碳量子点/碘酸氧铋光催化条件下沉积物中不同形态汞的迁移转化机理

Mercury(Hg) in the sediment of wetland can transmit along the food chain, whose potential effect on food safety and human health can not be ignored. On the basis of our previous research, the electronic reduction properties of carbon quantum dots (CQDs) modified BiOIO₃ is used to explore the behavior mechanism and reduction efficiency of different form of divalent inorganic mercury and methyl mercury(MeHg) under simulated solar light irradiation, the transport and transformation and trapping technology of elemental mercury at water-sediment are also discussed. This subject is expected to provide the theoretical basis and technical support for remediation of Hg contamination in sediment by photocatalysis technology. It is significative of this subject to control the detrimental effect of heavy metal in sediment on ecological environment and human wellbeing.

湿地沉积物中的Hg沿食物链的传递对于食品安全和人类健康的潜在影响不容忽视，寻求科学的、有效的修复方法迫在眉睫。本项目拟在我们前期研究的基础上，尝试利用高效CQDs/BiOIO₃ 光催化剂的电子还原特性，探究光催化条件下沉积物中各形态二价汞、MeHg的行为机制和还原效能，并追踪零价汞在水-沉积物界面的迁移特征与捕获技术，以期为光催化技术修复沉积物中Hg污染提供理论依据和技术支持。此项目的探索将对有效控制沉积物中重金属对生态环境与人类造成的不利影响有着非常积极的意义。

湿地沉积物中的Hg沿食物链的传递对于食品安全和人类健康的潜在影响不容忽视，寻求科学的、有效的修复方法迫在眉睫。本项目主要研究了（1）铋基复合光催化剂的制备、合成、表征及催化活性研究；（2）不同形态汞在沉积物/土壤-水环境中的再补给、扩散及生物有效性；（3）湖泊中典型溶解有机质对Hg(II)光还原和生物利用度的影响；（4）溶解性有机物（DOM）对生物炭处理土壤中Hg植物有效性的影响；（5）稻田环境中典型有机质介导的Hg(II)光还原研究；（6）溶解氧对水稻土中甲基汞生成和细菌群落的影响。研究结果能为光催化技术修复沉积物中Hg污染提供一定的理论依据和技术支持。