Xu Haomiao, Ma Yongpeng, Mu Bailong, Huang Wenjun, Hong Qinyuan, Liao Yong, Qu Zan, Yan Naiqiang
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450001, China.
J Hazard Mater. 2020 Jun 15;392:122230. doi: 10.1016/j.jhazmat.2020.122230. Epub 2020 Feb 8.
It is difficult to stabilize gaseous elemental mercury (Hg°) on a sorbent from SO-containing industrial flue gas. Enhancing Hg° oxidation and activating surface-active sulfur (S*) can benefit the chemical mercury adsorption process. A Mn-SnS composite was prepared using the Mn modification of SnS nanosheets to expose more Mn oxidation and sulfur adsorption sites. The results indicate that Mn-Sn exhibits better Hg° removal performances at a wide temperature range of 100-250 °C. A sufficient amount of surface Mn with a valance state of Mn is favorable for Hg° oxidation, while the electron transfer properties of Sn can accelerate this oxidation process. Oxidized mercury primary exists as HgS with surface S*. A larger surface area, stable crystal structure, and active valance state of each element are favorable for Hg° oxidation and adsorption. The Mn-SnS exhibits an excellent SO resistance when the SO concentration is lower than 1500 ppm. The effects of HO and O were also evaluated. The results show that O has no influence, while HO and SO coexisting in the flue gas have a toxic effect on the Hg° removal performance. The Mn-SnS has a great potential for the Hg° removal from SO-containing flue gas such as non-ferrous smelting gas.
从含硫工业烟气中在吸附剂上稳定气态元素汞（Hg°）是困难的。增强Hg°氧化并活化表面活性硫（S*）有利于化学汞吸附过程。通过对SnS纳米片进行Mn改性制备了Mn-SnS复合材料，以暴露出更多的Mn氧化和硫吸附位点。结果表明，Mn-Sn在100-250 °C的宽温度范围内表现出更好的Hg°去除性能。具有Mn价态的足量表面Mn有利于Hg°氧化，而Sn的电子转移特性可加速该氧化过程。氧化汞主要以与表面S*结合的HgS形式存在。较大的表面积、稳定的晶体结构以及各元素的活性价态有利于Hg°氧化和吸附。当SO浓度低于1500 ppm时，Mn-SnS表现出优异的抗SO性能。还评估了HO和O的影响。结果表明，O没有影响，而烟气中HO和SO共存对Hg°去除性能有不利影响。Mn-SnS在从含硫烟气如有色冶炼烟气中去除Hg°方面具有很大潜力。
