1. Long-acting CoAl2O4 spinel catalyst developed on activated alumina pellets by facile synthesis to activate peroxymonosulfate: Controllable cobalt leaching and environmental adaptability.
- Author
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Zhou, Muyang, Liu, Kun, Peng, Qian, Jiang, Kun, Tang, Xuekun, Zhang, Yingjie, and Xing, Jiajie
- Subjects
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COBALT , *PEROXYMONOSULFATE , *FIXED bed reactors , *ALUMINUM oxide , *LEACHING , *SPINEL , *SPINEL group - Abstract
A novel composite catalyst prepared by fixing cobalt aluminate (CoAl 2 O 4) spinel on formed alumina carrier by impregnation-calcination route is reported, which can be used to efficiently activate peroxymonosulfate (PMS) to degrade p-nitrophenol (PNP). The internal laws of phase composition and preparation conditions are explored in detail, and the results show that the introduction of additional aluminum ions in the preparation process changes the coordination environment and the electronic state of cobalt ions, which leads to the transformation of spinel/inverted spinel in the composition, and further affects the activity and stability of the catalyst. The selected CoAl-Aaps-600 catalyst has high CoAl 2 O 4 content, showing good cycle performance and low cobalt leaching, and has great catalytic degradation performance at different temperatures and a wide pH range. Most notably, a fixed bed reactor packed with 20 g of CoAl-Aaps-600 exhibits excellent capacity to continuously treat 60 L of PNP solution with acceptable PNP removal ratio and low cobalt leaching content. Sulfate radical and singlet oxygen are identified as the main reactive oxygen species produced in CoAl-Aaps-600/PMS system, and the reaction mechanism is reasonably inferred. This work provides a potential application material and process for the treatment of continuous organic wastewater. [Display omitted] • CoAl 2 O 4 spinel is anchored on activated alumina pellets to activate PMS. • Occupying the octahedrons by aluminum ions is the crux to control the phase composition. • The catalyst has low cobalt leaching and high stability. • The continuous-flow reaction shows the long-term effectiveness of the catalyst. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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