Gaseous elemental mercury capture from flue gas using magnetic nanosized (Fe3-xMnx)1-δO4.
Gaseous elemental mercury capture from flue gas using magnetic nanosized (Fe3-xMnx)1-δO4.
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DOI：
10.1021/es103391w
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发表时间：
2011-01
影响因子：
11.4
通讯作者：
Shijian Yang;N. Yan;Yongfu Guo;Daqing Wu;Hongping He;Zan Qu;Jianfeng Li;Qin Zhou;Jingpin Jia-Jingp
中科院分区：
文献类型：
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作者：
Shijian Yang;N. Yan;Yongfu Guo;Daqing Wu;Hongping He;Zan Qu;Jianfeng Li;Qin Zhou;Jingpin Jia-Jingp
合成了一系列纳米（Fe3-xMnx）1-δO4 (x = 0,0.2, 0.5和0.8)，用于从烟气中捕集元素汞。（Fe3-xMnx）1-δO4上的阳离子空位可以为单质汞吸附提供活性位点，（Fe3-xMnx）1-δO4上的Mn（4+）阳离子可能是单质汞氧化的氧化剂。随着尖晶石结构中Mn含量的增加，表面Mn（4+）阳离子的百分比和阳离子空位增加。结果表明，随着Mn含量的增加，（Fe3-xMnx）1-δO4对元素汞的捕获明显加快。在SO2和HCl存在下，（Fe2.2Mn0.8）1-δO4表现出良好的元素汞捕获能力（>1.5 mg g(-1)，温度100-300℃）。磁化强度为45.6 emu g（-1）的（Fe2.2Mn0.8）1-δO4可以从粉煤灰中分离出来，使粉煤灰基本不含吸附剂和汞，因此纳米级（Fe2.2Mn0.8）1-δO4可能是一种很有前景的控制单质汞排放的吸附剂。
A series of nanosized (Fe3-xMnx)1-δO4 (x = 0, 0.2, 0.5, and 0.8) were synthesized for elemental mercury capture from the flue gas. Cation vacancies on (Fe3-xMnx)1-δO4 can provide the active sites for elemental mercury adsorption, and Mn(4+) cations on (Fe3-xMnx)1-δO4 may be the oxidizing agents for elemental mercury oxidization. With the increase of Mn content in the spinel structure, the percents of Mn(4+) cations and cation vacancies on the surface increased. As a result, elemental mercury capture by (Fe3-xMnx)1-δO4 was obviously promoted with the increase of Mn content. (Fe2.2Mn0.8)1-δO4 showed an excellent capacity for elemental mercury capture (>1.5 mg g(-1) at 100-300 °C) in the presence of SO2 and HCl. Furthermore, (Fe2.2Mn0.8)1-δO4 with the saturation magnetization of 45.6 emu g(-1) can be separated from the fly ash using magnetic separation, leaving the fly ash essentially free of sorbent and adsorbed Hg. Therefore, nanosized (Fe2.2Mn0.8)1-δO4 may be a promising sorbent for the control of elemental mercury emission.