Sn 1/3 Na 2/3 Sn(OH) 6 Perovskite with Sn 4+ /Na + Disorder for Photocatalytic Degradation of 2,4-Dichlorophenol.

Cation disorder in hydroxide-based perovskites remains relatively under-researched. In this work, novel hydroxide-based perovskite Sn 1/3 Na 2/3 Sn(OH) 6 was first fabricated by a direct hydrothermal method, and its ability to photodegrade 2,4-dichlorophenol was evaluated. The synthesized photocatalyst is isostructural with MSn(OH) 6 (M = Mg, Ca, Sr, Mn, Fe, Co, Ni, or Zn), where the M site is occupied by disordered Sn 4+ /Na + . Sn 1/3 Na 2/3 Sn(OH) 6 exhibits outstanding photocatalytic activity under ultraviolet light. Specifically, 99% of 2,4-DCP is photodegraded in 40 min, with approximately 94% of its total chlorine content converted to Cl - anions. Radical trapping experiments indicated that superoxide radical anions (·O 2 - ) play a critical role during the photocatalytic process. Finally, liquid chromatography-tandem mass spectrometry was conducted to monitor the photocatalytic intermediates. Overall, our findings demonstrate that hydroxide-based perovskites with cation disorder show promise for application in photocatalysis.