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| Parameter | CaO | HAp | HAp-nTiO2 | TiO2 |
|---|
| Specific surface area (m2 g−1) | 21 ± 0.02 | 56 ± 0.03 | 62 ± 0.05 | 78 ± 0.05 |
| Pore volume (cc g− 1) | 0.10 ± 0.02 | 0.46 ± 0.01 | 0.51 ± 0.02 | 0.55 ± 0.02 |
| Pore radius (Å) | 174 ± 0.12 | 165 ± 0.11 | 163 ± 0.21 | 154 ± 0.17 |
| Band gap energy (eV) | n.d* | n.d | 3.21 | 3.21 |
| Ca (wt%) | 23.5 ± 0.03 | 20.12 ± 0.02 | 34.70 ± 0.02 | – |
| O (wt%) | 73.8 ± 0.06 | 67.80 ± 0.05 | 44.24 ± 0.09 | 60.47 ± 0.05 |
| P (wt%) | n.d | 11.99 | 20.34 ± 0.01 | – |
| Ti (wt.) | n.d | n.d | 4.43 ± 0.06 | 38.98 ± 0.05 |
| TiO2 (wt%) | | | 7.40 ± 0.03 | 99.99 ± 0.01 |
