间接电还原净水过程的原子氢产生与作用机制

项目名称： 间接电还原净水过程的原子氢产生与作用机制

项目编号： No.51478455

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 兰华春

作者单位： 中国科学院生态环境研究中心

项目金额： 88万元

中文摘要： 在间接电还原净水过程中，原子氢（H*）是污染物催化还原的重要活性物种，而如何检测H*和提高H*产量及利用效率是研究间接电还原机制的核心问题。其难点是：如何建立适用于电极微界面H*表达的原位分析方法，怎样构造一种具有低析氢过电位、利于H*产生和传递的新型催化电极。为此，本项目拟以贵金属Pd为主催化剂，贵金属Ag、Re、In或Pt为辅助催化剂，将这些金属沉积在负载石墨烯的碳基材料上，制备一种可通过间接电还原高效产H*的新型功能性电极；并建立适用于间接电还原体系的H*表达方法。从结构和形态上表征产H*电极的物理化学特征，解析有特征污染物的去除途径，揭示间接电还原催化作用机制，提出基于间接电还原产H*反应过程的净水原理。

中文关键词： 间接电还原；原子氢；电极；催化；机制

英文摘要： Atomic hydrogen (H*) is an important active radical during the indirect electro-reduction water purification process. How to detect the H* and enhance its production and efficiency for pollutants removal represents a core problem for understanding the indirect electro-reduction mechanism. The difficulty lies in: how to establish an analytical method suitable for in situ detection of H*, and how to prepare a new catalytic electrode that has a low hydrogen-evolution overpotential and can produce and transmit H* effectively. For this purpose, this project aims to prepare a new functional electrode by depositing Pd, which acts as the primary catalyst, and Ag, Re, In or Pt, which acts as the auxiliary catalyst, on the graphene-doped carbon electrode by use of an electrodeposition method. And establish a suitable analytical method for detection of H* in indirect electro-reduction system. The prepared catalytic electrode will be characterized for its structure and morphology, and then used to degrade some model pollutants in aqueous solution. This study is expected to clarify the catalytic mechanism of the H* produced from indirect electro-reduction, and on this basis, further propose its relevant water purification principles.

英文关键词： Indirect electro-reduction;Atomic hydrogen;Electrode;Catalysis;Mechanism