Enhanced remediation of actual dye wastewater by hydrogenated bimetallic MOF derivative with active peracetic acid
Shengmei Tan, Liuwei Zhang, Zhiliang Cheng, Yuxin Peng, Jinshan Tang, Hongrui Zhu, Facheng Qiu
Abstract
This study introduces a hydrogenated FeCo-MOF derivative catalyst (HC-FeCo@C350) to activate peracetic acid (PAA) for efficient degradation dye wastewater. Rhodamine B (RhB) as a model pollutant, the HC-FeCo@C350/PAA achieved a 99.33% removal efficiency within 20 min, with a rate constant 18 times higher than the non-hydrogenated system. Liquid chromatography-mass spectrometry (LC-MS) and the toxicity evaluation software (T.E.S.T.) confirmed reduced intermediate toxicity. Quenching experiments, electron paramagnetic resonance (EPR) tests, and density functional theory (DFT) calculation show that HC-FeCo@C350 can effectively activate PAA to produce 1O2, CH3C(O)O•, and CH3C(O)OO•. The magnetically recoverable catalyst maintained over 80% efficiency after 4 cycles. In actual dye wastewater treatment, the RE of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total nitrogen (TN), total phosphorus (TP) could reach approximately 53.57%, 53.23%, 29.25%, 19.2%, respectively, with reduced toxicity validated by mungbean germination experiment. This technology offers a promising approach for refractory dye wastewater treatment and reuse.