Increasing the charge separation and the utilization efficiency of sunlight are essential factors in a photocatalytic process.In this study,we prepared crystalline N-CQDs@W18O49 heterostructures,through the in situ growth of W18O49 nanocrystals on nitrogen-doped carbon quantum dots (N-CQDs).N-CQDs@W18O49 nanocomposites showed high activity in the photodegradation of ciprofloxacin (CIP)and methyl orange (MO).The photodegradation activity of the optimized N-CQDs@W18O49-5 sample was four times higher than that of W1aO49 under ultraviolet-visible (UV-vis) light irradiation.The p hotodegradation activity of N-CQDs@W18O49-5 sample was two times higher than that of W18O49 under near-infrared (NIR) light irradiation.The enhanced photosensitivity of the nanocomposites was attributed to the promotion of charge separation by N-CQDs and the local surface plasmon resonance(LSPR) effect of W18O49 under NIR light irradiation.This work provides a promising approach for designing and manufacturing photocatalysts with full-spectral responsiveness and improved charge separation.