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A Ce 0.86 Cu 0.14– x  O 2  catalyst was prepared by the citric acid complex method and characterized by X-ray diffraction, scanning electron microscopy, and temperature-programmed reduction, and its activity in the catalytic wet peroxide oxidation of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) was investigated. The results showed that the Cu 2+  ions dissolved into the CeO 2  lattice to form a Ce 0.86 Cu 0.14– x  O 2  solid solution with a coarse, interconnected, porous, and cotton-like morphology. The metal–oxygen bonds were weakened by solid-solution formation in the Ce 0.86 Cu 0.14– x  O 2  catalyst. This weakening facilitated H 2 O 2  activation and decomposition to form highly oxidative HO ∙  species that can lead to significant chlorophenol mineralization. A total organic carbon removal rate greater than 80% was achieved after 2 h reaction at 50°C and at an initial 4-CP and 2,4-DCP concentration of 50 mg/L. The effects of H 2 O 2  dosage, catalyst dosage, and initial chlorophenol concentration on catalytic efficiency were also determined.

Catalytic Wet Peroxide Oxidation of Chlorophenol Over a Ce 0.86 Cu 0.14– x O 2 Catalyst