Interfacial engineering of [Bi2O2]2+-layer structures at Bi2O2S/Bi12TiO20 heterojunctions for enhanced photocatalytic degradation of 2, 4-dichlorophenol

Photocatalytic technology provided an environmentally friendly, green simple and efficient method to treat the pollutant. Interfacial interaction in heterojunction systems has significant effect on photocatalytic activity due to the large discrepancy in lattice parameters. In this work, the [Bi2O2]2+-containing materials was used to construct an Bi2O2S/Bi12TiO20 (BOS/BTO) heterojunction via in-situ growth, and characterized by various ap-proaches to analyze their structural, photoelectrochemical and optical properties. The BOS/BTO composite showed excellent visible light photodegradation of 2, 4-dichlorophenol (2, 4-DCP). Among, the optimal BOS/ BTO composite exhibited the removal rates of 2, 4-DCP were 3.5 times and 1.6 times higher than pure BTO and BOS. Meanwhile, the density functional theory (DFT) calculations, GC/MS test and a series of experimental results confirmed the type-I photocatalytic mechanism and possible degradation pathway. This work offered a novel ideal for designing heterojunction photocatalyst with enhanced photocatalytic activity via the interfacial engineering of [Bi2O2]2+-layer structures.