Cs₂AgBiCl₆: a Novel, High‐Efficient and Stable Visible‐Light Photocatalyst for Degradation of Organic Dyes

Abstract In the past decades, great efforts have been made to develop novel visible‐light photocatalysts to achieve high photocatalytic efficiency by utilizing visible light, the largest proportion of solar energy. As a new type of photocatalyst materials, all‐inorganic lead‐free halide double perovskites have begun to attract widespread interest. Herein, double perovskite Cs 2 AgBiCl 6 was developed into a visible‐light photocatalyst for degrading organic dyes. Cs 2 AgBiCl 6 was prepared by the hydrochloric acid precipitation and anti‐solvent recrystallization methods, respectively, and was used to degrade organic dyes under visible light. Samples prepared by the anti‐solvent recrystallization method are smaller than those prepared by the hydrochloric acid precipitation method, which can degrade 95.7 % of Sudan III in 10 min and show excellent photocatalytic activity. The cyclic experiments demonstrate that Cs 2 AgBiCl 6 has a good cycle stability. Moreover, Cs 2 AgBiCl 6 ‐AS also exhibits good photocatalytic degradation ability for Methyl red and Malachite green. These distinctive results indicate that Cs 2 AgBiCl 6 may be a promising material for developing novel, high‐efficient and stable visible‐light photocatalysts.