水溶液
纳米颗粒
电泳
离子强度
氧化物
化学
化学工程
海水
金属
吸附
沉积作用
无机化学
色谱法
有机化学
地质学
沉积物
古生物学
海洋学
工程类
作者
Arturo A. Keller,Hongtao Wang,Dongxu Zhou,Hunter S. Lenihan,Gary N. Cherr,Bradley J. Cardinale,Robert J. Miller,Zhaoxia Ji
摘要
There is a pressing need for information on the mobility of nanoparticles in the complex aqueous matrices found in realistic environmental conditions. We dispersed three different metal oxide nanoparticles (TiO2, ZnO and CeO2) in samples taken from eight different aqueous media associated with seawater, lagoon, river, and groundwater, and measured their electrophoretic mobility, state of aggregation, and rate of sedimentation. The electrophoretic mobility of the particles in a given aqueous media was dominated by the presence of natural organic matter (NOM) and ionic strength, and independent of pH. NOM adsorbed onto these nanoparticles significantly reduces their aggregation, stabilizing them under many conditions. The transition from reaction to diffusion limited aggregation occurs at an electrophoretic mobility from around −2 to −0.8 μm s−1 V−1 cm. These results are key for designing and interpreting nanoparticle ecotoxicity studies in various environmental conditions.
科研通智能强力驱动
Strongly Powered by AbleSci AI