Gaseous Elemental Mercury Capture from Flue Gas Using Magnetic Nanosized (Fe3-xMnx)1-未O4

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• 作者：Shijian Yang ; Naiqiang Yan ; Yongfu Guo ; Daqing Wu ; Hongping He ; Zan Qu ; Jianfeng Li ; Qin Zhou ; Jingping Jia
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：February 15, 2011
• 年：2011
• 卷：45
• 期：4
• 页码：1540-1546
• 全文大小：841K
• 年卷期：v.45,no.4(February 15, 2011)
• ISSN：1520-5851

文摘

A series of nanosized (Fe_3-xMn_x)_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 (Fe_3-xMn_x)_1-未O₄ can provide the active sites for elemental mercury adsorption, and Mn⁴⁺ cations on (Fe_3-xMn_x)_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 (Fe_3-xMn_x)_1-未O₄ was obviously promoted with the increase of Mn content. (Fe_2.2Mn_0.8)_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, (Fe_2.2Mn_0.8)_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 (Fe_2.2Mn_0.8)_1-未O₄ may be a promising sorbent for the control of elemental mercury emission.