Conversion of Gaseous Hg0 Capture by CuS from Surface Adsorption to the Replacement Reaction through Intermittent
Jialiang Zhou1, Pengjian Lv1, Yu Bin1
1School of Environment and Ecology, Jiangnan University, Wuxi 214122, P. R. China.
None:
Metal sulfides are promising for capturing gaseous Hg0, but their adsorption capacities are limited due to Hg0 adsorption only on superficial unsaturated sulfur (S) coordination. Therefore, enabling saturated S coordination beneath the surface to participate in Hg0 adsorption is an innovative and effective strategy. In this study, surface adsorption of Hg0 on CuS was converted into a replacement reaction with a stoichiometric ratio of 1:6 through intermittent acid washing, allowing 2/3 of sulfur in CuS to contribute to Hg0 adsorption, significantly increasing the capacity theoretically to 348 mg g-1. The formation of a Cu vacancy due to the dissociation of four-coordinated Cu1 with one dangling bond and the transformation of four-coordinated Cu0 without a dangling bond to Cu1 alternately happened during each acid washing and Hg0 adsorption, respectively, resulting in a chain reaction of the substitution of Cu in CuS by Hg0. Ultimately, 1/4 of four-coordinated Cu1.5+ in CuS can be isomerous-substituted by Hg and dissociated into the acid washing solution, resulting in the growth of one-dimensional HgS in destroyed CuS crystals. CuS with intermittent acid washing demonstrates significant potential for recovering gaseous Hg0 from flue gas, with Hg content in spent CuS exceeding 20%, offering a valuable approach for resource recycling.
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