“…20,21 Thus, CQDs have been extensively used in the decoration of semiconductor materials to improve their photovoltaic properties leading to enhanced photocatalytic performance. 22,23 Moreover, the presence of CQDs speeds up the separation of photogenerated electron–hole pairs, promoting the use of more reactive species of holes and ·O 2 − in the photocatalytic system. 24,25 Due to the excellent merits, recently, a series of CQDs-based binary or ternary composites with efficient photocatalytic performance have been developed, such as CQDs/Bi 3 O 4 Br, 21 CQDs/BiOCl/CEM, 24 CdS/CQDs/g-C 3 N 4 , 26 CQDs/TiO 2 , 27 TiO 2 /WO 3 /CQDs, 28 etc .…”