文献类型：期刊文献

英文题名：Turning "defect" into "effect": In-situ photocorrosion triggering plasmon enhanced photocatalytic activity of AgI/D-NH2-MIL heterojunction for oxytetracycline degradation

作者：Song, Yanyu[1];Peng, Hongjiang[2];Ding, Sijia[2];Liu, Mingtao[2];Liu, Yongdi[2]

机构：[1]Weifang Univ Sci & Technol, Sch Civil Engn, Weifang 262700, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China

年份：2026

卷号：480

外文期刊名：JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

收录：;EI(收录号：20262120768458);WOS:【SCI-EXPANDED(收录号:WOS:001780679900002)】；

基金：This study was financially supported by the National Natural Science Foundation of China (22176061, 41807340) and the Science and Technology Commission of Shanghai Municipality (21230712000) .

语种：英文

外文关键词：AgI/D-NH 2-MIL heterojunction; In-situ photocorrosion; Surface plasmon resonance; Defect engineering; Oxytetracycline degradation

摘要：The widespread occurrence of oxytetracycline (OTC) in aquatic environments necessitates the development of efficient and sustainable remediation technologies. Although AgI is a promising photocatalyst, its practical application is severely limited by the tendency to aggregate and inherent instability due to photocorrosion. In this study, an AgI/D-NH2-MIL heterojunction was successfully fabricated using a solvothermal method followed by in-situ ion precipitation. The HCl-modulated D-NH2-MIL-53(Fe) (D-NH2-MIL) provides periodically exposed Fe-O clusters that serve as ideal anchoring sites for AgI, effectively preventing nanoparticle aggregation and ensuring intimate interfacial contact. Crucially, the inherent photocorrosion of AgI is intelligently harnessed to generate in-situ metallic Ag0 nanoparticles. Herein, the "effect" mentioned in the title is explicitly defined as the synergistic combination of the surface plasmon resonance (SPR) effect, the electronic bridge effect, and the resulting photocatalytic enhancement effect. Specifically, rather than causing catalyst deactivation, the in-situ formed Ag0 acts as a highly conductive mediator to robustly facilitate the direct Z-scheme charge transfer between AgI and D-NH2-MIL, fundamentally turning the traditional material "defect" into a powerful catalytic advantage. Under simulated solar light, the degradation rate (k value) of optimized AgI/D-NH2-MIL composite for OTC is 8.8 and 4.6 times that of pristine AgI and D-NH2-MIL, respectively. Density functional theory (DFT) calculations and photoelectrochemical analysis reveal that the synergy between the internal electric field (IEF) and the SPR effect significantly narrows the bandgap, extends the light-harvesting range and accelerates charge separation. Radical quenching experiments and electron paramagnetic resonance (EPR) confirm that center dot OH and center dot O2-are the primary reactive species. Furthermore, the heterojunction demonstrates excellent recycling stability and reduced ecological toxicity for degrading OTC. This work provides a novel perspective on transforming detrimental photocorrosion into a functional advantage for designing efficient plasmonic photocatalysts in water decontamination.