ABO₃-type perovskite oxides with abounding defect structures and diverse physical chemistry attributes have been extensively studied in heterogeneous catalysis. Semiconductor LaFeO₃ perovskites fabricated via the sol–gel method were used as peroxydisulfate (PDS) activators for methylene blue (MB) degradation under low-intensity ultra-violet (UV)-light to evaluate the degradation efficiency of organic pollutants and mechanism. The results indicate that under low-intensity UV irradiation, the developed UV/LaFeO₃/PDS system shows excellent degradation ability of organic pollutants in a wide pH range. Electron spin resonance and radical quenching experiments verify that SO₄^·−, •OH, h⁺ and ¹O₂ are generated during the activation process, and ¹O₂ plays a dominant role in MB degradation. Reduction of low oxidation state Fe(II) and O₂²⁻/O⁻ on the LaFeO₃ surface shows that oxygen vacancy, as the electron transfer mediator, enhances the redox cycle efficiency of Fe(II)/Fe(III). Photogenerated electrons of LaFeO₃ involved in the cyclic transformation of Fe(II)/Fe(III) and PDS activation further increase the number of active radicals and thus promote the synergistic effect of photocatalytic coupled with sulfate radical-based advanced oxidation processes.

ABO ₃型钙钛矿氧化物具有丰富的缺陷结构和多种物理化学属性，已在多相催化中得到广泛研究。采用溶胶-凝胶法制备的半导体 LaFeO ₃钙钛矿作为过二硫酸盐 (PDS) 活化剂在低强度紫外 (UV) 光下降解亚甲蓝 (MB) 以评估有机污染物的降解效率和机理。结果表明，在低强度紫外线照射下，所开发的UV/LaFeO ₃ /PDS体系在较宽的pH范围内表现出优异的有机污染物降解能力。电子自旋共振和自由基猝灭实验验证了 SO ₄ ^·-、·OH、h ⁺和¹ O ₂在活化过程中产生，¹ O ₂在MB降解中起主导作用。LaFeO ₃表面上低氧化态Fe(II)和O ₂ ^2- /O ^-的还原表明氧空位作为电子转移介质提高了Fe(II)/Fe(III)的氧化还原循环效率。参与 Fe(II)/Fe(III) 循环转化和 PDS 活化的 LaFeO ₃的光生电子进一步增加了活性自由基的数量，从而促进了光催化与硫酸根基高级氧化过程的协同效应。