Aqueous suspensions of carbon nanotubes: surface oxidation, colloidal stability and uranium sorption.
Aqueous suspensions of carbon nanotubes: surface oxidation, colloidal stability and uranium sorption.
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DOI：
10.1016/j.envpol.2008.09.045
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发表时间：
2009-04
影响因子：
8.9
通讯作者：
A. Schierz;H. Zänker
中科院分区：
文献类型：
--
作者：
A. Schierz;H. Zänker
本研究的目的是获得信息的碳纳米管（CNT）作为潜在的载体的污染物的情况下，意外CNT释放到环境中的碳纳米管作为一个潜在的吸附材料在水净化的性能。碳纳米管的酸处理对（i）表面性质，（ii）胶体稳定性和（iii）重金属吸附的影响进行了研究，后者的例子是铀（VI）吸附。有一个显着的影响，表面处理上的行为的碳纳米管在水悬浮液。结果表明，酸处理增加了碳纳米管表面酸性基团的数量。因此，酸处理对CNT的胶体稳定性和它们对U（VI）的吸附能力具有增加的影响。另一种稳定水悬浮液中原始CNT胶体的方法是添加腐殖酸。
The objective of this study is to obtain information on the behaviour of carbon nanotubes (CNTs) as potential carriers of pollutants in the case of accidental CNT release to the environment and on the properties of CNTs as a potential adsorbent material in water purification. The effects of acid treatment of CNTs on (i) the surface properties, (ii) the colloidal stability and (iii) heavy metal sorption are investigated, the latter being exemplified by uranium(VI) sorption. There is a pronounced influence of surface treatment on the behaviour of the CNTs in aqueous suspension. Results showed that acid treatment increases the amount of acidic surface groups on the CNTs. Therefore, acid treatment has an increasing effect on the colloidal stability of the CNTs and on their adsorption capacity for U(VI). Another way to stabilise colloids of pristine CNTs in aqueous suspension is the addition of humic acid.