Table 2.
Average diffusion coefficient (Di) of Pb ions in the investigated systems.
| System | Di (10–5 cm2/s) |
|---|---|
| CNT@20Pb | 0.0205 (+ /− 0.0007) |
| CNTCOO-@20Pb | 0.0191 (+ /− 0.0032) |
| CNTCOOH@20Pb | 0.0198 (+ /− 0.0022) |
| BNNT@20Pb | 0.0268 (+ /− 0.0039) |
| BNNTCOO−@20Pb | 0.0250 (+ /− 0.0050) |
| BNNTCOOH@20Pb | 0.0148 (+ /− 0.0031) |
| CNT@50Pb | 0.0048 (+ /− 0.0008) |
| CNTCOO−@50Pb | 0.0080 (+ /− 0.0017) |
| CNTCOOH@50Pb | 0.0081 (+ /− 0.0004) |
| BNNT@50Pb | 0.0083 (+ /− 0.0006) |
| BNNTCOO−@50Pb | 0.0069 (+ /− 0.0002) |
| BNNTCOOH@50Pb | 0.0080 (+ /− 0.0013) |