Removal of elemental mercury by KI-impregnated clay

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• 作者：Boxiong Shen ; Jianhong Chen ; Ji Cai
• 关键词：clay ; elemental mercury ; removal efficiency ; potassium iodide ; mechanism
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：10
• 期：2
• 页码：236-243
• 全文大小：205 KB
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• 作者单位：Boxiong Shen (1) (2)
  Jianhong Chen (2)
  Ji Cai (2)
  
  1. School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China
  2. College of Environmental Science & Engineering, Nankai University, Tianjin, 300071, China
  
• 刊物主题：Environment, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-221X

文摘

This study described the use of clay impregnated by KI in gas phase elemental mercury (Hgo) removal in flue gas. The effects of KI loading, temperature, O₂, SO₂ and H₂O on Hgo removal were investigated using a fixed bed reactor. The Hgo removal efficiency of KI-clay with 3% KI loading could maintain at a high level (approximately 80 %) after 3 h. The KI-clay demonstrated to be a potential adsorbent for Hgo removal when compared with activated carbon based adsorbent. O₂ was found to be an important factor in improving the Hgo removal. O₂ was demonstrated to assist the transfer of KI to I₂ on the surface of KI-clay, which could react with Hgo directly. NO and SO₂ could slightly improve Hgo removal, while H₂O inhibited it greatly. The results indicated that after adsorption, most of the mercury escaped from the surface again. Some of the mercury may have been oxidized as it left the surface. The results demonstrated that the chemical reaction primarily occurred between KI and mercury on the surface of the KI-clay. Keywords clay elemental mercury removal efficiency potassium iodide mechanism