Interface engineered perovskite oxides for enhanced catalytic oxidation: The vital role of lattice oxygen

Abstract

Abstract Advanced oxidation processes are effective ways to eliminate retardant organic pollutants in water. The perovskite oxides, a class of superior catalysts, can effectively activate high-energy material, e.g. peroxymonosulfate, to generate active oxygen species for quickly mineralizing organics. Herein, with the nominal composition of LaxNiO3 (x\xa0=\xa01.15 and 1.2), nanocomposites composed of LaNiO3 Single-perovskite and La2NiO4 Ruddlesden–Popper are developed through a facile one-pot synthesis. Compared to LaNiO3, more oxygen vacancies and reactive oxygen species were thus generated for La1.15NiO3 and La1.15NiO3 exhibits the highest catalytic activity and an excellent stability for contaminants degradation. The performance improvement is mainly attributed to the participation of lattice oxygen, the transformation of oxygen ions and considerable oxygen vacancies. They stimulate the 1O2 formation in La1.15NiO3 as the main active oxidant. The optimization of perovskites by interface engineering opens a new venue to design efficient catalysts for advanced oxidation processes in environmental treatment.