Mobility of acid-treated carbon nanotubes in water-saturated porous media.
Mobility of acid-treated carbon nanotubes in water-saturated porous media.
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DOI：
10.2134/jeq2010.0311
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发表时间：
2011-11
影响因子：
2.4
通讯作者：
X. Peng;C. Du;Z. Liang;J. Wang;Z. Luan;W. Li
中科院分区：
文献类型：
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作者：
X. Peng;C. Du;Z. Liang;J. Wang;Z. Luan;W. Li
纳米材料的生产、使用和处置可能不可避免地导致它们出现在水中。随着围绕纳米材料的新兴产业的发展，人们似乎有必要关注纳米材料在环境中的传输。本文研究了酸处理的碳纳米管在多孔介质中的传输。在迁移率研究之前，用紫外-可见光谱研究了酸处理的碳纳米管分散体的稳定性，结果表明，在本工作所用的化学条件下，没有明显的聚集。迁移率研究表明，酸处理后的碳纳米管的迁移随着处理时间的延长而增加，这是由于粒子Zeta电位的增加。经硝酸处理2、6和12h的碳纳米管的Zeta电位分别为-30.0、-43.0和-48.5 mV。利用清洁床过滤理论，我们发现经过酸处理的碳纳米管在饱和玻璃微珠中的迁移距离分别为3.28、5.67和7.69米。结果表明，溶液离子强度和pH对酸处理后的碳纳米管的迁移率有重要影响。当pH从6.0时增加到7.9时，碳纳米管的迁移能力从2.96m增加到10.86m，离子强度从0.005增加到0.020时，碳纳米管的迁移能力从5.67m下降到1.42m。
The production, use, and disposal of nanomaterials may inevitably lead to their appearance in water. With the development of new industries around nanomaterials, it seems necessary to be concerned about the transport of nanomaterials in the environment. In this paper, the transport of acid-treated carbon nanotubes (CNTs) in porous media was investigated. Before the mobility investigation, the stability of acid-treated CNT dispersions was studied using ultraviolet-visible spectra and it was indicated that, under the chemical conditions employed in this work, there was no apparent aggregation. The mobility investigation showed that transport of acid-treated CNTs increased with treatment time due to increase in particle zeta potential. Carbon nanotubes treated with nitric acid for 2, 6, and 12 h possessed measured zeta potentials of -30.0, -43.0, and -48.5 mV, respectively. Utilizing clean-bed filtration theory, we showed that acid-treated CNTs have the potential to migrate 3.28, 5.67, and 7.69 m in saturated glass beads, respectively. We showed that solution ionic strength and pH have important effects on the mobility of acid-treated CNTs. Increasing the pH from 6.0 to 7.9 resulted in an increase in migration potential from 2.96 to 10.86 m. Increasing the ionic strength from 0.005 to 0.020 M resulted in a decrease in CNT migration potential from 5.67 to 1.42 m.