Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources & Environment, Nanchang University, Nanchang, 330031, People's Republic of China.
Bull Environ Contam Toxicol. 2022 Jun;108(6):1098-1103. doi: 10.1007/s00128-022-03509-3. Epub 2022 Mar 26.
Organic modified layered double hydroxides (O-LDHs), known as attractive adsorbents for organic pollutants, may pose severe toxicity to the aquatic organisms during their large-scale application. However, little information is available on the toxicity of O-LDHs and the joint toxicity with the coexisted organic pollutants. Herein, we employed organic three-dimensional layered double hydroxide (O3D-LDH) and methyl orange (MO) as representative to investigate the toxicity mechanisms of single substance and its binary mixture on green algae Chlorella vulgaris. Results showed that O3D-LDH and MO presented concentration-dependent toxicity, the binary mixture showed additive effect after exposed to low O3D-LDH concentration (≤ 50 mg/L), but antagonism was observed for the other. It revealed that the agglomeration of O3D-LDH and microalgae influenced chlorophyll content, eventually inhibiting the growth of algae. Overall, this toxicity investigation was critical for understanding the environmental risk of organic LDHs to provide theorical guidance for their practical application in the water purification.
有机改性层状双氢氧化物（O-LDHs）作为有机污染物的一种有吸引力的吸附剂，在大规模应用过程中可能对水生生物产生严重毒性。然而，关于 O-LDHs 的毒性及其与共存有机污染物的联合毒性的信息很少。在此，我们采用有机三维层状双氢氧化物（O3D-LDH）和甲基橙（MO）作为代表性物质，研究了单一物质及其二元混合物对绿藻小球藻的毒性机制。结果表明，O3D-LDH 和 MO 表现出浓度依赖性毒性，在暴露于低浓度 O3D-LDH（≤50mg/L）时，二元混合物表现出相加作用，但在其他情况下则表现出拮抗作用。这表明 O3D-LDH 的聚集和微藻影响叶绿素含量，最终抑制藻类的生长。总的来说，这项毒性研究对于了解有机 LDHs 对环境的风险至关重要，为其在水净化中的实际应用提供了理论指导。
