Research Article
Carbon Nanotubes: Synthesis via Chemical Vapour Deposition without Hydrogen, Surface Modification, and Application
Table 2
Isotherm parameters calculated from the Langmuir model of Cu(II) adsorption onto many kinds of surface-modified CNTs.
| Sorbents | qm (mg·g−1) | R2 | References |
| CNTs ultrasonically stirred in KMnO4 and H2SO4 | 163.7 | 0.995 | The present study | CNTs refluxed in the solution of HNO3 and H2SO4 at 80°C for 48 h | 29.69 | 0.980 | [22] | CNTs refluxed in 65% HNO3 at 120°C for 48 h | 200 | 0.998 | [23] | MWCNTs ultrasonically stirred in 3 M HNO3 for 24 h | 3.439 | 0.932 | [24] | CNTs refluxed in concentrated HNO3 for 1 h at 140°C | 28.49 | 0.991 | [25] | MWCNTs ultrasonically suspended in 3 M HNO3 for 30 min and then stirred at 110°C for 48 h | 53 | 0.994 | [26] | CNTs ultrasonically immersed in 65% HNO3 for 30 min and then stirred for 3 h at 298 K | 13.87 | 0.980 | [27] | CNTs ultrasonically immersed in 60% NaClO for 30 min and then stirred for 3 h at 358 K | 47.39 | 0.987 | [27] | CNTs ultrasonically dispersed in 23% HCl and then stirred on a hot plate at 175°C–200°C for 3 h | 6.235 | 0.973 | [28] |
|
|