CeO2 and CeO2-based nanomaterials for photocatalytic, antioxidant and antimicrobial activities

• Published in: Journal of rare earths Vol. 41; no. 2; pp. 167 - 181
• Main Authors: Matussin, Shaidatul Najihah, Harunsani, Mohammad Hilni, Khan, Mohammad Mansoob
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2023
• Subjects: Biological applications; Ce3+/Ce4; Environmental applications; Oxygen deficient CeO2; Oxygen vacancies; Rare earths; Oxygen deficient CeO2; Oxygen vacancies; Ce3+/Ce4; Environmental applications; Rare earths; Biological applications
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/j.jre.2022.09.003

Cerium oxide (CeO2), one of the most significant rare-earth oxides, has attracted considerable interest over the past decades. This is primarily due to the ease in Ce3+/Ce4+ redox ability as well as other factors that affect the efficacy of CeO2 and CeO2-based materials. CeO2 and CeO2-based materials have shown enhanced responses in catalytic and photocatalytic activities for environmental and biological applications. In addition, the formation of Ce3+ and oxygen vacancies in CeO2 has aided in enhancing CeO2 activities. In order to produce oxygen-deficient CeO2 and CeO2-based materials, a variety of synthesis methods were used and are highlighted in this review. Therefore, this review compiles and discusses the mechanisms that involve oxygen vacancies, defects, and Ce3+ formation for environmental applications, such as photocatalytic dye degradation, photocatalytic CO2 reduction, and non-colored pollutants removal. The biological applications of CeO2, such as antioxidant enzyme mimetic, antioxidant reactive oxygen species/reactive nitrogen species, and antimicrobial activities, are also discussed. Additionally, future prospects are also suggested for future development and detailed investigations. Enhanced response of the CeO2 and CeO2-based materials for photocatalytic, antioxidant, and antimicrobial activities owing to the redox ability, formation of Ce3+, and oxygen vacancies. [Display omitted] •Syntheses of CeO2, doped-CeO2, and CeO2 composites.•Synergistic formation of Ce3+ and oxygen vacancies in CeO2.•CeO2-based nanomaterials for photocatalytic applications.•CeO2-based nanomaterials for environmental applications.•CeO2-based nanomaterials for biological applications.