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

College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China

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 (n_Co/n_Eu) 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 C₂O₄^2- 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.
- Lewis acid,
- Co₃O₄,
- heterogeneous catalysis,
- peroxymonosulfate,
- methylene blue
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Co3O4 Doped with Europium as a Performance Enhanced Heterogeneous Catalyst to Activate Peroxymonosulfate for Degradation of Methylene Blue

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通讯作者: 陈斌, bchen63@163.com

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