Investigations on the variations of phase compositions and catalytic performance of Al3+-added Cs2AgInCl6 and Cs2AgBiCl6 double perovskite

Al 3+ -added Cs 2 AgInCl 6 and Cs 2 AgBiCl 6 catalysts were prepared by co-precipitation method. It is shown that the incorporation of high concentration of Al 3+ in Cs 2 AgInCl 6 (20% Al 3+ or above) and in Cs 2 AgBiCl 6 (with 50% Al 3+ or above) causes obvious phase separation and formation of secondary phase (AgCl). And the optical bandgaps of Al 3+ -added Cs 2 AgInCl 6 and Al 3+ -added Cs 2 AgBiCl 6 are about 3.5 eV and 2.7 eV, respectively. Benefiting from the enhanced carrier transfer in AgCl/Cs 2 AgInCl 6 heterojunction, Cs 2 AgInCl 6 :0.9Al 3+ exhibits excellent degradation performance for Sudan Red III with a rate above 97% within 16 min and catalytic cycles above 4 times. And Cs 2 AgBiCl 6 :0.7Al 3+ can degrade Sudan Red III at a rate higher than 96% within 14 min. And a new degradation pathway of Sudan Red III in ethanol solutions was proposed firstly. The Al 3+ -added Cs 2 AgInCl 6 and Cs 2 AgBiCl 6 catalysts also exhibit good cyclic and storage stabilities, showing potential applications in the photodegradation of organic pollutants.