Novel Fe3O4@α-MnO2 activated peroxymonosulfate degradation of azo dyes in aqueous solution
DONG Zheng-yu1,2, WU Li-ying1,2, WANG Ji1,2, HUANG Wan1,2, ZHANG Qian1,2, HONG Jun-ming1,2
1. Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China;
2. Fujian Province Engineering Research Center of Industrial Wastewater Biochemical Treatment, Huaqiao University, Xiamen 361021, China
The degradation of reactive black 5, an azo dye, in aqueous solutions was investigated using novel magnetic nano-Fe3O4@α-MnO2catalyst, which prepared by two step hydrothermal method. The catalyst was characterized by transmission electron microscope (TEM), X-ray diffraction (XRD) and vibration sample magnetometer (VSM). TEM and XRD results of as-synthesized catalyst showed the nano-α-MnO2 coated Fe3O4 was successfully prepared. VSM indicated the saturation magnetization of nano-Fe3O4@α-MnO2 was reach up to 39.89emu/g. As all the Fe3O4, α-MnO2 and nano-Fe3O4@α-MnO2 was applied to assess the individual and interaction effects of metals, the higher catalytic efficiency of nano-Fe3O4@α-MnO2 implied the synergistic effect between Fe and Mn. Several operating parameters (catalyst dosage, PMS concentration and initial pH value) on the treatment efficiency and reaction kinetics of RBK5were also studied. As results, the RBK5degradation process via Fe3O4@α-MnO2 activated PMS is consistent with the pseudo-first-order reaction. The degradation efficiency of RBK5 (30mg/L) could reach 91% within 60min under the condition of the catalyst dosage was 1.2g/L, the PMS concentration was 4mmol/L, and the initial pH value was 7.0. Under this situation, the degradation rate constant of RBK5also reached the highest value of 0.023min-1. Moreover, the main active species in RBK5degradation in Fe3O4@α-MnO2/PMS system was identified as SO4-· by adding radical quencher such as methanol, tert-butanol and nitrobenzene.
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