期刊
CHEMOSPHERE
卷 82, 期 4, 页码 621-626出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2010.10.048
关键词
Carbon nanotubes; Calcium ions; Aggregation; Decontamination
资金
- China Natural Science Foundation [20871010, 21071094]
- China Ministry of Science and Technology [2011CB933402]
- Shanghai Leading Academic Disciplines [S30109]
The potential health and environmental hazards of carbon nanotubes (CNTs) have been a concerned issue. However, in contrast to the wide recognition of the toxicity of CNTs, little attention has been paid to the decontamination/remediation of CNT pollution. In this study, we report that CNTs can be removed from aqueous environment. In the presence of Ca2+. CNTs aggregate quickly to micron size and then enable easy and effective removal via normal filtration. After filtration, CNT suspension becomes colorless with the remnant CNT concentration less than 0.5 mu g mL(-1), a safe dose based on the published data. The filtration approach also works well in the presence of typical surfactant and dissolved organic matter. The removal efficiency is Ca2+ concentration-dependent and regulated by the initial pH value and ionic strength. Our study is helpful for future decontamination of CNTs from aqueous environment. (C) 2010 Elsevier Ltd. All rights reserved.
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