Water pollution is a global environmental problem that needs to be solved urgently. Among them, visible light-assisted catalytic peroxodisulfate (PDS) activation, as an efficient advanced oxidation technology, has great potential in organic wastewater treatment. Therefore, it is crucial to develop efficient photocatalysts based on PDS activation. Here, introducing defects in ZnFe₂O₄ to construct abundant oxygen vacancies (ZFO_V) could not only promote the photocatalytic degradation of TCH, but also enhance magnetic nanoparticles-activated PDS. It was shown that the ZFO_V/PDS/vis system could degrade TCH by ∼ 65 % within 30 min, about 1.23 times greater than that of ZFO/PDS/vis system. More importantly, the degradation rate was still over 58 % after three reuse cycles and extremely low leaching of Zn and Fe were observed. The effects of pH, PDS concentration, humic acid, anions and cations on TCH degradation in the presence of ZFO_V/PDS/vis systems were also investigated in detail. Combining experimental results revealed that oxygen vacancies acted as catalytically centers which supplied abundant local electrons for the adsorbed S₂O₈²⁻ reaction to produce OH and SO₄⁻ via a single electron transfer process. Additionally, oxygen vacancies could also boost electron transfer and take part in the Fe²⁺/Fe³⁺ redox cycle. Our study might open up new avenues for designing high efficiency photocatalyst by means of surface engineering and PDS activation.

水污染是一个全球性的环境问题，亟待解决。其中，可见光辅助催化过二硫酸盐（PDS）活化作为一种​​高效的高级氧化技术，在有机废水处理中具有巨大潜力。因此，开发基于 PDS 活化的高效光催化剂至关重要。_{在这里，在ZnFe 2} O ₄中引入缺陷以构建丰富的氧空位（ZFO _V）不仅可以促进TCH的光催化降解，还可以增强磁性纳米粒子激活的PDS。结果表明，ZFO _V/PDS/vis 系统可在 30 分钟内将 TCH 降解约 65%，是 ZFO/PDS/vis 系统的 1.23 倍。更重要的是，经过三个重复使用循环后，降解率仍超过 58%，并且观察到 Zn 和 Fe 的浸出率极低。_{还详细研究了在 ZFO V} /PDS/vis 体系存在下 pH、PDS 浓度、腐殖酸、阴离子和阳离子对 TCH 降解的影响。结合实验结果表明，氧空位作为催化中心，为吸附的 S ₂ O ₈ ^2-反应生成OH 和 SO ₄ ^{-提供了丰富的局部电子。}通过单个电子转移过程。此外，氧空位还可以促进电子转移并参与Fe ²⁺ /Fe ³⁺氧化还原循环。我们的研究可能为通过表面工程和 PDS 活化设计高效光催化剂开辟新途径。