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| Concentration of Cr(vi) ions (mg L−1) | q e (mg g−1) | k 2 (g mg−1 min−1) | R 2 |
|---|---|---|---|
| 150 | 261.78 | 9.588 × 10−5 | 0.9943 |
| 200 | 316.45 | 7.856 × 10−5 | 0.9941 |
| 250 | 350.87 | 7.454 × 10−5 | 0.9936 |
| 300 | 364.96 | 7.396 × 10−5 | 0.9955 |
