Photo-Fenton technology integrated by photocatalysis and Fenton reaction is a favorable strategy for water remediation. Nevertheless, the development of visible-light-assisted efficient and recyclable photo-Fenton catalysts still faces challenges. This study successfully constructed a novel separable Z-scheme P-g-C₃N₄/Fe₃O₄QDs/BiOI (PCN/FOQDs/BOI) heterojunction via in-situ deposition method. The results showed that the photo-Fenton degradation efficiency for tetracycline over optimal ternary catalyst reached 96.5% within 40 min at visible illumination, which was 7.1 and 9.6 times higher than its single photocatalysis and Fenton system, respectively. Moreover, PCN/FOQDs/BOI possessed excellent photo-Fenton antibacterial activity, which could completely inactivate 10⁸ CFU·mL⁻¹ of E. coli and S. aureus within 20 and 40 min, respectively. Theoretical calculation and in-situ characterization revealed that the enhanced catalysis behavior resulted from the FOQDs mediated Z-scheme electronic system, which not only facilitated photocreated carrier separation of PCN and BOI while maintaining maximum redox capacity, but also accelerated H₂O₂ activation and Fe³⁺/Fe²⁺ cycle, thus synergistically forming more active species in system. Additionally, PCN/FOQDs/BOI/Vis/H₂O₂ system displayed extensive adaptability at pH range of 3–11, removal universality for various organic pollutants and attractive magnetic separation property. This work would provide an inspiration for design of efficient and multifunctional Z-scheme photo-Fenton catalyst in water purification.

光催化和芬顿反应相结合的光芬顿技术是水体修复的有利策略。尽管如此，开发可见光辅助的高效可回收光芬顿催化剂仍然面临挑战。本研究成功构建了新型可分离的Z型PgC ₃ N ₄ /Fe ₃ O ₄QDs/BiOI (PCN/FOQDs/BOI) 异质结通过原位沉积法。结果表明，在可见光照射下，最优三元催化剂对四环素的光-Fenton 降解效率在 40 min 内达到 96.5%，分别是其单一光催化和 Fenton 体系的 7.1 和 9.6 倍。此外，PCN/FOQDs/BOI具有优异的光芬顿抗菌活性，可完全灭活10 ⁸ CFU·mL ⁻¹的大肠杆菌和金黄色葡萄球菌分别在 20 分钟和 40 分钟内。理论计算和原位表征表明，增强的催化行为是由 FOQDs 介导的 Z 型电子系统引起的，它不仅促进了 PCN 和 BOI 的光生载流子分离，同时保持最大的氧化还原能力，而且加速了 H 2 _O 2_活化和Fe ³⁺ /Fe ²⁺循环，从而协同形成体系中更多的活性物种。此外，PCN/FOQDs/BOI/Vis/H ₂ O ₂系统在 pH 值 3-11 范围内表现出广泛的适应性，对各种有机污染物的去除普遍性和吸引人的磁分离性能。该工作将为设计用于水净化的高效多功能 Z 型光芬顿催化剂提供灵感。