Extracting carbon quantum dots (CQDs) from a glycerol-based medium typically involves a series of steps designed to isolate and purify the CQDs formed in the medium.

• Synthesize CQDs by hydrothermal or microwave methods using glycerol as a carbon source.
• Purify CQDs through centrifugation, dialysis, or filtration.
• Extract CQDs from the glycerol medium using solvent precipitation, freeze-drying, or evaporation.
• Characterize the CQDs using UV-Vis, fluorescence, TEM, and other techniques.