Heterojunction formation and morphology control have always been regarded as effective ways to improve the performance of visible-light-driven photocatalysts. In this study, a new facile strategy was applied to synthesize the Z-scheme GO/AgI/Bi₂O₃ heterojunction, where polyvinyl pyrrolidone (PVP) and γ-methacryloxypropyl trimethoxy silane (KH-570) were used to modulate the morphologies. Methyl orange and tetracycline hydrochloride were chosen as target contaminants to evaluate the photocatalytic properties of samples and the results revealed that 2% GO/AgI/Bi₂O₃ exhibited the best photocatalytic performance under visible-light irradiation. The enhanced photocatalytic activity can mainly attribute to Z-scheme heterojunction formed by the deposing of AgI and GO as well as the sufficient heterogeneous interfaces resulted from the improved morphology, which have effectively promoted the separation and transfer of electron-hole pairs. To deeply realize the enhanced performance of GO/AgI/Bi₂O₃ photocatalysts, the reaction kinetics, trapping experiments and photocatalytic mechanism were deduced.

异质结的形成和形态控制一直被认为是改善可见光驱动光催化剂性能的有效方法。在这项研究中，采用了一种新的简便策略来合成Z方案GO / AgI / Bi ₂ O ₃异质结，其中聚乙烯吡咯烷酮（PVP）和γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH-570）用于调节形态。选择甲基橙和盐酸四环素作为目标污染物，评估样品的光催化性能，结果表明，GO / AgI / Bi ₂ O _3为2％在可见光照射下表现出最好的光催化性能。增强的光催化活性主要归因于AgI和GO沉积形成的Z型异质结，以及由于形态改善而产生的足够多的非均质界面，有效地促进了电子-空穴对的分离和转移。为了深入认识GO / AgI / Bi ₂ O ₃光催化剂的性能提高，推导了反应动力学，诱捕实验和光催化机理。