“…1 In 1972, Fujishima et al 2 discovered the photolysis of water by TiO 2 under sunlight irradiation, and then photocatalytic technology was rapidly developed. Nowadays, TiO 2 , 3,4 ZnO, 5,6 and SnO 2 , 7,8 etc., are the more mature semiconductor photocatalysts, but they all have wider band gaps and only respond to ultraviolet light, which limits their practical application. Therefore, a new type of photocatalyst with stable, highly efficient, recyclable and visible light response characteristics is desired.…”