燃煤烟气汞是汞污染的重要来源，常规活性炭吸附脱汞成本昂贵，农作物秸秆制备的生物炭脱汞受到广泛关注，之前研究主要采用物理或化学改性技术提高生物炭脱汞性能，而等离子体也是一种高效的改性技术。本项目拟对等离子体改性生物炭脱除烟气汞的性能和机理进行研究。首先从生物炭成分、微观形貌、热稳定性、孔隙结构和化学官能团等多角度探索等离子体对生物炭的改性机制。再分析改性生物炭吸附脱汞的性能及机理，根据汞的升温脱附特性研究汞的质量平衡及吸附形态，并对比分析反应前后生物炭表面的微观形貌、孔隙结构和化学官能团等微观特性，建立实验变量与生物炭微观特性参数的定量关系，再结合吸附动力学和等温线模型，探索等离子体改性生物炭脱汞机理。最后，结合改性机制和脱汞机理，分析等离子体改性对生物炭脱汞的促进机制。本项目旨在获得等离子体改性促进生物炭脱汞的影响规律及机理，为等离子体改性生物炭脱汞提供理论指导。

Mmercury in coal-fired flue gas is an important source of mercury pollution, conventional activated carbon de-mercury is expensive, the removal of mercury by biochar from crop straw has been paid more and more attention, previous studies have mainly used physical or chemical modification technology to improve the mercury removal performance of biochar, while the plasma is also an efficient modification technology. The project will focus on study the performance and mechanism of mercury removal from flue gas by plasma-modified biochar. Firstly, the mechanism of biochar modified by plasma will be studied from the aspects of biochar composition, microscopic morphology, thermal stability, pore structure and chemical functional groups. Secondly, the performance and mechanism of mercury removal by modified biochar will be determined, the mass balance of mercury and mercury compounds will be discussed by the temperature programmed desorption of mercury, the pore structure and chemical functional groups of biochar surface will be analyzed before and after reaction, and relations between the experimental variables and microscopic characteristic parameter of biochar will be established, to explore the mechanism of mercury removal by modified biochar combined with isotherm and kinetic models. Finally, Combining the modification mechanism and the mechanism of mercury removal, the promotion mechanism of plasma modification on mercury removal by biochar will be determined. this project aims at obtaining the influence and promotion mechanism of plasma modification on mercury removal by biochar, and providing theoretical guidance for removal of mercury by plasma-modified biochar.