Application of nanoscale CeO2 as Fenton-like catalyst in the field of environment and bioscience

Abstract

Fenton reaction has been regarded as one of the most potent ways to cost-efficiently degrade organic contaminants and cure cancer by inducing cell apoptosis and necrosis. However, commercial Fe-base catalysts and natural enzymes are suffering from high costs and low durability. Exploring a new catalyst for reducing cost and avoiding secondary pollution is demanding. Recent research illustrates that CeO₂ owns a specific oxygen vacancy structure and Ce³⁺/Ce⁴⁺ redox cycle, which is thought to be the origin of Fenton-like reaction activities. Significantly, inducing heteroatoms promotes the concentration of oxygen vacancy and Ce³⁺ ions, and the electrons transfer between Ce and heteroatoms accelerates the redox cycles. The broad reaction pH value and low biotoxicity endow CeO₂ with enormous potential in organic pollutants’ disposal and artificial enzyme for healthcare. Because of their excellent stability, Ce-base catalysts are more accessible for storage and transformation than natural enzymes. Meanwhile, electro-/photochemistry technologies are believed to reduce subsequent pollution and potentially be applied in biology fields. This review focuses on the Fenton-like reaction process and its application in environmental engineering and life science.