Hierarchical Regulation of LaMnO(3 )Dual-Pathway Strategy for Excellent Room-Temperature Organocatalytic Oxidation Performance

The performance-enhancing strategy of a singlepathway for perovskite has been widely studied. In this work, thedual-pathway strategy of A-site Ce substitution and nitric acidselective dissolution was proposed. The catalytic oxidationperformance of LaMnO3exhibits the characteristic of hierarchicalregulation, that is, a steplike improvement, which avoids thelimitation of performance improvement of the single pathway. TheB-site Mn with catalytic activity was in situ reconstituted on thesurface to build a Mn-rich surface. The obtained sdLa0.7Ce0.3MnO3has the advantages of good oxygen mobility, high Mn4+/Mn3+molar ratio, and large specific surface area, and this materialshowed excellent catalytic oxidation performance for organics,which can realize colorimetric chemical oxygen demand detectionat room temperature. Here, Ce substitution improved the oxidation capacity by improving the oxygen mobility and the ratio ofMn4+/Mn3+, and further nitric acid treatment not only accelerated the in situ reconstruction of B-site Mn but also increased thespecific surface area