Understanding oxygen-deficient La2CuO4-δperovskite activated peroxymonosulfate for bisphenol A degradation: The role of localized electron within oxygen vacancy

By Hanxiao Chen, Xu Yin, Kangmeng Zhu, Hui Zhang. 2021

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Abstract An A2BO4-type oxygen-deficient perovskite (La2CuO4-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.

Subfields: Mechanical Engineering, Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/885439e906ad907efafdca4b142208650f55726a