Photocatalytic Activity of Bi2O3 Enhanced by the Addition of Ce3+/Ce4+ Synthesized by Ethylene Glycol‐assisted Solvothermal Method. Issue 19 (20th May 2020)

• Record Type: Journal Article
• Authors: Li, Ting; Quan, Shanyu; Shi, Xuefeng; Liu, Cong; Yang, Linmei
• Is Part Of: ChemistrySelect. Volume 5:Issue 19(2020)
• Page Start: 5799
• Page End: 5808
• Publication Date: 2020-05-20
• Subjects: Bi2O3 -- Ce3+/Ce4+ redox pair -- Oxygen species -- One-pot solvothermal synthesis -- Photocatalytic activity; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202000951
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The photocatalysts Bi2 O3 :Ce 3+ /Ce 4+ (cerium content 0.2, 0.5, 0.8, and 1.1 wt. %) were prepared via one‐pot ethylene glycol‐assisted solvothermal method. The prepared x Ce‐Bi2 O3 (x =0.5, 0.8, 1.1) samples present δ‐Bi2 O3 phase with space group of Fm‐3 m at room temperature, which indicates that the high‐temperature cubic phase could be stabilized via Ce doping in Bi2 O3 lattices. Moreover, the addition of Ce 3+ /Ce 4+ could change the amount of oxygen vacancies (OVs) and adsorbed oxygen on the surface of photocatalysts. The existence of oxygen vacancies and adsorbed oxygen facilitated the generation of superoxide radicals () and hydroxide radicals (), which were the dominant reactive oxygen species for phenol degradation. The photocatalyst containing 0.8 wt. % cerium presented the highest photoactivity than the other synthesized samples. A photodegradation mechanism is proposed based on scavenger and electron spin resonance studies. Abstract : The photocatalysts Bi2 O3 :Ce 3+ /Ce 4+ were synthesized by one‐pot ethylene glycol‐assisted solvothermal method. The addition of Ce 3+ /Ce 4+ to Bi2 O3 improves its photocatalytic performance for phenol degradation. The ceria ion pair Ce 3+ /Ce 4+ acts as a trap to capture an electron, avoiding the recombination with other chemical species adsorbed on the surface of Bi2 O3. The doping enhances the formation of / radical, which played a fatal role in the degradation of phenol.