会议名称：2023世界木材日研讨会暨第五届国际林联（IUFRO）林产品文化研究组讨论会
会议时间：2023年3月22日

报告嘉宾：Seung-Hwan Lee
嘉宾简介：韩国江原大学森林与环境科学学院 教授

摘要：
Nanozymes, known as nanomaterials characteristic with enzyme-mimicking properties, have been widely explored in various applications. In contrast to natural enzymes, nanozymes exhibit a multitude of unique merits, such as ease of synthesis, low cost, high stability and high versatility. Numerous nanomaterials, including carbon, metal, metal-organic frameworks, and metal oxide nanoparticles have been identified as enzyme mimics. Among them, particularly, carbon and metal nanozymes have attracted considerable attention in enzyme-mimicking applications because of their unique optical, electrical, and catalytic capabilities. The most common drawback of these nanozymes is colloidal aggregation, poor recoverability and reusability, which are essential attributes of a catalyst. Hence, immobilizing these ultra-small nanozymes on a polymeric support is a promising approach to overcome these difficulties. As a sustainable natural polymer, nanocellulose can function best as a support for the immobilization, because of its renowned properties, such as a large surface area, biodegradability, and abundant surface functionalities. Moreover, it can be easy to make various morphological structures because of its structural flexibility.
In our research, we have first immobilized the peroxidase mimicking Fe-doped carbon dots (FeCDs) on 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNF) via physical entrapment and prepared a nanopaper. The nanopaper was applied for the smartphone based colorimetric detection of H2O2 and glucose. In other approach, peroxidase mimicking Fe, N-doped carbon dots (FeNCDs) were immobilized on dialdehyde CNF (DACNF) via Schiff base reaction and reductive amination. As prepared film strips were applied for colorimetric detection of H2O2 and cholesterol. In another work, Pd nanoparticles (PdNPs) were in-situ grown on pure CNF (PCNF) via microwave method. As prepared PdNPs/PCNF exhibited excellent peroxidase and oxidase mimicking properties. Further film and foams were prepared and explored for dye degradation. As a whole, immobilization on CNF prevented these carbon and metal nanozymes from aggregation, offered easy recovery and excellent reusability.

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