Selective Removal of Elemental Mercury from High-Concentration SO2 Flue Gas by Thiourea Solution and Investigation of Mechanism
Selective Removal of Elemental Mercury from High-Concentration SO2 Flue Gas by Thiourea Solution and Investigation of Mechanism
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硫脲溶液选择性脱除高浓度SO2烟气中元素汞及机理研究
DOI：
10.1021/acs.iecr.7b00044
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发表时间：
2017-04
影响因子：
4.2
通讯作者：
Liu H
中科院分区：
文献类型：
--
作者：
Liu Zhilou;Peng Bing;Chai Liyuan;Liu Hui;Yang Shu;Yang Bentao;Xiang Kaisong;Liu Cao;Wang Dongli;Peng Bing;Chai Liyuan;Liu Hui;Liu H;Liu H
有色金属冶炼业是我国汞的主要人为排放源。提出了一种利用过渡金属-硫脲溶液选择性脱除高浓度SO2烟气中Hg 0的新方法。结果发现，该溶液显示出显着高的Hg 0去除效率，高达88.7%以上，在最佳条件下，而SO2的损失只有6.8%。高Tu浓度、低pH值和低温有利于Hg 0的去除。Fe ~（3+）的促进作用优于Cu ~（2+）。采用多种方法研究了选择性除汞的机理。首先，循环伏安（CV）曲线表明，部分Tu可被氧化为FDS（甲脒二硫化物），FDS可与Hg 0联合收割机形成Hg-Tu络合物。紫外-可见吸收光谱表明，H2SO 3能提高FDS的稳定性，促进FDS对Hg 0的去除。过渡金属-Tu溶液选择性脱除冶炼烟气中的Hg 0，具有良好的效果，可用于工业生产。
Nonferrous metals smelting industry is a major anthropogenic Hg emission source in China. A new method using transition metal-Tu (thiourea) solution was proposed to selectively remove Hg0 from high SO2 concentration flue gas. It is found that this solution displays significantly high Hg0 removal efficiency, up to above 88.7%, under optimal conditions, whereas the loss of SO2 is only 6.8%. High Tu concentration, low solution pH, and low temperature are helpful for Hg0 removal. The promoting effect of Fe3+ is better than that of Cu2+. The mechanism of selective Hg0 removal was studied by various methods. First, the cyclic voltammetry (CV) curves show that part of Tu could be oxidized to FDS (formamidine disulfide), which could combine with Hg0 to form Hg–Tu complex. Additionally, the UV–vis spectra indicate H2SO3 could improve the stability of FDS and facilitate Hg0 removal. In summary, the use of transition metal-Tu solution to selectively remove Hg0 from smelting flue gas displays excellent efficiency, an...
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