Aqueous suspensions of carbon nanotubes: Surface oxidation, colloidal stability and uranium sorption

被引：250
作者：
Schierz, A. [1 ]
Zaenker, H. [1 ]
机构：
[1] Forschungszentrum Dresden Rossendorf eV, Inst Radiochem, D-01314 Dresden, Germany
来源：
ENVIRONMENTAL POLLUTION | 2009年 / 157卷 / 04期
关键词：
Carbon nanotubes; Surface oxidation; Uranium; Sorption; Colloidal stability; NATURAL ORGANIC-MATTER; METAL-IONS; ADSORPTION; REMOVAL; BEHAVIOR; SOLUBILIZATION; DISPERSIONS; DESORPTION; ADSORBENT; TH(IV);
D O I：
10.1016/j.envpol.2008.09.045
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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. (C) 2008 Elsevier Ltd. All rights reserved.
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页码：1088 / 1094
页数：7
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