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| Sample | S (wt%) | Cr (wt%) | Na (wt%) | Na+/S3− |
|---|---|---|---|---|
| MIL-101-SO3HHCl | 6.79 | 15.72 | 0.73 | 0.11 |
| MIL-101-SO3H(Na)NaAC | 7.10 | 13.88 | 2.65 | 0.37 |
| MIL-101-SO3HNaAc | 6.05 | 13.8 | 2.04 | 0.34 |
| MIL-101-SO3HHF | 5.93 | 12.73 | 1.96 | 0.33 |
