芳香性共轭碳氮聚合物水凝胶光催化产生水合电子及其还原水中含氧酸盐的研究

水合电子（eaq−）是目前已知活性最强的还原性物种之一，产生eaq−的方法主要有紫外光激发、电子束辐照等，均需要较高能耗且量子产率较低。为了有效利用可持续再生的太阳能，本项目拟构建芳香性共轭碳氮聚合物水凝胶光催化体系，在太阳光照射下提高eaq−的产率，并将其用于水中高氯酸盐、溴酸盐、硝酸盐等有毒含氧酸盐的还原处理。研究不同结构特性的芳香性共轭碳氮聚合物水凝胶的制备方法，探索碳氮聚合物与芳香性化合物之间的电子转移途径，明确光催化促进芳香性共轭碳氮聚合物水凝胶产生eaq−的机制；研究eaq−还原水中含氧酸盐的效率、反应路径以及还原产物的选择性，阐明eaq−还原水中含氧酸盐的机制。本研究不仅为水中含氧酸盐类污染物的处理提供一个新的解决思路，而且通过探索材料特性与eaq−产率的关联性，可为开发基于eaq−的新型高级还原技术提供有益指导。

As one of the most active reductive species, hydrated electrons (eaq−) can be formed by ultraviolet light excitation and electron beam irradiation promotion, which requires high energy consumption and has low quantum yield. In order to effectively use sustainable and renewable solar energy, the aromatic conjugated carbonitride polymer hydrogels are employed for promoting the generation of eaq− under irradiation of solar light, which can reduce the perchlorate, bromate, nitrate and other oxysalt pollutants in water. Synthesis methods of aromatic conjugated carbonitride polymers hydrogels will be investigated and electron transfer pathways between carbonitride polymers and aromatic compounds will be studied. Also, the generation mechanism of eaq− promoted by photocatalysis on aromatic conjugated carbonitride polymer will be explored. The reduction efficiency, the reaction path and the selectivity of final reduction product of oxysalt will be determined. In addition, the mechanism of oxysalt pollutants reduction by eaq− will be clarified. The present study will not only provide a novel solution for the removal of oxysalt pollutant in water, but also offer a useful guidance for the development of advanced reduction processes based on eaq− by exploring the relationship between material properties and eaq− yield.