High degradation efficiency and high cyclic stability of nano-sized Cs2AgBiCl6 photocatalyst synthesized via a facile one-step grinding method

A lead-free double perovskite material is being considered as a substitute for lead-based perovskites due to its promising benefits in the photocatalytic degradation of organic dyes. In this study, Cs 2 AgBiCl 6 , a A 2 BB’X 6 -structured halide double perovskite, was prepared by one-step grinding method and hydrochloric acid precipitation method, respectively, and was used to degrade organic dyes in an ethanol solution under visible light. It is shown that the nano-sized Cs 2 AgBiCl 6 sample prepared by the one-step grinding method (Cs 2 AgBiCl 6 -G) can degrade 98 % of Sudan Red III within 10 min, which is highly comparable with the sample prepared using the hydrochloric acid precipitation method (Cs 2 AgBiCl 6 -P). Cyclic experiments demonstrated that Cs 2 AgBiCl 6 -G exhibited superior cyclic catalytic performance compared to the Cs 2 AgBiCl 6 -P samples. In addition, the former also exhibited better photocatalytic degradation for methyl orange, rhodamine B, and methylene blue. This indicates that this facile one-step grinding method can be utilized a large-scale effective preparation technique for producing high yield, eco-friendly, highly efficient and stable Cs 2 AgBiCl 6 photocatalyst.