Construction of heterojunction of Ag2S modified yttrium manganate visible photocatalyst and study on photocatalytic mechanism

Abstract

YMnO3@Ag2S photocatalyst was synthesized by surface reconstruction. The YMnO3 obtained by simple sol-gel method was lamellar. The surface reconstruction of YMnO3@Ag2S photocatalyst is of 0D/2D structure. The addition of Ag2S to YMnO3 improved the optical absorption capacity, charge migration and separation efficiency, and photocatalytic degradation capacity of the whole system. The photocatalytic degradation of rhodamine B, methyl blue and methyl orange by YMnO3@Ag2S photocatalyst showed that YMnO3@Ag2S photocatalyst had the best degradation ability for methyl orange. Photocatalytic experiments also showed that the optimal pH value was 9, the optimal dye concentration was 40 mg/L and the optimal catalyst load was 3 g/L. The high photocatalytic activity of YMnO3@Ag2S photocatalyst is mainly caused by the action of hydroxyl radical, hole and superoxide radical.