Abstract
The CeCu oxide catalyst CC450 was prepared by citric acid complex method and the catalytic wet peroxide oxidation (CWPO) reaction system was established with bisphenol A (BPA) as the target pollutant. By means of characterization, this research investigated the phase structure, surface morphology, reducibility, surface element composition, and valence of the catalyst before and after reuse. The effects of catalyst dosage and pH on the removal efficiency of BPA were also investigated. Five reuse experiments were carried out to investigate the reusability of the catalyst. In addition, this research delved into the changes of pH value, hydroxyl radical concentration, and ultraviolet-visible spectra of BPA in CWPO reaction system. The possible intermediate products were analyzed by gas chromatography-mass spectrometry (GC-MS). The catalytic mechanism and degradation pathway were also discussed. The results showed that after reaction of 65 min, the removal of BPA and total organic carbon (TOC) could reach 87.6% and 77.9%, respectively. The catalyst showed strong pH adaptability and had high removal efficiency of BPA in the range of pH 1.6–7.9. After five reuses, the removal of BPA remained above 86.7%, with the structure of the catalyst remaining stable to a large extent. With the reaction proceeding, the pH value of the reaction solution increased, the concentration of OH radicals decreased, and the ultraviolet-visible spectrum of BPA shifted to the short wavelength direction, that is, the blue shift direction. The catalysts degraded BPA rapidly in CWPO reaction system and the C–C bond or O–H bond in BPA could be destroyed in a very short time. Also, there may have been two main degradation paths of phenol and ketone.
Highlights
Bisphenol A (BPA) is one of the highest production-volume chemicals in the world
The concentrations of Cu2+ and Ce4+ measured in this experiment were greater than 1ppm; this method can be used to detect the concentration of ions in solution, which can meet the accuracy requirements
BPAremoval removalwas between the two periods, which indicated that the dosage of catalyst indicating that the influence of these factors was secondary and negligible under the condition of had a relatively large impact on bisphenol A (BPA) removal
Summary
Bisphenol A (BPA) is one of the highest production-volume chemicals in the world. The global production of BPA reached 8 million metric tons in 2016 and is expected to reach 10.6 million metric tons by 2022 [1]. A variety of methods including physical, biological, and chemical methods have been developed to degrade BPA in aqueous solution, for example, adsorption [10,11], biological degradation [8,12] and photocatalysis [13,14], ozonation [15], ultrasonication [16,17], electrocatalytic oxidation [18], Fenton and Fenton-like processes [19], and catalytic wet air oxidation [20] Physical methods such as activated carbon adsorption can transfer pollutants from one medium to another, yet still pose a potential threat to the environment.
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