WANGHao-yu,GAOShi,ZHANGDa-yi,et al.Effect of Fe3+/Fe2+ on Catalytic Fenton Reaction and Recycling Performance of MNPs[J].China Water & Wastewater,2023,39(21):104-110.
Effect of Fe3+/Fe2+ on Catalytic Fenton Reaction and Recycling Performance of MNPs
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第21期
Page:
104-110
Column:
Date of publication:
2023-11-01
- Abstract:
- Magnetic nanoparticles (MNPs) catalyzed Fenton-like reaction has been widely applied in degrading organic compounds. However, there are few studies on the difference between the catalytic performance and magnetic recovery performance of magnetic nanoparticles under different Fe3+/Fe2+ ratios (molar ratio). In this study, three kinds of MNPs with different Fe3+/Fe2+ ratios were synthesized by co-precipitation method, and then were used as catalysts to degrade ethidium bromide (EtBr) in a Fenton-like system. The effects of pH, catalyst dosage and H2O2 dosage on the catalytic efficiency of the system were analyzed, and the reuse performance of the three MNPs was discussed. pH had a significant effect on the catalytic efficiency of the system (p<0.05), and EtBr was also degraded to a certain extent under alkaline conditions (degradation rate was 38.48%). MNPs with Fe3+/Fe2+ ratio of 2∶1(MNPs?A) had the best comprehensive performance. Under the optimal conditions (pH of 3, MNPs dosage of 0.5 g/L and H2O2 dosage of 0.05 mol/L), the degradation rate of EtBr reached 98.97% within 4 h, and the degradation process conformed to the first-order kinetics (k=1.143 9 h-1, r2=0.998 7). The MNPs?A still maintained a catalytic efficiency of 65.49% after five recovery cycles.
Last Update:
2023-11-01