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首页> 外文期刊>Environmental Science & Technology >Sequential Extraction Study of Stability of Adsorbed Mercury in Chemically Modified Activated Carbons
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Sequential Extraction Study of Stability of Adsorbed Mercury in Chemically Modified Activated Carbons

机译：化学改性活性炭中吸附汞稳定性的连续萃取研究

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摘要

Activated carbons chemically modified with sulfur and bromine are known for their greater effectiveness in capturing vapor Hg from coal combustion and other industrial flue gases. The stability of captured Hg in spent activated carbons determines the final fete of Hg and is critical to devising Hg control strategy.However, it remains a subject that is largely unknown, particularly for Br-treated activated carbons. Using a six-step sequential extraction procedure, this work evaluated the leaching potential of Hg captured with four activated carbons, one lignite-derived activated carbon, and three chemically treated with Br_2,KClO_3, and SO_2. The results demonstrated clearly the positive effect of Br- and SO_2-treatment on the stability of captured Hg. The Hg captured with brominated activated carbon was very stable and likely in the form of mercurous bromide complex. Sulfur added at high temperature with SO_2 was able to stabilize a majority of Hg by forming sulfide and possibly sulfonate chelate. The presence of sulfete however made a small fraction of captured Hg (<10%) labile under mild conditions. Treating activated carbon with KC1O_3 lowered the overall stability of captured Hg. A positive dependence of Hg stability on Hg loading temperature was observed for the first time.
机译：用硫和溴进行化学改性的活性炭以更有效的方式捕获煤燃烧和其他工业烟道气中的汞，因而广为人知。废活性炭中捕获的Hg的稳定性决定了Hg的最终含量，这对于制定Hg控制策略至关重要，但是，仍然是一个未知数很大的主题，尤其是对于Br处理的活性炭而言。使用六步顺序萃取程序，这项工作评估了用四种活性炭，一种褐煤衍生的活性炭以及三种用Br_2，KClO_3和SO_2化学处理的汞所捕获的Hg的浸出潜力。结果清楚地表明了Br和SO_2处理对捕获的Hg稳定性的积极影响。用溴化活性炭捕获的汞非常稳定，可能以溴化亚汞络合物的形式存在。在高温下与SO_2加入的硫能够通过形成硫化物和可能的磺酸盐螯合物来稳定大部分Hg。然而，在温和条件下，硫的存在会使捕获的汞的一小部分（<10％）不稳定。用KClO_3处理活性炭会降低捕获的Hg的总体稳定性。首次观察到汞稳定性对汞负载温度的正相关性。

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  • 来源
    《Environmental Science & Technology》 |2011年第17期|p.7416-7421|共6页
  • 作者

    Shitang Tong; Mingxia Fan; Lei Mao; Charles Q.Jia;

  • 作者单位

    Department of Chemical Engineering, Wuhan University of Science and Technology, 947 Heping Avenue, Wuhan, Hubei, 430081,China;

    Department of Chemical Engineering, Wuhan University of Science and Technology, 947 Heping Avenue, Wuhan, Hubei, 430081,China;

    Department of Chemical Engineering, Wuhan University of Science and Technology, 947 Heping Avenue, Wuhan, Hubei, 430081,China;

    Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, M5S 3E5, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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