Fabricating CsPbX3/CN heterostructures with enhanced photocatalytic activity for penicillins 6-APA degradation

Fabrication of CsPbX 3 (X = Cl, Br)/graphitic carbon nitride (CN) composite has proved to be an efficient way to improve the stability of CsPbX 3 nanocrystals (NCs) and improve their photocatalytic activities. Here, the CsPbBr 3 /CN and CsPbCl 3 /CN heterostructures were successfully prepared, based on the band structure, the CsPbBr 3 /CN is indexed as a type I heterostructure, and CsPbCl 3 /CN is indexed as a type II heterostructure. Both CsPbX 3 /CN heterostructure could facilitate the electron-hole pairs (e − -h + ) separation and exhibit the outstanding photocatalytic activity for penicillins 6-aminopenicillanic acid (6-APA) degradation under visible light, the degradation rates of 6-APA with CsPbCl 3 /CN and CsPbBr 3 /CN composite were about 78.11 and 83.31% in 120 min, respectively. The improved photocatalytic activity of the CsPbX 3 /CN heterostructures could be attributed to the favourable adsorbability, the enhanced light-harvesting ability, the efficient charge separation ability, as well as the synergistic effects of CsPbX 3 NCs and CN . This work may not only open up a new insight for design of CsPbX 3 -based heterostructure as novel photocatalyst but also provide a new possibility for photocatalytic applications of perovskites-based NCs.