Citation: Qiang XIA, Xiao-Gang LIAO, Hai-Li SHEN, Lin ZHENG, Gang LI, Tian TIAN. Co₃O₄ with Different Morphologies: Synthesis and Performances in Activating Peroxymonosulfate for Methylene Blue Degradation[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(11): 2191-2201. doi: 10.11862/CJIC.2022.221 shu

Co₃O₄ with Different Morphologies: Synthesis and Performances in Activating Peroxymonosulfate for Methylene Blue Degradation

Qiang XIA ¹ ,
Xiao-Gang LIAO ¹ ,
Hai-Li SHEN ¹ ,
Lin ZHENG ¹ ,
Gang LI ^1,, ,
Tian TIAN ^{1, 2}

1.
College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
2.
52 Institute of China North Industries Group, Baotou, Inner Mongolia 014000, China

Corresponding author: Gang LI, ligang2015@cqut.edu.cn
Received Date: 12 April 2022
Revised Date: 6 September 2022

Figures(10)

Three methods (urea hydrothermal-calcination, chemical bath deposition-calcination, and oxalate pyrolysis) were used to prepare Co₃O₄ powder materials with different morphologies, which were named Co₃O₄-A, Co₃O₄-B, and Co₃O₄-C, respectively. All of them were taken as catalysts to activate peroxymonosulfate (PMS) for the degradation of methylene blue (MB). It is found that these Co₃O₄ materials were quite different in their catalytic performance. Under the assistance of Co₃O₄-A, Co₃O₄-B, and Co₃O₄-C, the PMS decomposition reaction rate constants were measured as 0.047 1, 0.217 4, and 0.003 7 min^-1, while the degradation ratios of MB were 91.25% (reaction time: 50 min), 100.00% (reaction time: 25 min), and 31.55% (reaction time: 50 min), respectively. That is, Co₃O₄-B had the best catalytic performance. To make clear the difference in the catalytic ability of Co₃O₄, a series of characterizations were carried out. It is discovered that these Co₃O₄ materials are different in many ways such as crystallinity, microstructure, specific surface area, surface oxygen vacancy concentration, and surface hydroxyl density. And it is confirmed that the primary factor influencing the catalytic performance of Co₃O₄ is the surface hydroxyl density. In addition, the optimized parameters for MB degradation in the Co₃O₄-B/PMS reaction system were determined as follows: reaction temperature 25 ℃, catalyst dosage 0.02 g·L^-1, and PMS dosage 0.6 mmol·L^-1, where the MB degradation ratio was as high as 98.33%. Moreover, the reactive oxygen species ·SO₄^-, ·OH, ·O₂^- and ¹O₂ were all detected in the Co₃O₄-B/PMS system according to the quenching experiments and electron paramagnetic resonance tests, and sulfate radicals were identified as the primary reactive oxygen species.
- advanced oxidation processes,
- Co₃O₄,
- peroxymonosulfate,
- surface hydroxyl,
- methylene blue
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沈阳化工大学材料科学与工程学院沈阳 110142

Co3O4 with Different Morphologies: Synthesis and Performances in Activating Peroxymonosulfate for Methylene Blue Degradation

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通讯作者: 陈斌, bchen63@163.com

Co₃O₄ with Different Morphologies: Synthesis and Performances in Activating Peroxymonosulfate for Methylene Blue Degradation