大学化学 >> 2023, Vol. 38 >> Issue (5): 234-240.doi: 10.3866/PKU.DXHX202207059

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固酶纳米复合物光电催化性能评估的综合实验——多学科交叉综合性实验教学改革实践

杜虹, 张咪, 曾涵()   

  • 收稿日期:2022-07-13 录用日期:2022-10-07 发布日期:2022-11-23
  • 通讯作者: 曾涵 E-mail:zenghan1289@163.com

Comprehensive Experiment of Evaluating the Photoelectrocatalytic Eerformance of the Enzyme Nanocomposite: Reform and Practice of Multidisciplinary Comprehensive Experiment

Hong Du, Mi Zhang, Han Zeng()   

  • Received:2022-07-13 Accepted:2022-10-07 Published:2022-11-23
  • Contact: Han Zeng E-mail:zenghan1289@163.com

摘要:

针对现有固酶二氧化钛-碳纳米材料复合物基光电化学传感器存在的环境适应性和抗干扰性欠佳、灵敏度和底物选择性不够高以及构效关系研究不足等问题,系统探讨了不同功能单元与二氧化钛/碳基纳米材料之间各种相互作用与纳米复合物各基元结构、组成以及理化性质之间的关联。在此基础上确定制约其传感效能和应用价值的关键因素,阐述了未来构筑此类传感器构效关系模型所需解决的重点问题。本文设计了一个典型的综合性实验,介绍了固载牛血红蛋白的二氧化钛纳米球-3D氧化石墨烯共价偶联复合物基电极的制备方法。使学生掌握综合运用多种表征测试技术考察固载酶分子与载体各基元间相互作用对酶参与光电催化反应各相关步骤动力学的影响的方法,并了解固酶电极光电催化动力学参数测定的相关理论和方法。

关键词: 二氧化钛, 碳纳米材料, 光电化学传感器, 综合性实验, 催化动力学

Abstract:

Regarding the current photo-electrochemical sensor on the basis of TiO2-carbon nano-material composite with enzyme incorporation, defects such as unfavorable environmental adaptability, undesirable anti-interference capability, inferior sensitivity, unsatisfactory substrate selectivity and insufficient efforts on the constitution-function relationship study are identified. The dependence of the interactions between the variable functional units within nano-complex and TiO2/carbon nano-material on the structure, composition as well as physicochemical properties of the elements in nano-composite is systematically discussed. Efforts are made to define the key factor to restrict the sensing efficiency and applications of as-prepared photo-electrochemical sensor. The critical issue for the constructing the constitution-performance relationship model to develop the next generation photo-electrochemical sensor is elucidated. A classical comprehensive experiment is designed and presented. The method for preparing the electrode on the basis of nano-composite via the covalent coupling of TiO2 nanosphere with 3D graphene oxide, and hemoglobin incorporation is introduced. The implementation of this experiment is aimed at the training of the students to use multiple techniques. Such characterization and measurement techniques can be proposed to explore the influence of the interactions between elements in nano-complex and incorporated enzyme molecules on the dynamics of relevant steps involved in the enzyme based photo-electrocatalytic reaction. The experimental set up is proposed to make the students understand and master the interrelated theory and means to determine the kinetic parameters of photo-electrocatalysis for enzyme-based electrode. The idea of closely integrating theory with practice, rigorous and realistic scientific attitude for the educational object could be developed with the execution of the comprehensive experiment.

Key words: Titanium dioxide, Carbon nano-materials, Photo-electrochemical sensor, Comprehensive experiment, Catalytic dynamics