Table 1.
Physicochemical characteristics of the MWCNT library
| MWCNT sample |
ICP-MSa residues (%) |
Raman spectroscopy | EDXb | XPSc | Kaiser test | BETd | Pore volume | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Al | TEe | ID1/IG | ACf | C (%) | O(%) | N(%) | C(%) | O(%) | N(%) | (μmol/g) | (m2/g) | (μl/g) | |
| NC7000 | 4.43 | 0.54 | 1.29 | 4.68 | 92.05 | 3.19 | 0 | 97.8 | 1.4 | 0 | – | 24 | 61 |
| TP7000 | 0.04 | 0.16 | 0.47 | 0.48 | 98.89 | 1.06 | 0 | 99.4 | 0.6 | 0 | – | 30 | 83 |
| TP-COOH | – | – | 0.41 | 0.81 | 98.59 | 1.22 | 0 | 95.1 | 4.4 | 0.5 | – | 141 | 381 |
| TP-NH2 | – | – | 0.39 | 1.92 | 90.97 | 5.99 | 3.02 | 86.3 | 7.3 | 6.4 | 47 | 182 | 402 |
| CP7000 | 0.13 | 0.15 | 1.28 | 4.07 | 98.88 | 0.98 | 0 | 98.1 | 1.9 | 0 | – | 30 | 111 |
| CP-COOH | – | – | 1.16 | 5.00 | 95.47 | 4.33 | 0 | 94.1 | 5.9 | 0 | – | 179 | 521 |
| CP-NH2 | – | – | 1.28 | 4.53 | 97.62 | 1.17 | 0.78 | 98.6 | 0.7 | 0.5 | 62 | 111 | 330 |
aTE, transition elements (Co and Fe)
bEDX, energy dispersive X-ray analysis
cXPS, X-ray photoelectron spectroscopy
dBET, Brunauer, Emmett and Teller analysis
eTE, transition elements (Co and Fe)
fAC amorphous carbon content estimated from the area of the D3 band expressed as area percent from the total deconvoluted Raman spectra (see Additional File 3)