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Influence of nanoparticle doping on the colloidal stability and toxicity of copper oxide nanoparticles in synthetic and natural waters
Water Research ( IF 12.8 ) Pub Date : 2017-12-28 , DOI: 10.1016/j.watres.2017.12.069
Adeyemi S. Adeleye , Suman Pokhrel , Lutz Mädler , Arturo A. Keller

Engineered nanoparticles (NPs) are often doped with other elements to improve their functionality and, at times, physical and/or chemical stability. However, the effect of doping on the environmental implications of NPs is not well-understood. We investigated the colloidal stability and effects of CuO NPs doped with Fe (0–10%). Colloidal stability of the Fe-doped CuO NPs in aqueous media, as determined by critical coagulation concentrations of NaCl, decreased with increased Fe-doping. However, decrease in the overall particle density led to slower sedimentation of Fe-doped CuO NPs than would have been predicted from their aggregation behavior. Fe-doping significantly affected CuO dissolution (p < .001), promoting Cu leaching out from the doped NPs due to increased reactivity at neutral pH and increased surface area with Fe-doping. Fe-doping did not increase the toxicity of CuO to a marine phytoplankton, Isochrysis galbana, despite promoting ionic Cu release. Total suspended Cu was dominated by dissolved Cu complexes in seawater and particulate Cu in freshwater. Based on the abundance of different size fractions analyzed in freshwater, the particles detected in water suspension were mostly (≥50%) larger than 200 nm in diameter. However, these large-sized particles are mainly composed of aggregated nanosized particles held together by van der Waals attraction.



中文翻译:

纳米粒子掺杂对合成水和天然水中氧化铜纳米粒子的胶体稳定性和毒性的影响

工程纳米颗粒(NPs)通常掺有其他元素,以改善其功能性,有时还改善物理和/或化学稳定性。然而,掺杂对NPs的环境影响的影响尚不为人所知。我们研究了掺Fe(0-10%)的CuO NPs的胶体稳定性和影响。铁掺杂的CuO NPs在水性介质中的胶体稳定性(由NaCl的临界凝结浓度确定)随着铁掺杂的增加而降低。但是,总颗粒密度的降低导致掺铁的CuO NP的沉降比根据其聚集行为所预测的要慢。掺杂铁会显着影响CuO的溶解度(p <.001),由于在中性pH下反应性的提高和掺杂铁表面积的增加,促进了铜从掺杂的NP中浸出。等鞭藻,尽管促进了离子铜的释放。悬浮水中的铜总量以海水中溶解的铜络合物和淡水中的颗粒状铜为主导。根据淡水中分析的各种不同大小的丰度,在水悬浮液中检测到的颗粒大部分直径(大于50%)大于200 nm。然而,这些大尺寸颗粒主要由通过范德华吸引保持在一起的聚集的纳米尺寸颗粒组成。

更新日期:2017-12-31
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