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Concentration and relative amount of surface OH groups determined by TGA and XPS.
| Sample | TGA | XPS | ||||
|---|---|---|---|---|---|---|
| OHweak (mmol/g) | OHstrong (mmol/g) | Relative Amount of OHstrong | TiOH a (mmol/g) | Ti-OH b (mmol/g) | Relative Amount of Ti-OH | |
| ST-01 | 1.73 | 0.59 | 1 | 4.67 | 0.51 | 1 |
| AHP-ST-01 | 2.47 | 3.61 | 6.1 | 3.62 | 2.74 | 5.4 |
a TiOH: bridging hydroxyl group; b Ti-OH: terminal hydroxyl group.
