Novel preparation of ferromanganese oxide based on hyperbranched polymer for peroxymonosulfate activation as a robust catalyst for the degradation of organic pollutants

The goal of this work is to degrade different organic pollutants such as methylene blue (MB), tetracycline (TCH), and rhodamine b (RhB) as an organic contaminants via ferromanganese oxide (FeMnO3) in an aqueous medium as a catalyst to activate peroxymonosulfate (PMS). Herein, the ferromanganese oxides (FeMnO3) were synthesized via calcination of phenylene diamine methyl methacrylate hyperbranched polymer/FeMn-LDH composite (G2/FeMn-LDH). The structure and surface characterizations of the prepared FeMnO3 and G2/LDH were measured using the X-ray diffraction, FTIR, scanning electron microscope, BET, and X-ray photoelectron spectra. The FeMnO3 showed the highest efficiency among all the tested samples (98 %) after 1h. The uncalcined composite (G2/FeMn-LDH) showed close efficiency after 1h treatment in the first cycle compared with FeMnO3 but does not keep its performance in the other successive cycles due to loss of their structure. The prepared FeMnO3 showed an easily recycle advantage due to its magnetic property and stability. [Display omitted] •Preparation of ferromanganese oxide (FeMnO3) and its application in MB degradation.•Preparation of aramid hyperbranched polymer and its use as a direct agent for catalyst preparation.•The FeMnO3 exhibited high catalytic activation of peroxymonosulfate.•The degradation efficiency of MB reached to 98% after 1 h.•The prepared material showed high catalytic stability after reusability test.