Modeling and sensitivity analysis on the transport of aluminum oxide nanoparticles in saturated sand: Effects of ionic strength, flow rate, and nanoparticle concentration

被引:21
作者
Rahman, Tanzina [1 ]
Millwater, Harry [1 ]
Shipley, Heather J. [1 ]
机构
[1] Univ Texas San Antonio, Dept Civil & Environm Engn, San Antonio, TX 78249 USA
基金
美国国家科学基金会;
关键词
Nanoparticle; Aluminum oxide; Transport modeling; Sensitivity analysis; Uncertainty quantification; POROUS-MEDIA; COLLOID TRANSPORT; DEPOSITION; FULLERENE; FILTRATION; MECHANISMS;
D O I
10.1016/j.scitotenv.2014.08.073
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Aluminum oxide nanoparticles have been widely used in various consumer products and there are growing concerns regarding their exposure in the environment. This study deals with the modeling, sensitivity analysis and uncertainty quantification of one-dimensional transport of nano-sized (similar to 82 nm) aluminum oxide particles in saturated sand. The transport of aluminum oxide nanoparticles was modeled using a two-kinetic-site model with a blocking function. The modeling was done at different ionic strengths, flow rates, and nanoparticle concentrations. The two sites representing fast and slow attachments along with a blocking term yielded good agreement with the experimental results from the column studies of aluminum oxide nanoparticles. The same model was used to simulate breakthrough curves under different conditions using experimental data and calculated 95% confidence bounds of the generated breakthroughs. The sensitivity analysis results showed that slow attachment was the most sensitive parameter for high influent concentrations (e.g. 150 mg/L Al2O3) and the maximum solid phase retention capacity (related to blocking function) was the most sensitive parameter for low concentrations (e.g. 50 mg/L Al2O3). (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:402 / 412
页数:11
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