| WRN | Waste rice noodle |
| IOS | Iron oxide scale |
| CQDs | Carbon quantum dots |
| Symbols | |
| CQDs/FeOx-x | Samples of CQDs/FeOx composites with different calcination temperatures (x = 1, 2, 3, 4, 5) and different carbon contents (x = 3, 6, 7) |
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