Citation: Qiang XIA, Xiao‐Gang LIAO, Hai‐Li SHEN, Lin ZHENG, Gang LI, Jun SHEN. Co3O4 Doped with Europium as a Performance Enhanced Heterogeneous Catalyst to Activate Peroxymonosulfate for Degradation of Methylene Blue[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(8): 1567-1576. doi: 10.11862/CJIC.2022.163 shu

Co3O4 Doped with Europium as a Performance Enhanced Heterogeneous Catalyst to Activate Peroxymonosulfate for Degradation of Methylene Blue

  • Corresponding author: Gang LI, ligang2015@cqut.edu.cn
  • Received Date: 1 April 2022
    Revised Date: 8 June 2022

Figures(7)

  • Employing Co(NO3)2 and Eu(NO3)3 as raw materials, a series of porous Co/Eu bimetallic ‐oxide catalysts were synthesized through an oxalate‐pyrolysis method, and their catalytic performances in activating peroxymonosulfate (PMS) for degradation of methylene blue (MB) were evaluated. The results showed that the sample with a Co/Eu molar ratio (nCo/nEu) of 9 (Co9Eu1) exhibited the most excellent catalytic property towards PMS decomposition for MB removal. The degradation ratio of MB was 86.66% in the system of Co9Eu1/PMS, while it was only 52.62% for the counterpart, under the reaction conditions: catalyst addition of 0.10 g·L-1, PMS concentration of 0.6 mmol·L-1, and a reaction temperature of 25 ℃. The outstanding catalytic performance of Co9Eu1 is attributed to the electron ‐ deficient property of Eu3+, which can enhance the polarization of PMS adsorbed on the surface of the catalyst and then make PMS easier to be activated by the primary catalytic component of Co3O4. Meanwhile, it is found that both C2O42- and HCO3- anions have obvious inhibitory effects on the degradation efficiency of MB in the Co9Eu1/PMS reaction system. In addition, quenching experiments and electron paramagnetic resonance spectroscopies (EPR) identify that reactive oxygen species (SO4-·, ·OH and ·O2-) and non‐radical reactive oxygen species (1O2) both exist in the reaction system. Among them, SO4-· plays a key role in MB oxidative degradation process. Furthermore, no significant changes in catalytic performance in four consecutive cycles was observed.
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