Transport and retention of nanoscale C60 aggregates in water-saturated porous media
Transport and retention of nanoscale C60 aggregates in water-saturated porous media
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DOI：
10.1021/es800128m
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发表时间：
2008-05-15
影响因子：
11.4
通讯作者：
Pennell, Kurt D.
中科院分区：
文献类型：
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作者：
Wang, Yonggang;Li, Yusong;Pennell, Kurt D.
进行了实验和数学建模研究，以研究纳米级富勒烯聚集体（nC（60））在水饱和多孔介质中的传输和保留。将 nC(60) 聚集体（直径 95 nm，1 至 3 mg/L）的水悬浮液以 2.8 m/d 的达西速度引入填充有玻璃珠或渥太华砂的柱中。在 1.0 mM CaCl2 存在下，nC(60) 流出物突破曲线 (BTC) 逐渐增加至最大值，然后在重新引入不含 nC(60) 的溶液时急剧下降。玻璃珠柱中 nC(60) 的保留量为引入质量的 8% 至 49%，而渥太华砂柱中则保留了高达 77% 的质量。当仅用去离子水制备 nC60 悬浮液时，流出物 nC(60) BTC 与非反应性示踪剂 (Br-) 的流出物一致，且 nC(60) 保留最少。观察到的玻璃珠和渥太华砂中 nC(60) 传输和保留行为的差异与独立批次保留数据以及 nC(60) 和固体表面之间静电相互作用的理论计算一致。使用考虑了 nC(60) 附着动力学和限制保留能力的数值模型准确模拟流出物浓度和保留曲线数据。
Experimental and mathematical modeling studies were performed to investigate the transport and retention of nanoscale fullerene aggregates (nC(60)) in water-saturated porous media. Aqueous suspensions of nC(60) aggregates (95 nm diameter, 1 to 3 mg/L) were introduced into columns packed with either glass beads or Ottawa sand at a Darcy velocity of 2.8 m/d. In the presence of 1.0 mM CaCl2, nC(60) effluent breakthrough curves (BTCs) gradually increased to a maximum value and then declined sharply upon reintroduction of nC(60)-free solution. Retention of nC(60) in glass bead columns ranged from 8 to 49% of the introduced mass, while up to 77% of the mass was retained in Ottawa sand columns. When nC60 suspensions were prepared in deionized water alone, effluent nC(60) BTCs coincided with those of a nonreactive tracer (Br-), with minimal nC(60) retention. Observed differences in nC(60) transport and retention behavior in glass beads and Ottawa sand were consistent with independent batch retention data and theoretical calculations of electrostatic interactions between nC(60) and the solid surfaces. Effluent concentration and retention profile data were accurately simulated using a numerical model that accounted for nC(60) attachment kinetics and a limiting retention capacity.