Synthesis of nanosized MgMn2O4 spinel by co-precipitation in the ultrasonic field

Nanosized MgMn2O4 spinel particles were synthesized by co-precipitation in an ultrasonic field. It was found that the Bragg peaks on the diffractogram of the synthesized product were in good agreement with the reference model of MgMn2O4 spinel with a tetragonal structure. According to the Debye–Scherrer equation, the average size of the MgMn2O4 crystallite was calculated, which was ~24 nm. Nanosized spinel particles were tested as sodium percarbonate activators during the oxidative degradation of the xanthene dye rhodamine B (advanced oxidation – ultrasound/MgMn2O4/Na2CO3×1.5 H2O2). It was estab­lished that at the sodium percarbonate concentration of 5 mM, the catalyst content in the reaction medium of 1 g/l, and the treatment time of 3600 s, the degradation degree of rhodamine B was 98%, and the rate constant was – 4.1×10–3 s–1.