H₂O₂ decomposition catalyzed by strontium cobaltites and their application in Rhodamine B degradation in aqueous medium

The catalytic activities of three topotactic phase strontium cobaltites (SCO, hexagonal, orthorhombic and tetragonal) for H₂O₂ decomposition were studied. All they present excellent catalytic activity with good stability at cycled test, and the mesoporous tetragonal SCO exhibits the best activity. Detailed kinetic research indicates the zero-order process of H₂O₂ decomposition. Increasing the temperature will accelerate the reactions greatly with the controlled temperature in the range of 20–45 °C. The calculated active energy (E_a) for H-SCO, O-SCO and T-SCO is 93.2, 85.1 and 87.5 (kJ/mol), respectively. The efficient catalytic degradation of Rhodamine B illustrates that SCO is a kind of promising catalysis for the advanced oxidation process.