氧化改性活性炭吸附脱除游离态汞

煤是一种主要化石能源，燃煤烟气中汞排放引起的污染现已达到严重危害人类健康的程度，主要原因是其中的游离态汞（Hg^0）由于低熔点、高平衡蒸气压以及低水溶性而难以由传统的烟气净化装置中去除。燃煤烟气中汞的治理势在必行。本文在研究国内外含汞废气治理技术的基础上，对活性炭分别进行了浓HNO3和H2O2氧化改性，研究其对游离态汞的吸附效率和吸附等温线。结果表明，改性后的活性炭对汞的吸附能力明显增强。

Performance of Elemental Mercury Adsorption by Modified Activated Carbon and Possible Precautions

Coal is one of main energy sources, and mercury emission in coal-fired flue gases becomes a great environ- mental concern as it has caused harm to human health. The problem is particularly severe for elemental mercury (HgO) in vapor, it cannot be effectively removed by using current air pollution control devices due to its low melting point, high equilibrium vapor pressure and low solubility in water. So it is necessary to take some measures to remove elemental mercury from fiue gas ef- fectively. Based on the investigation of domestic and foreign technologies of removing HgO, this research uses HNO3 and H2O2 to modify the activated carbon and studies its removal efficiency and isothermal curve of free mercury. Result indicates that the adsorption capacity of modified ACs increases obviously.