Rhombic sheet iron-manganese catalyst-activating peroxymonosulfate for tetracycline degradation
ZHU Zi-qi1,2, LI Li1,2, XU Ming-jun1,2, ZHANG Qian1,2, HONG Jun-ming1,2
1. College of Chemical Engineering, Huaqiao University, Xiamen 361021, China; 2. Industrial Wastewater Treatment Engineering Research Center of Fujian Provincial, Xiamen 361021, China
Abstract:The first-attempt study used iron-manganese bimetallic catalyst derived from the Prussian blue analogues, and etched by the oxalic acid for activating peroxymonosulfate (PMS) to degrade tetracycline. According to thermogravimetric analyzer (TGA), X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), the synthesized catalyst FeMn/OA-350 owned a special rhombic shape. Apparently, combined synergy of iron and manganese and abundant active sites on the sheet structure significantly augmented the oxidation performance of tetracycline. When catalyst dosage and PMS concentration were of 0.6g/L, and 2mmol/L, the removal rate of 20mg/L tetracycline was as high as 100% within only 30 min at neutral pH. The reaction process seemed to follow the second-order kinetics (R2>0.9). The free radical quenching experiments showed that hydroxyl radical, sulfate radical, singlet oxygen and superoxide radical existed in this system and singlet oxygen was the main functional group. X-ray Photoelectron Spectroscopy (XPS) data clearly exhibited the valence states of iron and manganese elements and the synergistic interactions between Fe and Mn. It was suggested that changes of different iron and manganese valence directly promoted the activation performance of the catalyst. Meanwhile, based on the quenching experiment, XPS and LC-MS analyses, the degradation process and mechanism were first proposed.
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