Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
J Environ Sci (China). 2019 May;79:111-120. doi: 10.1016/j.jes.2018.11.014. Epub 2018 Dec 1.
Hierarchical Ag-SiO@FeO magnetic composites were selected for elemental mercury (Hg) removal from non-ferrous metal smelting flue gas in this study. Results showed that the hierarchical Ag-SiO@FeO magnetic composites had favorable Hg removal ability at low temperature. Moreover, the adsorption capacity of hierarchical magnetic composite is much larger than that of pure FeO and SiO@FeO. The Hg removal efficiency reached the highest value as approximately 92% under the reaction temperature of 150°C, while the removal efficiency sharply reduced in the absence of O. The characterization results indicated that Ag nanoparticles grew on the surface of SiO@FeO support. The large surface area of SiO supplied efficient reaction room for Hg and Ag atoms. Ag-Hg amalgam is generated on the surface of the composites. In addition, this magnetic material could be easily separated from fly ashes when adopted for treating real flue gas, and the spent materials could be regenerated using a simple thermal-desorption method.
本研究选用分级 Ag-SiO@FeO 磁性复合材料从有色金属冶炼烟气中去除元素汞 (Hg)。结果表明，在低温下，分级 Ag-SiO@FeO 磁性复合材料具有良好的 Hg 去除能力。此外，分级磁性复合材料的吸附容量远大于纯 FeO 和 SiO@FeO。在 150°C 的反应温度下，Hg 的去除效率达到最高值，约为 92%，而在没有 O 的情况下，去除效率急剧下降。表征结果表明，Ag 纳米颗粒在 SiO@FeO 载体表面生长。SiO 的大表面积为 Hg 和 Ag 原子提供了有效的反应空间。Ag-Hg 汞齐在复合材料表面生成。此外，当用于处理实际烟气时，这种磁性材料可以很容易地从飞灰中分离出来，并且可以使用简单的热解吸方法对用过的材料进行再生。
