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首页> 外文期刊>Environmental Science & Technology >Development of Nano-Sulfide Sorbent for Efficient Removal of Elemental Mercury from Coal Combustion Fuel Gas
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Development of Nano-Sulfide Sorbent for Efficient Removal of Elemental Mercury from Coal Combustion Fuel Gas

机译：纳米硫化物吸附剂有效去除燃煤燃气中汞的研究进展

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摘要

The surface area of zinc sulfide (ZnS) was successfully enlarged using nanostructure particles synthesized by a liquid-phase precipitation method. The ZnS with the highest surface area (named Nano-ZnS) of 196.1 m~2·g~(－1) was then used to remove gas-phase elemental mercury (Hg~0) from simulated coal combustion fuel gas at relatively high temperatures (140 to 260 ℃). The Nano-ZnS exhibited far greater Hg~0 adsorption capacity than the conventional bulk ZnS sorbent due to the abundance of surface sulfur sites, which have a high binding affinity for Hg~0. Hg~0 was first physically adsorbed on the sorbent surface and then reacted with the adjacent surface sulfur to form the most stable mercury compound, HgS, which was confirmed by X-ray photoelectron spectroscopy analysis and a temperature-programmed desorption test. At the optimal temperature of 180 ℃, the equilibrium Hg~0 adsorption capacity of the Nano-ZnS (inlet Hg° concentration of 65.0μg·m~(－3)) was greater than 497.84 μg·g~(－1). Compared with several commercial activated carbons used exclusively for gas-phase mercury removal, the Nano-ZnS was superior in both Hg~0 adsorption capacity and adsorption rate. With this excellent Hg~0 removal performance, noncarbon Nano-ZnS may prove to be an advantageous alternative to activated carbon for Hg~0 removal in power plants equipped with particulate matter control devices, while also offering a means of reusing fly ash as a valuable resource, for example as a concrete additive.
机译：使用通过液相沉淀法合成的纳米结构颗粒，成功地扩大了硫化锌（ZnS）的表面积。然后使用最高表面积为196.1 m〜2·g〜（－1）的ZnS（称为纳米ZnS）从相对较高温度的模拟燃煤燃料气中去除气相元素汞（Hg〜0） （140至260℃）。由于大量的表面硫位，纳米ZnS表现出比常规ZnS吸附剂更大的Hg〜0吸附能力，对Hg〜0具有很高的结合亲和力。 Hg〜0首先物理吸附在吸附剂表面，然后与相邻的表面硫反应形成最稳定的汞化合物HgS，这通过X射线光电子能谱分析和程序升温脱附测试得到了证实。在180℃的最佳温度下，纳米ZnS的平衡Hg〜0吸附能力（入口Hg°浓度为65.0μg·m〜（－3））大于497.84μg·g〜（－1）。与专门用于气相除汞的几种商用活性炭相比，纳米ZnS的Hg〜0吸附容量和吸附速率均优越。凭借这种出色的Hg〜0去除性能，在配备了颗粒物控制装置的电厂中，无碳纳米ZnS可能被证明是活性炭去除Hg〜0的有利替代品，同时还提供了粉煤灰作为有价值的再利用手段。资源，例如作为混凝土添加剂。

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  • 来源
    《Environmental Science & Technology》 |2016年第17期|9551-9557|共7页
  • 作者

    Hailong Li; Lei Zhu; Jun Wang; Liqing Li; Kaimin Shih;

  • 作者单位

    School of Energy Science and Engineering, Central South University, Changsha, China 410083,Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR, China;

    School of Energy Science and Engineering, Central South University, Changsha, China 410083;

    Department of Occupational and Environmental Health, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73126, United States;

    School of Energy Science and Engineering, Central South University, Changsha, China 410083;

    Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR, China;

  • 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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