School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240 PR China.
Environ Sci Technol. 2011 Feb 15;45(4):1540-6. doi: 10.1021/es103391w. Epub 2011 Jan 5.
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.
一系列纳米级（Fe3-xMnx）1-δO4（x = 0、0.2、0.5 和 0.8）被合成用于从烟道气中捕获元素汞。（Fe3-xMnx）1-δO4 上的阳离子空位可以提供元素汞吸附的活性位，并且（Fe3-xMnx）1-δO4 上的 Mn(4+)阳离子可能是元素汞氧化的氧化剂。随着尖晶石结构中 Mn 含量的增加，表面上的 Mn(4+)阳离子和阳离子空位的百分比增加。因此，随着 Mn 含量的增加，（Fe3-xMnx）1-δO4 对元素汞的捕获明显得到促进。在 SO2 和 HCl 的存在下，（Fe2.2Mn0.8）1-δO4 对元素汞的捕获具有优异的能力（在 100-300°C 下>1.5mg g(-1)）。此外，具有 45.6 emu g(-1)饱和磁化强度的（Fe2.2Mn0.8）1-δO4 可以通过磁分离从飞灰中分离出来，使飞灰基本上不含吸附剂和吸附的 Hg。因此，纳米级（Fe2.2Mn0.8）1-δO4 可能是一种有前途的控制元素汞排放的吸附剂。
