| KI改性黏土脱除烟气中单质汞的研究 |
| 摘要点击 1592 全文点击 1286 投稿时间：2013-12-14 修订日期：2014-02-25 |
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| 中文关键词 单质汞 碘化钾 改性黏土 吸附 脱除效率 |
| 英文关键词 elemental mercury KI modified clay adsorption removal efficiency |
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| 中文摘要 |
| 卤素改性材料对烟气中单质汞的去除具有较高的效率，黏土（膨润土）在我国分布广，资源丰富且廉价易得. 为探究KI改性黏土对烟气中单质汞的脱除效率，以浸渍法制得了KI改性膨润土，研究了不同KI负载量、 不同吸附温度及不同烟气氛围下，改性膨润土对Hg0的脱除效率和累积吸附量，并与原始膨润土进行对比. 运用比表面分析（BET）、 傅里叶红外光谱仪（FTIR）及热重分析法（TGA）等方法对材料的物理化学特性进行了分析. 结果表明，KI改性大大提升膨润土对Hg0的脱除效率，并且Hg0的脱除效率随着KI负载量的加大而上升. 温度提高了吸附剂吸附Hg0的性质，吸附剂主要表现为化学吸附. O2有利于吸附剂对Hg0的吸附. SO2对吸附剂吸附Hg0有轻微的促进作用，H2O的存在对吸附剂吸附Hg0具有很强的抑制作用. |
| 英文摘要 |
| Adsorption tests of elemental mercury were carried out by using KI modified clay (bentonite) in simulated flue gas under different conditions. Brunauer-Emett-Teller measurement (BET), Fourier Transform Infraredspectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were used to analyze the physical and chemical properties of the materials. Compared with the original bentonite, Hg0 removal efficiency and Hg0 adsorption capacity were drastically improved by the KI treatment. The experiment results also indicated that temperature could enhance the property of Hg0 adsorption. Chemical adsorption was the dominant part in the process of Hg0 adsorption. O2 was a beneficial factor for Hg0 adsorption. SO2 was found to have a slight promotional effect on Hg0 adsorption. The existence of H2O exhibited a dramatic inhibitory effect on Hg0 adsorption. |
