Abstract
The development of new sorbents based on nanostructured carbon materials recently became a perspective field of research. Main topic of current study is to investigate the effect of different regimes of multiwall carbon nanotubes (MWCNT) surface modification process on their structural characteristics. MWCNT samples were treated with nitric acid at high temperature. Structural properties were studied using low temperature nitrogen adsorption and acid-base back titration methods. The study showed that diluted nitric acid does not affect MWCNT structure. Concentrated nitric acid treatment leads to formation of 2.8 carboxylic groups per 1 nm2 of the sample surface.
Highlights
Intensive development of new science-driven technologies of rare-earth metal extraction is one of the strategic goals of today’s industry
Specific surface area for multiwall carbon nanotubes (MWCNT) sample correlates with nanotube diameter measured from TEM
On the other hand concentrated nitric acid treatment leads to formation of oxygen-containing groups with simultaneous decrease in specific surface area values. This is probably caused by decrease of highly reactive amorphous carbon amount due to treatment process
Summary
Intensive development of new science-driven technologies of rare-earth metal extraction is one of the strategic goals of today’s industry. Main focus of research in this field is concentrated on the separation of so called allied substances. The problems of allied substances separation and purification are typically solved by ion-selective and ion-exchange processing. Ion-exchange technique shows good results when used for extraction and collection of low quantities of rare-earth metal contaminations. Carbon nanotubes are known to have good sorption properties due to the high specific surface area which goes up to 2000 m2/g for single walled carbon nanotubes. MWCNTs have lower values of specific surface area varying from 150 to 600 m2/g but even this is quite high compared to other traditional sorbents. Graphene is considered good sorption agent with specific surface area of 200-700 m2/g and in some cases even up to 1000 m2/g
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