Abstract
This study proposes a novel LaCoO(3‑δ)/H(2)O(2) Fenton-like process for the efficient generation of nonradical singlet oxygen ((1)O(2)) and hydroxyl radicals ((•)OH), enabling the deep oxidation of nitric oxide (NO), as well as simultaneous denitrification and desulfurization. A LaCoO(3‑δ) perovskite material enriched with Co(3+) ions and oxygen vacancies (OV) was successfully synthesized by using a one-step citric acid sol-gel method. OV enhances electron mobility and expedites the redox cycling of surface Co(2+)/Co(3+) pairs, thereby promoting the generation of (•)OH and (•)O(2) (-). The high Co(3+) content further facilitates the transformation of (•)O(2) (-) into (1)O(2). Moreover, electron-rich centers and highly reactive lattice oxygen (O(2-)) induced by abundant OV also contribute to the activation of H(2)O(2), enhancing the production of (•)OH and (1)O(2). When combined with a comprehensive Na(2)SO(3)/NaOH absorption system, simultaneous removal efficiencies of 91.2% for NO and 100% for SO(2) were achieved under optimal experimental conditions while ensuring good operational stability. This innovative noniron-based Fenton-like system not only rivals the performance of typical iron-based Fenton-like systems but also provides new insights into the development of multipollutant deep oxidation removal technologies for application in coal-fired power plants.