Table 2.
Elemental composition and distribution of the type of nitrogen-containing groups on the surface of GO-U, Ge-OH-U, GO = O-U, GO-COOH-U, and GO-avg-U samples
|
Sample |
C/at.% |
N/at.% |
N/C/% |
N distribution/at.% |
|||
|---|---|---|---|---|---|---|---|
| N-6 (398.5 ± 0.3 eV) | N-5 (400 ± 0.2 eV) | N-Q (401.5 ± 0.3 eV) | N-X (404.4 ± 0.3 eV) | ||||
| GO-U |
77.7 |
9.5 |
12.2 |
2.6 |
5.1 |
1.5 |
0.2 |
| Ge-OH-U |
77.9 |
3.0 |
3.9 |
2.1 |
0.8 |
0.1 |
|
| GO = O-U |
74.3 |
4.2 |
5.7 |
1.1 |
2.8 |
0.3 |
|
| GO-OOH-U |
82.4 |
8.4 |
10.2 |
1.2 |
5.3 |
1.4 |
|
| GO-avg-U | 78.9 | 6.1 | 7.7 | 2.0 | 2.0 | 1.6 | 0.5 |