Cs₂ AgBiCl₆ : a Novel, High-Efficient and Stable Visible-Light Photocatalyst for Degradation of Organic Dyes

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 Cs₂ AgBiCl₆ was developed into a visible-light photocatalyst for degrading organic dyes. Cs₂ AgBiCl₆ 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 Cs₂ AgBiCl₆ has a good cycle stability. Moreover, Cs₂ AgBiCl₆ -AS also exhibits good photocatalytic degradation ability for Methyl red and Malachite green. These distinctive results indicate that Cs₂ AgBiCl₆ may be a promising material for developing novel, high-efficient and stable visible-light photocatalysts.