Preparation of nickel-doped iron-based bimetallic organic framework carbonized derivatives for heterogeneous catalytic hydrogen peroxide degradation of 4-NP

A nickel-doped iron-bimetallic organic framework carbon-derived material (Fe-Ni-MOF@C) was successfully constructed by microwave-pyrolysis and used as a new non-homogeneous Fenton-like catalyst for the catalytic degradation of p-nitrophenol (4-NP) by hydrogen peroxide (H2O2). Several characterization results such as SEM and XRD show that Fe-Ni-MOF@C is successfully synthesized and has porous, strong stability and magnetic properties. Fe-Ni-MOF@C materials exhibit excellent catalytic performance for the degradation over a wide temperature (15-45°C) and pH (3.00-9.00). Complete removal of 4-NP (30 mg/L) was achieved in 30 min at 25°C and pH=3. The material properties can be restored by calcination. According to the radical burst experiments, electron paramagnetic resonance spectroscopy (EPR) combined with the characterization results, the radicals acting in the Fe-Ni-MOF@C/H2O2 system are mainly •OH and, to a lesser extent, •O2−. The synergistic effect between Fe and Ni species accelerates electron transfer and radical generation, which is the reason for the material's high catalytic performance. High-performance liquid chromatography coupled with mass spectrometry (HPLC-MS) was used to analyze the main degradation products and pathways. This study demonstrates that bimetallic organic framework carbon-derived materials with synergistic effects have great application prospects as non-homogeneous Fenton-like catalysts in the field of H2O2 oxidation of organic pollutants.