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Decolorization percentages of crystal violet dye at different Hem-NPs concentrations, in different stimulation conditions (sunlight and dark), and for different contact times (A–D). Dye decolorization under sunlight and dark conditions (E 1–3), where E1 was the dye control, E2 was the dye under the dark condition, and E3 was the dye under the sunlight condition.
