Composite structure and enhanced photocatalytic activity in Mn–Co–Ni–O/LaMnO₃ microparticles

Abstract

A series of Mn-Co-Ni-O/LaMnO 3 composite materials were synthesized through the sol-gel method. The structure of these powders changed from the spinel to a spinel-perovskite mixed phase as the content of LaMnO 3 increased from 0 to 50%. Meanwhile, some grains of composite material were refined to form many small particles and distributed among the porous microparticles. According to the absorption spectra of composite samples, the strong absorption structures appeared in visible ranges, especially between 400 and 730 nm. The photocatalytic degradation of tetracycline under the visible light irradiation indicated that the percentage of LaMnO 3 at 50% exhibited the highest degradation rate (70.2%) in 150 min. Its high photocatalytic activity was mainly due to the large surface area, strong visible light absorption and increased ratio of Mn 3+ /Mn 4+ ions. These new micro-structured photocatalysts were expected to show considerable potential applications in the water treatment.

Fe/Ni redox synergistic sodium persulfate photocatalytic depolymerization of the sinocalamus oldhami alkali lignin for the directional synthesis of aromatic aldehydes

“…The binding energies of 833.28 ~ 838.58 eV and 850.38 ~ 855.28 eV in Fig. 2b were belonged to La 3d5/2 and La 3d3/2, respectively [14]. Main splitting peaks of samples re ected the ability of electronic mobility from O 2p orbital to an empty La 4f orbital, forming the extent of La-O shared electrons [15].…”