三元异质结构Ag-Bi2MoO6/BiPO4光催化剂高效降解苯酚红

多组分复合体系有利于电荷的有效分离，减少电子空穴对的复合几率。通过低温液相法首次合成Ag-Bi₂MoO₆/BiPO₄三元异质结构光催化剂。利用XRD、SEM、EDX及XPS等技术对样品进行了表征。结果表明，Ag纳米粒子光照积累在Bi₂MoO₆/BiPO₄的表面，通过表面等离子共振增加对可见光的吸收，同时作为电子受体促进了光生电子的转移。Ag、BiPO₄和Bi₂MoO₆形成三元异质结构有效地抑制了光生电子空穴对的复合。Ag-Bi₂MoO₆/BiPO₄表现出优异的光催化性能，其光催化活性较BiPO₄、Bi₂MoO₆和Bi₂MoO₆/BiPO₄样品有较大提高。并且对Ag-Bi₂MoO₆/BiPO₄三元异质结构的光催化机制进行了讨论。光催化过程中反应活性物种捕获实验结果表明h⁺和O₂^·-是主要的活性基团.

Effcient Removal Phenol Red over Ternary Heterostructured Ag-Bi2MoO6/BiPO4 Composite Photocatalyst

The fabrication of multicomponent composite systems may provide bene ts in terms of charge separation and the retardation of charge pair recombination. In this work, a ternary heterostructured Ag-Bi₂MoO₆/BiPO₄ composite was fabricated through a low-temperature solution-phase route for the rst time. The XRD, SEM, EDX and XPS results indicated the prepared sample is a three-phase composite of BiPO₄, Bi₂MoO₆, and Ag. Ag nanopar-ticles were photodeposited on the surface of Bi₂MoO₆/BiPO₄ nanosheets, which not only increase visible-light absorption via the surface plasmon resonance, but also serve as good electron acceptor for facilitating quick photoexcited electron transfer. The interface between Bi₂MoO₆ and BiPO₄ facilitates the migration of photoinduced electrons from Bi₂MoO₆ to BiPO₄, which is also conductive to reduce the recombination of electron-holes. Thus, the ternary heterostructured Ag-Bi₂MoO₆/BiPO₄ composite showed signi cant photocatalytic activity, higher than pure Bi₂MoO₆, BiPO₄, and Bi₂MoO₆/BiPO₄. Moreover, the possible photocatalytic mechanism of the Ag-Bi₂MoO₆/BiPO₄ heterostructure related to the band positions of the semiconductors was also discussed. In addition, the quenching effects of di erent scavengers revealed that the reactive ·OH and O₂^·- play a major role in the phenol red decolorization.