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The development of broad spectrum UV–visible-near-infrared (NIR) photocatalysts is a primary strategy in the area of photocatalytically mediated pollutant elimination. Herein, we report on a novel broad-spectrum N-doped carbon quantum dot/TiO₂ nanosheet with higher surface energy {0 0 1} faceted (NCD_S/TNS-001) composites with significantly improved broad-spectrum utilization. Under UV, visible, and near infrared light irradiation, NCD_S/TNS-001 exhibited higher photocatalytic activity than those of TNS-001, NCDs/P25, and NCDs/TiO₂ with {1 0 1} facets (NCDs/T-101) toward the degradation of diclofenac (DCF). This excellent photocatalytic performance might be attributed to the synergistic effects of the highly active {0 0 1} facets, up-converted fluorescent properties of NCDs, and efficient charge separation induced by fabricated heterostructures. The determination of reactive species revealed that O₂ …