Effect of Manganese Ions on the Structure of Ca(OH)2 and Mercury Adsorption Performance of Mnx+/Ca(OH)2 Composites
Effect of Manganese Ions on the Structure of Ca(OH)2 and Mercury Adsorption Performance of Mnx+/Ca(OH)2 Composites
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DOI：
10.1021/ef200113t
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发表时间：
2011-04-01
期刊：
影响因子：
5.3
通讯作者：
Duan, Yufeng
中科院分区：
文献类型：
--
作者：
Wang, Yunjun;Duan, Yufeng
研究了一种钙基吸附剂对气态汞的吸附性能，以期制备出更有效的吸附剂来控制单质汞的排放。采用BET比表面积、SEM、EDX、XRD、XPS等表面分析方法对Ca（OH）（2）和Mn ~（x+）掺杂Ca（OH）（2）进行了表征。XPS分析揭示了汞的吸附特性。结果表明，Mnx+/Ca（OH）2对汞的去除率略高于Ca（OH）2。从汞的形态分析可知，MnO 2能有效地氧化Hg-0。从XPS分析，存在对应于二价汞的峰。因此，在Mnx+/Ca（OH）（2）的表面上存在氧化汞。MnO 2的存在影响汞的形态。
The adsorption abilities for vapor-phase Hg-0 by a Ca-based sorbent were investigated in an attempt to produce more effective sorbents for the control of elemental mercury emission. Ca(OH)(2) and Mnx+ doped in Ca(OH)(2) have been characterized by surface analytical methods, such as Brunauer-Emmett-Teller (BET) surf ice area, scanning electron micrographs (SEMs), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The mercury adsorption characteristic was also revealed by XPS. The results showed that mercury removal by Mnx+/Ca(OH)2 was a bit higher than that by Ca(OH)(2). From mercury speciation measurement, Hg-0 could be oxidized by MnO2 effectively. From XPS analysis, there was a peak corresponding to the divalent mercury. Thus, there was oxidized mercury on the surface of Mnx+/Ca(OH)(2). The presence of MnO2 affected mercury speciation.