toxicity of advanced nanomaterials is still scarce. Here, we investigated the behavior and toxic effects of two layered double hydroxides (LDHs) nanomaterials with different metallic constituents (Mg-Al-LDH and Zn-Al-LDH) at relatively low exposure concentrations on a freshwater green alga (Chlorella pyrenoidosa) in the absence and presence of two types of NOM, namely dissolved organic matter (DOM) and dealkaline lignin (DL). The DOM or DL interaction with the LDHs at different mixture levels was shown to be an antagonistic effect on the growth inhibition toxicity to C. pyrenoidosa mainly. The estimation of the index of Integrated Biological Responses version 2 indicated that the joint interaction of the LDHs with DOM or DL occurred in the following order of frequency synergism > antagonism > additivity. Furthermore, the physicochemical characteristics of LDHs were crucial for illuminating the mechanism by which the DOM or DL modified the LDH-induced oxidative stress response. These findings highlighted the important role of NOM in the behavior and effect of LDHs as a representative of a new class of multifunctional nanomaterials in the freshwater environment.
先进的纳米材料可以释放到环境中，并与天然有机物 (NOM) 共存。然而，关于 NOM 对先进纳米材料环境行为和毒性影响的证据仍然很少。在这里，我们研究了两种具有不同金属成分的层状双氢氧化物 (LDHs) 纳米材料（Mg-Al-LDH 和 Zn-Al-LDH）在相对低暴露浓度下，在不存在和存在两种类型的天然有机物（DOM 和去碱性木质素（DL）的情况下，对淡水绿藻（Chlorella pyrenoidosa）的行为和毒性效应。结果表明，DOM 或 DL 与 LDHs 在不同混合水平上的相互作用对 C. pyrenoidosa 的生长抑制毒性主要表现为拮抗作用。综合生物响应指数 2 的估计表明，LDHs 与 DOM 或 DL 的联合相互作用发生的频率依次为协同作用 > 拮抗作用 > 加性。此外，LDHs 的物理化学特性对于阐明 DOM 或 DL 修饰 LDH 诱导的氧化应激反应的机制至关重要。这些发现强调了 NOM 在 LDHs 行为和效应中的重要作用，因为 LDHs 是一类新的多功能纳米材料在淡水环境中的代表。
