An A₂BO₄-type oxygen-deficient perovskite (La₂CuO_4-δ, LCO), which owns a better low-temperature reducibility, more abundant oxygen vacancies (OVs) and surface oxygen species than the benchmark CuO oxide, was first applied in peroxymonosulfate (PMS) activation. At 0.7 g/L of LCO and 2 mM of PMS, more than 96 % of bisphenol A (BPA) was removed within 60 min over a wide pH range of 3.1 ‒ 9.1. The cycle of surface Cu(II)/Cu(I) redox couple and lattice oxygen (O²⁻)/O₂ were responsible for PMS activation. Besides, the OVs with localized electrons may directly activate PMS through single electron transfer pathway to generate surface-bound hydroxyl radical (OH) and sulfate radical (SO₄⁻), as well as less singlet oxygen (¹O₂) for BPA degradation. The evolution of OH, SO₄⁻ and ¹O₂ were revealed by EPR tests. Briefly, this study provides the mechanistic understanding of A₂BO₄-type perovskite in activation of PMS for water treatment.

首先是A ₂ BO ₄型缺氧钙钛矿（La ₂ CuO4 _-δ，LCO），它具有比基准CuO氧化物更好的低温还原性，更丰富的氧空位（OVs）和表面氧种类。用于过一硫酸盐（PMS）活化。在0.7 g / L的LCO和2 mM的PMS下，在3.1 9.1的宽pH范围内，在60分钟内去除了96％以上的双酚A（BPA）。表面Cu（II）/ Cu（I）氧化还原对和晶格氧（O ^2-）/ O ₂的循环是PMS活化的原因。此外，具有局部电子的OVs可以通过单电子转移途径直接激活PMS，从而产生表面结合的羟基（OH）和硫酸根（SO ₄ ^- ），以及较少的单线态氧（¹ Ò ₂）为BPA降解。的演变OH，SO ₄ ^-和¹ ö ₂通过EPR试验揭示。简而言之，该研究提供了在水处理中激活PMS时A ₂ BO ₄型钙钛矿的机理。