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Xie X, Wang J, Guo X, Sun J, Wang X, Duo Wu W, Wu L, Wu Z. Comparative study on CeO 2 catalysts with different morphologies and exposed facets for catalytic ozonation: performance, key factor and mechanism insight. J Colloid Interface Sci 2024; 673:847-859. [PMID: 38908284 DOI: 10.1016/j.jcis.2024.06.119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 06/11/2024] [Accepted: 06/15/2024] [Indexed: 06/24/2024]
Abstract
Morphology and facet effects of metal oxides in heterogeneous catalytic ozonation (HCO) are attracting increasing interests. In this paper, the different HCO performances for degradation and mineralization of phenol of seven ceria (CeO2) catalysts, including four with different morphologies (nanorod, nanocube, nanooctahedron and nanopolyhedron) and three with the same nanorod morphology but different exposed facets, are comparatively studied. CeO2 nanorods with (110) and (100) facets exposed show the best performance, much better than that of single ozonation, while CeO2 nanocubes and nanooctahedra show performances close to single ozonation. The underlying reason for their different HCO performances is revealed using various experimental and density functional theory (DFT) calculation results and the possible catalytic reaction mechanism is proposed. The oxygen vacancy (OV) is found to be pivotal for the HCO performance of the different CeO2 catalysts regardless of their morphology or exposed facet. A linear correlation is discerned between the rate of catalytic decomposition of dissolved ozone (O3) and the density of Frenkel-type OV. DFT calculations and in-situ spectroscopic studies ascertain that the existence of OV can boost O3 activation on both the hydroxyl (OH) and Ce sites of CeO2. Conversely, various facets without OV exhibit similar O3 adsorption energies. The OH group plays an important role in activating O3 to produce hydroxyl radical (∙OH) for improved mineralization. This work may offer valuable insights for designing Facet- and OV-regulated catalysts in HCO for the abatement of refractory organic pollutants.
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Affiliation(s)
- Xianglin Xie
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Jiaren Wang
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Xingchen Guo
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Jinqiang Sun
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Xiaoning Wang
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Winston Duo Wu
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
| | - Lei Wu
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, PR China.
| | - Zhangxiong Wu
- Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China; Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China.
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Yao Z, Xu S, Zhang X, Zhu J, Liao P, Yuan J, Rong C, Liu X, Xiong Z, Kang S, Kuang F. Co/CeO 2/C composites derived from bimetallic metal-organic frameworks for efficient microwave absorption. Dalton Trans 2023; 52:12632-12645. [PMID: 37615584 DOI: 10.1039/d3dt02036c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Abstract
CeO2, an n-type semiconductor material, has been widely used in microwave absorption (MA) due to its unique structural features such as oxygen vacancies and interstitial atoms. In this paper, Co/CeO2/C composites were prepared by a hydrothermal method followed by a pyrolysis process. The effect of different pyrolysis temperatures (650-950 °C) on the MA property of the composites was investigated. When the pyrolysis temperature was 850 °C, the Co/CeO2/C-850 composite exhibited outstanding MA behavior in the frequency range of 2-18 GHz, displaying a minimum reflection loss (RLmin) of -45.22 dB and an effective absorption bandwidth (EAB) of 4.61 GHz at a thin thickness of 1.75 mm. The MA performance of the Co/CeO2/C composites is mainly attributed to the dielectric loss due to interfacial polarization originating from different interfaces and dipole polarization caused by the oxygen vacancies in CeO2. In addition, the introduction of Co nanoparticles not only provides the magnetic loss but also modulates impendence matching for the current magnetoelectric coupling system.
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Affiliation(s)
- Zhiqian Yao
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Suqiong Xu
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Xianke Zhang
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Jiawei Zhu
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Peng Liao
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Jujun Yuan
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Chuicai Rong
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Xiaoqing Liu
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Zuzhou Xiong
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Shuying Kang
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
| | - Fangguang Kuang
- School of Physics and Electronics, Gannan Normal University, Ganzhou 341000, China.
- Advanced Energy Storage and Photoelectric Materials Research Center, Gannan Normal University, Ganzhou 341000, China
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