Oxidative Modifications of Cellulose: Methods, Mechanisms, and Emerging Applications

Cellulose, a naturally occurring biopolymer, is gaining significant attention due to its versatility, abundance, and potential for sustainable applications. This paper reviews the oxidative modifications of cellulose, focusing on methods, mechanisms, and emerging applications. Oxidation introduces new functional groups into the cellulose chain, enhancing its properties for various industrial, biomedical, and environmental applications. The review categorizes oxidation into selective and nonselective processes, detailing mechanisms such as TEMPO-mediated oxidation, periodate oxidation, and the use of non-persistent nitroxyl radicals. Selective oxidation targets specific hydroxyl groups, improving properties like hydrophilicity and mechanical strength, while nonselective oxidation involves agents like nitrogen oxides and peroxides, resulting in a broader range of functional groups. The paper highlights the environmental implications of these processes, emphasizing the need for efficient water management and emission control. Advanced applications of oxidized cellulose include its use in water treatment, biomedical materials, and sustainable packaging. The review underscores the importance of optimizing oxidation techniques to enhance efficiency, reduce by-products, and achieve greater control over chemical modifications. Future research directions include exploring novel oxidants, developing environmentally benign procedures, and investigating the potential of oxidized cellulose in emerging technologies.