Perovskite oxides, with an ABO₃ general formula, have attracted much attention as effective peroxymonosulfate (PMS) activators because of their composition adjustability and chemical stability. A doping strategy has been applied to enhance the PMS activation capability with the modulation of the crystal structure of the parent LaCoO_3-δ perovskite by substituting Co atoms located at the B-site, with high valence state transition metals. Herein, a series of LaCo_1-xMo_xO_3-δ perovskites were prepared with different Mo content, showing a phase transformation from rhombohedral to cubic-like structures. LaCo_0.95Mo_0.05O_3-δ compound is located at the so-called morphotropic phase boundary (MPB) boosting PMS activation performance as well as enhanced stability. The presence of local inhomogeneities, observed as oxygen vacancies, has been detected in the MPB region enhancing the catalytic effect of pollutant degradation. Mo doping induced Co reduction that contributed to the enhanced PMS activation. Sulfate radical was identified to be the dominating reactive specie for LaCo_1-xMo_xO_3-δ catalyzed PMS activation. This work contributes first, to clarifying the role of Mo doping to boost PMS activation, and second to highlighting the crucial role of the reduced oxidation state as well as the oxygen vacancies in the MPB for PMS activation. Impressive results were obtained when LaCo_0.95Mo_0.05O_3-δ compound was deposited in a Lab-grade photoreactor with LED technology, reaching a complete removal of paracetamol in the first minute. This study provided new insight into the rational design of PMS activator and developed a new strategy for heterogeneous active PMS at a photoreactor with immobilized catalysts.

具有ABO ₃通式的钙钛矿氧化物由于其成分可调节性和化学稳定性而作为有效的过氧单硫酸盐（PMS）活化剂而备受关注。通过用高价态过渡金属取代位于 B 位的 Co 原子来调节母体 LaCoO _3-δ钙钛矿的晶体结构，已应用掺杂策略来增强 PMS 活化能力。在此，制备了一系列不同Mo含量的LaCo _1-x Mo _x O _3-δ钙钛矿，显示出从菱面体结构到立方结构的相变。LaCo _0.95 Mo _0.05 O _3-δ化合物位于所谓的变态相界 (MPB) 提高 PMS 活化性能以及增强稳定性。已在 MPB 区域检测到局部不均匀性的存在，即氧空位，从而增强了污染物降解的催化作用。Mo 掺杂诱导 Co 还原，这有助于增强 PMS 活化。硫酸根被确定为 LaCo _1-x Mo _x O _3-δ催化 PMS 活化的主要活性物质。这项工作首先有助于阐明 Mo 掺杂对促进 PMS 活化的作用，其次是强调还原氧化态以及 MPB 中的氧空位对 PMS 活化的关键作用。当 LaCo 获得了令人印象深刻的结果_0.95 Mo _0.05 O _3-δ化合物被沉积在具有LED技术的实验室级光反应器中，在第一分钟内完全去除了扑热息痛。该研究为 PMS 活化剂的合理设计提供了新的见解，并为在具有固定化催化剂的光反应器中的非均相活性 PMS 开发了一种新策略。