Liu Xueying, O'Carroll Denis M, Petersen Elijah J, Huang Qingguo, Anderson C Lindsay
Department of Civil & Environmental Engineering, The University of Western Ontario, London, ON, Canada N6A 5B8.
Environ Sci Technol. 2009 Nov 1;43(21):8153-8. doi: 10.1021/es901340d.
Engineered multiwalled carbon nanotubes (MWCNTs) are the subject of intense research and are expected to gain widespread usage in a broad variety of commercial products. However, concerns have been raised regarding potential environmental and human health risks. The mobility of MWCNTs in porous media is examined in this study using one-dimensional flow-through column experiments under conditions representative of subsurface and drinking water treatment systems. Results demonstrate that pore water velocity strongly influenced MWCNT transport, with high MWCNT mobility at pore water velocities greater than 4.0 m/d. A numerical simulator, which incorporated a newly developed theoretical collector efficiency relationship for MWCNTs in spherical porous media, was developed to model observed column results. The model, which incorporated traditional colloid filtration theory in conjunction with a site-blocking term, yielded good agreement with observed results in quartz sand-packed column experiments. Experiments were also conducted in glass bead-packed columns with the same mean grain size as the quartz sand-packed columns. MWCNTs were more mobile in the glass bead-packed columns.
工程化多壁碳纳米管（MWCNTs）是深入研究的对象，有望在多种商业产品中广泛应用。然而，人们对其潜在的环境和人类健康风险表示担忧。本研究通过一维流通柱实验，在代表地下和饮用水处理系统的条件下，研究了MWCNTs在多孔介质中的迁移率。结果表明，孔隙水速度对MWCNT的迁移有强烈影响，孔隙水速度大于4.0米/天时，MWCNT迁移率较高。开发了一个数值模拟器，该模拟器纳入了新开发的球形多孔介质中MWCNTs的理论收集器效率关系，以模拟观察到的柱实验结果。该模型结合了传统的胶体过滤理论和位点阻断项，与石英砂填充柱实验的观察结果吻合良好。还在与石英砂填充柱平均粒径相同的玻璃珠填充柱中进行了实验。MWCNTs在玻璃珠填充柱中的迁移性更强。
