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2016年 第10卷 第2期

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《环境科学与工程前沿（英文）》 >> 2016年 第10卷 第2期 doi: 10.1007/s11783-014-0765-7

Removal of elemental mercury by KI-impregnated clay

1. School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.2. College of Environmental Science & Engineering, Nankai University, Tianjin 300071, China

录用日期： 2014-12-12 发布日期： 2016-02-01
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This study described the use of clay impregnated by KI in gas phase elemental mercury (Hg ) removal in flue gas. The effects of KI loading, temperature, O , SO and H O on Hg removal were investigated using a fixed bed reactor. The Hg 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 Hg removal when compared with activated carbon based adsorbent. O was found to be an important factor in improving the Hg removal. O was demonstrated to assist the transfer of KI to I on the surface of KI-clay, which could react with Hg directly. NO and SO could slightly improve Hg removal, while H O 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.

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