17144-19-3Relevant articles and documents
Stable containment of radionuclides on the nanoscale by cut single-wall carbon nanotubes
Mackeyev, Yuri A.,Marks, John W.,Rosenblum, Michael G.,Wilson, Lon J.
, p. 5482 - 5484 (2005)
The physisorption of radiolabeled 125I- ions from aqueous solution and the Brunauer-Emmett-Teller (BET) surface areas of various carbonaceous materials [HiPco single-wall carbon nanotubes (SWNTs), F-SWNTs, cut SWNTs, charcoal, graphite, F-graphite and C60] have been measured and compared. By far, cut SWNTs (mainly 20-50 nm lengths) displayed the largest surface area of the materials (1180 m2g-1), being approximately double that of uncut SWNT and charcoal. At low concentrations of 125I-1, nearly all of the 125I- was adsorbed from aqueous solution within 1 min at room temperature by the cut SWNTs, uncut SWNTs, and charcoal; the other materials showed much less adsorption under the same conditions. Once adsorbed, the 125I- wash-off rate by pure water was highly variable but was especially slow for cut SWNTs (t1/2 a?? 2720 h) compared to the other materials; wash-off of 125I- by an aqueous H 2U2 solution (125I-H 2O2 125I2) was even slower (t1/2 a?? 14 300 h). Taken together, these data demonstrate the greatly increased surface area and dramatically enhanced retention properties of cut SWNTs over uncut SWNTs. ? 2005 American Chemical Society.
