Comparison of pyrite-phase transition metal sulfides for capturing leaked high concentrations of gaseous elemental mercury in indoor air: Mechanism and adsorption/desorption kinetics
Comparison of pyrite-phase transition metal sulfides for capturing leaked high concentrations of gaseous elemental mercury in indoor air: Mechanism and adsorption/desorption kinetics
复制标题
黄铁矿相过渡金属硫化物捕获室内空气中泄漏的高浓度气态元素汞的比较：机理和吸附/解吸动力学
DOI：
10.1016/j.jcis.2022.04.144
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发表时间：
2022
影响因子：
9.9
通讯作者：
Yang Shijian
中科院分区：
文献类型：
--
作者：
Wang Jian;Yang Zhenya;Mei Jian;Wang Chang;Hong Qianqian;Yang Shijian
Understanding the characteristics of pyrite-phase transition metal sulfides for the adsorption and desorption of gaseous elemental mercury (Hg0) is of vital significance for their applications in gaseous Hg0capture. In this study, the adsorption and desorption of gaseous Hg0onto pyrite-phase transition metal sulfides (i.e., FeS2/TiO2, CoS2/TiO2, and NiS2/TiO2) were compared, and the mechanisms of their differences were revealed by the kinetic analysis. The Co/Nisingle bondS and Ssingle bondS bonds in dumbbell-shaped CoS2and NiS2were not entirely broken after oxidizing physically adsorbed Hg0, whereas the Fesingle bondS and Ssingle bondS bonds in dumbbell-shaped FeS2were. Thus, the activation energies of CoS2/TiO2and NiS2/TiO2for oxidizing physically adsorbed Hg0were smaller than that of FeS2/TiO2, causing the stronger abilities of CoS2/TiO2and NiS2/TiO2to oxidize physically adsorbed Hg0than that of FeS2/TiO2. However, the bonding strengths of Hg-S in HgS adsorbed on dumbbell-shaped CoS2and NiS2were relatively weaker because of the sharing of S2−in HgS with S−and Co2+/Ni2+, causing the decreases in heat stabilities of HgS adsorbed on CoS2/TiO2and NiS2/TiO2. Therefore, HgS adsorbed on CoS2/TiO2and NiS2/TiO2can be voluntarily decomposed to release gaseous Hg0, which should be combined with FeS2/TiO2for the emergency treatment of liquid Hg0leakage indoors.
