Novel Synergetic Effect of Fe and W in FeWSx/TiO2 on Capturing High Concentrations of Gaseous Hg0 from Smelting Flue Gas: Adsorption Kinetics and Structure–Activity Relationship
Novel Synergetic Effect of Fe and W in FeWSx/TiO2 on Capturing High Concentrations of Gaseous Hg0 from Smelting Flue Gas: Adsorption Kinetics and Structure–Activity Relationship
复制标题
DOI：
10.1021/acs.iecr.9b05704
复制
发表时间：
2020-01
影响因子：
4.2
通讯作者：
Chang Wang;Qixing Hu;Qi Zhang;Jian Mei;Shijian Yang
中科院分区：
文献类型：
--
作者：
Chang Wang;Qixing Hu;Qi Zhang;Jian Mei;Shijian Yang
In this work, a regenerable sorbent FeWSₓ/TiO₂ was used to reclaim gaseous Hg⁰ in smelting flue gas for centralized control. FeWSₓ/TiO₂ exhibited excellent ability to adsorb Hg⁰, with the adsorption rate of 25.0 μg g–¹ min–¹. There was a novel synergetic effect of Fe and W in FeWSₓ/TiO₂ for Hg⁰ adsorption, and the rate of Hg⁰ adsorption onto FeWSₓ/TiO₂ was generally greater than the total of those onto FeSₓ/TiO₂ and WSₓ/TiO₂. The structure–activity relationship of FeWSₓ/TiO₂ for Hg⁰ capture was discovered according to the kinetic analysis. FeWSₓ/TiO₂’s capacity for Hg⁰ adsorption was approximately dependent on the number of S₂²– on the surface. Meanwhile, the rate of adsorption of Hg⁰ onto FeWSₓ/TiO₂ was proportional to the product of the number of S₂²– on the surface and the number of surface adsorption sites for the physical adsorption of gaseous Hg⁰. Although S₂²– on FeSₓ/TiO₂ did not increase obviously after W incorporation, the adsorption sites on FeSₓ/TiO₂ obviously increased due to the appearance of WS₃. Therefore, the rate of adsorption of Hg⁰ onto FeWSₓ/TiO₂ was 1.8–2.3 times that on FeSₓ/TiO₂.
