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Optimization table for reduction of 4-Nitro aniline via rGO-NiO nanocomposite. (a) Reaction condition for ARS dye and (b) reaction condition for Indigo dye.
| Entry | Catalyst loading (mg) | Sodium borohydride loading (mmol) | Reduction time (h) |
|---|---|---|---|
| 1 | 1 | 1 | Not complete reduction |
| 2 | 2 | 1 | Not complete reduction |
| 3 | 3 | 1 | 4 |
| 4 | 4 | 1 | 2 |
| 5 | 4 | 0.6 | 3.50 |
| 6 | 4 | 0.75 | 3.30 |
| 7 | 5 | 1 | 2 |
| 8a | 4 | 1 | 1 |
| 9b | 4 | 1 | 4 |
