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Surface composition and relative concentration of elements obtained by XPS analysis of the marine sponge skeleton, C.I. Natural Red 4, and selected hybrid materials.
| Sample | C | N | O | K | S | Zn | Si |
|---|---|---|---|---|---|---|---|
| Hippospongia communis | 72.54 | 5.25 | 22.21 | – | – | – | – |
| C.I. Natural Red 4 | 57.90 | 4.17 | 31.43 | 3.60 | 0.83 | 2.05 | – |
| Sample 1 (25 mg/L, 30 min, pH = 3) | 66.63 | 7.37 | 24.44 | – | – | 0.16 | 1.40 |
| Sample 2 (50 mg/L, 30 min, pH = 3) | 67.59 | 6.08 | 24.75 | – | – | 0.18 | 1.40 |
| Sample 3 (75 mg/L, 30 min, pH = 3) | 68.52 | 4.85 | 26.32 | – | – | 0.31 | – |
