▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped carbon quantum dot (NCQD)/three-dimensional graphene aerogel photocatalyst comprises pyrolyzing aspartic acid at 270-290 degrees C for 90-110 hours, neutralizing with sodium hydroxide solution, centrifuging to remove impurities, collecting the supernatant i.e. NCQDs stock solution, rotary evaporating to obtain NCQDs concentrated liquid, freeze drying to obtain NCQDs, preparing into NCQDs aqueous solution, dispersing in graphene oxide solution, conducting hydrothermal reaction at 170-190 degrees C for 12-14 hours, obtaining NCQD/three-dimensional graphene hydrogel, and freeze drying. USE - Preparation of NCQD/three-dimensional graphene aerogel photocatalyst used for photocatalytically degrading heavy metal ion (claimed) i.e. hexavalent chromium ions. ADVANTAGE - The method is simple and easy and provides NCQD/three-dimensional graphene aerogel photocatalyst, which has high catalytic efficiency and uses visible light as driving energy and water as solvent for degrading the hexavalent chromium ions, which is beneficial for the sustainable development of environment and energy. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) NCQD/three-dimensional graphene aerogel photocatalyst; and (2) regeneration of NCQD/three-dimensional graphene aerogel photocatalyst comprising after photocatalytic degradation of heavy metal ions, recycling the NCQD/three-dimensional graphene aerogel photocatalyst, adding NCQDs water solution, putting in PTFE reaction kettle, conducting hydrothermal reaction at 170-190 degrees C for 12-14 hours to obtain regenerated NCQDs/three-dimensional graphene aerogel.