文摘
A series of nanosized (Fe3-xMnx)1-未O4 (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-未O4 can provide the active sites for elemental mercury adsorption, and Mn4+ cations on (Fe3-xMnx)1-未O4 may be the oxidizing agents for elemental mercury oxidization. With the increase of Mn content in the spinel structure, the percents of Mn4+ cations and cation vacancies on the surface increased. As a result, elemental mercury capture by (Fe3-xMnx)1-未O4 was obviously promoted with the increase of Mn content. (Fe2.2Mn0.8)1-未O4 showed an excellent capacity for elemental mercury capture (>1.5 mg g鈭? at 100鈭?00 掳C) in the presence of SO2 and HCl. Furthermore, (Fe2.2Mn0.8)1-未O4 with the saturation magnetization of 45.6 emu g鈭? 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-未O4 may be a promising sorbent for the control of elemental mercury emission.