Abstract
CeCu solid solution oxide catalysts were prepared by the complex method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS). And its activity in the catalytic wet peroxide oxidation (CWPO) of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) in water was investigated. The results showed that the Cu2+ ions dissolved into the CeO2 lattice to form CeCu solid solution oxide with a coarse, interconnected, porous, and cotton-like morphology. The metal-oxygen bonds were weakened by the formation of solid solution in the CeCu oxide catalyst. This weakening facilitated the activation and decomposition of the H2O2 to form highly oxidative HO· species that can lead to significant chlorophenol mineralization. The formation of CeCu solid solution oxide can effectively inhibit the Cu ions to be leached from the used CeCu oxide catalysts, which can ensure the CeCu oxide catalysts to adapt to a wide pH range of 2.1–7.9 and exhibit good reusability. CWPO reaction of 4-CP and 2,4-DCP molecules on CeCu oxide catalysts conforms to the first-order kinetic equation: y = 6959.3x − 17.2 and y = 9725x − 25.4, respectively. And the reaction activation energies are 57.8 and 80.8 kJ/mol, respectively. The TOC removals of 4-CP and 2,4-DCP can exceed 88 and 82%, and the dechlorination rates of 4-CP and 2,4-DCP are higher than 95 and 99.5%, respectively.









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Funding
This research is funded by Chongqing Research Program of Basic Research and Frontier Technology (cstc2019jcyj-msxmX0293) and Research Foundation of Chongqing Technology and Business University (No. 1952017).
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Xie, H., Zeng, J. & Zhou, G. CeCu composite oxide for chlorophenol effective removal by heterogeneous catalytic wet peroxide oxidation. Environ Sci Pollut Res 27, 846–860 (2020). https://doi.org/10.1007/s11356-019-07042-5
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DOI: https://doi.org/10.1007/s11356-019-07042-5


