Fe–Mn Oxide Composite Activated Peroxydisulfate Processes for Degradation of p-Chloroaniline: The Effectiveness and the Mechanism

Abstract

The chemical co-precipitation method was used to prepare magnetically separable Fe–Mn oxide composites, and the degradation of p-chloroaniline (PCA) using MnFe2O4 activated peroxydisulfate (PDS). The MnFe2O4 catalyst exhibited highly catalytic activity in the experiments. XRD, FTIR, SEM and TEM were used to characterize the catalytic materials. MnFe2O4 calcined at 500 °C was more suitable as a catalytic material for PCA degradation. The elevated reaction temperature was beneficial to the degradation of PCA in neutral pH solution. The reaction mechanism of the MnFe2O4 catalyzed oxidative degradation of PCA by PDS was investigated by free radical quenching experiments and XPS analysis. The results showed that sulfate radicals (SO4•−), hydroxyl radicals (•OH) and singlet oxygen (1O2) may all be participated in the degradation of PCA. XPS spectra showed that the electron gain and loss of Mn2+ and Fe3+ was the main cause of free radical generation. The possible intermediates in the degradation of PCA were determined by HPLC-MS, and possible degradation pathways for the degradation of PCA by the MnFe2O4/PDS system were proposed.

Enhanced ozonation of vanillin catalyzed by highly efficient magnetic MnFe2O4/ZIF‐67 catalysts: Synergistic effects and mechanism insights

“…Compared with other metal oxide catalysts used alone (J. Chen et al, 2014;Shi et al, 2022), the composite catalysts prepared in this study with ZIF-67 as the carrier act synergistically while providing an ordered structure and increasing the dispersion of the active centers, thus significantly improving the catalytic ozonation efficiency and enhancing the pollutant degradation.…”

Review on Medical Applications of Manganese Oxide (Mn2+, Mn3+, and Mn4+) Magnetic Nanoparticles

“…Wang et al [73] reported the preparation of different crystallographic phases γ-MnO 2 , Mn 2 O 3 , and Mn 3 O 4 at different calcination temperatures. Some of the manganese-based nanocomposites prepared using the coprecipitation method are MnO x -CeO 2 [74], MnO x -ZrO 2 [75], and Fe-Mn [76]. Thus, the size and morphology of nanoparticles prepared using coprecipitation method rely on the different reaction parameters like concentration of the precursor, ratio, and proportion of the solvent, temperature, stirring duration, calcination temperature, and duration.…”

Catalytic Degradation of Tetracycline Hydrochloride by Coupled UV−Peroxydisulfate System: Efficiency, Stability and Mechanism

“…Under neutral condition, copper ferrite shows better adsorption performance, because its surface structure and active site can maintain good stability at this time. In addition, some experimental studies have also shown that copper ferrite under neutral conditions may undergo hydrogen bonding, van der Waals forces and charge transfer interactions with the adsorbent, thereby enhancing its adsorption capacity [30]. It prevents the reaction of TC on the material surface.…”