新型生物光电还原体系的构建及其降解机理研究

Exoelectrogens have distinctive application in the bioremediation of organic pollutants due to its non-specific reduction ability. However, the electron energy released by exoelectrogens is not high enough to reduce some environmental organic pollutants. Thus, this project intends to combine exoelectrogens with visible light responsive photocatalysts to establish a novel bio-photoelectric reductive degradation system. Electrons released by exoelectrogenic bacteria are transferred to nanomaterials and then its energy is improved by photoexcitation to reduce refractory organic pollutants efficiently. The optimization of operating parameters are conducted by synthesis and characterization of nanomaterials, the electron transfer mechanism and the biocompatibility of nanomaterials. Additionally, the degradation mechanism is elucidated by molecular biology, microbiology and analytical chemistry. This project may improve nonspecific reduction capacity of exoelectrogens and is beneficial for promoting their application in environmental bioremediation.

产电微生物因其特有的非特异性还原降解能力而在有机污染物的生物修复中得到广泛应用。但是产电微生物所释放的电子能量较低的缺陷严重制约了其对很多污染物的降解能力。本课题拟采用将产电微生物和可见光响应型光催化材料相结合，将产电微生物代谢生成的电子传递给纳米材料，利用可见光激发将电子的能量提高，从而建立新型的"生物光电"降解体系，实现对有机污染物的高效还原降解。根据这一理论设计，本项目从可见光催化纳米材料的合成表征、产电微生物电子传递机制、以及纳米材料的生物相容性三个方面入手，通过优化自行设计的小型厌氧可见光还原降解装置的运行参数实现对有机废水的高效降解，并结合分子生物学、微生物学、分析化学等多种方法，解析生物电子传递机制和化学降解过程，阐释生物光电还原降解机理。本项目的顺利开展将能显著增强产电微生物的降解能力，扩展其在环境修复中的应用范围，具有重要的学术价值和良好的应用前景。