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| Sample | NH4OH (mL) | TEOS (mL) | BET (m2 g−1) | Total pore volume (cm3 g−1) | Pore size distribution |
|---|---|---|---|---|---|
| 1a | 2 | 1 | 471 | 1.79 | 3.5 to 5.5 |
| 2b | 4 | 1 | 307 | 1.33 | 3.5 to 5.5 |
| 3c | 4 | 1.5 | 265 | 1.18 | 3.5 to 5.5 |
PS@Fe3O4@SiO2: ratio of TEOS : Fe3O4 : PS : NH4OH = 1 : 0.8 : 2 : 2.
PS@Fe3O4@SiO2: ratio of TEOS : Fe3O4 : PS : NH4OH = 1 : 0.8 : 2 : 4.
PS@Fe3O4@SiO2: ratio of TEOS : Fe3O4 : PS : NH4OH = 0.5 : 0.8 : 2 : 4.
