Ag3PO4/Cu-BiVO4 p-n异质结的制备及其增强可见光催化降解四环素性能

利用水热和原位沉淀法将Ag₃PO₄纳米颗粒负载于Cu²⁺掺杂的单斜相BiVO₄微球上成功制备了Ag₃PO₄/Cu-BiVO₄异质结构, 并作为可见光下高效降解四环素(TC)的光催化剂.通过XRD、SEM、TEM、XPS、FTIR、UV-Vis DRS、PL和EIS等手段对样品进行了表征.结果表明, Cu²⁺和Ag₃PO₄纳米颗粒的修饰增加了比表面积和可见光响应性能, 为催化反应提供更多的异质结界面活性点位.铋(Bi)/银(Ag)物质的量比为2:1的Ag₃PO₄/Cu-BiVO₄催化剂在120min内对TC (20mg/L)显示出最高的光催化性能(91.68%), 5次连续循环后降解率保持86.1%, 表现出优异的光催化活性和稳定性.结合捕获实验和电子自旋共振(ESR)光谱证实h⁺和·O₂^-为主要活性物种.光催化活性的增强主要归因于Cu-BiVO₄和Ag₃PO₄间p-n异质结构的形成和Cu²⁺掺杂的能带调控作用, 有效提高了光催化反应过程中载流子的分离和迁移效率.

Synthesis of Ag3PO4/Cu-BiVO4 p-n heterojunction and enhancement of its visible-light photocatalytic degradation of tetracycline

The Ag₃PO₄/Cu-BiVO₄ heterostructure was successfully synthesized using hydrothermal and in-situ precipitation methods to load Ag₃PO₄ nanoparticles onto the Cu²⁺ doped monoclinic BiVO₄ microspheres, and was used as the photocatalyst for the efficient degradation of tetracycline (TC) under the visible light. Materials characterization was carried out. The techniques such as SEM, TEM, XPS, FTIR, UV-Vis DRS and EIS were applied to characterize the samples. Our results showed that Cu²⁺ modification and Ag₃PO₄ nanoparticles increased the specific surface area and visible light response performance, which could provide more active sites on the heterojunction interface. Ag₃PO₄/Cu-BiVO₄with Bi/Ag at 2:1 ratio demonstrated the highest photocatalytic removal performance (91.68%) of TC (20mg/L) within 120min, and the degradation rate remained at about 86.1% for a five-consecutive cycle. h⁺ and ·O₂^- were experimentally confirmed to be the main active species. The enhanced photocatalytic activity could be mainly attributed to the formation of p-n heterojunction between Cu-BiVO₄ and Ag₃PO₄ and the band regulation of Cu²⁺ doping, which could effectively improve the separation and migration efficiency of photogenerated carriers during the photocatalytic reaction.