Table 3.
Selected carbon adsorbents with nitrogen containing functional groups for heavy metal removal
| Material | Heavy Metal | Qmax (mg/g) | Kinetic model | Isotherm | FG | Reference |
|---|---|---|---|---|---|---|
|
| ||||||
| Langmuir, | ||||||
| Polyrhodanine modified multi-walled CNTs | Pb(II) | 8118 | PSO | -NH2 | [193] | |
| Freundlich | ||||||
|
| ||||||
| Nitrogen-doped hierarchical microporous / mesoporous carbons | Pb(II) | 212 | PSO | Langmuir | -NH | [93] |
|
| ||||||
| Sulfuric acid doped poly diaminopyridine/graphene composite | Cr(VI) | 609.76 | PSO | Langmuir | -NH | [210] |
|
| ||||||
| polyethyleneimine and GO | Cr(VI) | 539.53 | PSO | Langmuir | -NH2 | [198] |
| Poly(m-phenylenediamine)-coated Fe3O4/o-MWCNTs | Cr(VI) | 346 | PSO | Langmuir | -NH | [178] |
| CoFe2O4-chitosan-graphene | Hg(II) | 361 | PSO | Langmuir | -NH2 | [201] |
| CNT-CONH2 | Hg(II) | 332.6 | - | Langmuir | -NH2 | [199] |
| EDTA functionalized magnetic GO | Hg(II) | 268.4 | PSO | Freundlich | -NH2 | [92] |
| AC | Cd(II) | 388.7 | - | Langmuir | -NH | [203] |
| GO | Ni(II) | 180.893 | PSO | Langmuir | -C=N, -C-N | [196] |
| L-Tryptophan functionalized GO | Cu(II) | 588 | PSO | Langmuir | -NH | [181] |
| Xanthated Fe3O4-chitosangrafted onto GO | Cu(II) | 426.8 | PSO | Langmuir | -NH | [166] |
| NH2-rich polymer/GO | Cu(II) | 349.04 | PSO | Langmuir | -NH2 | [211] |
| Chitosan/poly(ethylene oxide)/AC electrospun nanofibrous membrane | Cu(II) | 195.3 | - | Langmuir | -NH2 | [72] |
| Amination GO | Co(II) | 116.35 | PSO | Langmuir | -NH2 | [94] |
| Chitosan/poly(ethylene oxide)/AC electrospun nanofibrous membrane | Zn(II) Fe(III) |
186.2 217.4 |
- | Langmuir | -NH2 | [72] |
| Amidoxime-graftedmultiwalled CNTs | U(VI) | 145 | PSO | Langmuir | -NH2 | [192] |
| Chitosan/GO | Au(II) | 1076.65 | PSO | Langmuir | -NH2 | [209] |