Adsorption of Chromium(VI) Ions from Water by Carbon Nanotubes

Carbon nanotubes (CNTs), a new type of carbon material, show exceptional adsorption capability and a high adsorption efficiency for the removal of chromium(VI) ions from water over a broad pH range extending from 4.0 to 7.5. The largest adsorption capacity for CNTs occurred at pH 7.5 and attained a...

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Bibliographic Details
Published in:Adsorption science & technology 2004-07, Vol.22 (6), p.467-474
Main Authors: Di, Ze-Chao, Li, Yan-Hui, Luan, Zhao-Kun, Liang, Ji
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Carbon
Carbon nanotubes
Chemistry
Exact sciences and technology
General and physical chemistry
Ion concentration
Solid-liquid interface
Surface physical chemistry
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Summary:Carbon nanotubes (CNTs), a new type of carbon material, show exceptional adsorption capability and a high adsorption efficiency for the removal of chromium(VI) ions from water over a broad pH range extending from 4.0 to 7.5. The largest adsorption capacity for CNTs occurred at pH 7.5 and attained a value of 20.56 mg/g at an equilibrium Cr(VI) ion concentration of 33.28 mg/l. The adsorption rate of Cr(VI) ions was fast over the first 20 min with the adsorption capacity of the CNTs reaching 15 mg/g rapidly. The experimental results suggest that CNTs can be employed as good adsorbents for Cr(VI) ions and have great potential for applications in environmental protection.
ISSN:0263-6174
2048-4038
DOI:10.1260/0263617042879537