1. Electrostatically directed assembly of macroporous skeleton structured copper selenide for elemental mercury sequestration from coal-fired flue gas.
- Author
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Meng, Fanyue, Zhu, Penglin, Zu, Hongxiao, Yang, Zequn, Qu, Wenqi, Xu, Zhengyong, Wen, Peizhong, Yang, Jianping, and Li, Hailong
- Subjects
FLUE gases ,SPONGE (Material) ,MOLDING materials ,ADSORPTION capacity ,COPPER ,SKELETON ,MERCURY - Abstract
Decontamination of Hg
0 from coal-fired flue gas remains an enormous challenge. It is an imperative pursuit to design adsorbents bearing an abundance of accessible chelating sites with a high affinity toward mercury, thus achieving both rapid uptake and high capacity for Hg0 . Herein, an electrostatically directed assembly strategy was designed to construct Cu 2 Se decorated commercial polyurethane sponge (Cu 2 Se/PUS) as an efficient Hg0 trap. The surface coverage of Cu 2 Se on the Cu 2 Se/PUS can be rationally adjusted by turning the charge density of Cu 2 Se and PUS. The saturated Hg0 adsorption capacity of Cu 2 Se/PUS was achieved at 217.04 mg g−1 (normalized to the Cu 2 Se coating amount), which was much higher than that of powdery Cu 2 Se (43.66 mg g−1 ). Multiform selenium active sites (Se- and Se2- ) and copper-terminated active centers of Cu 2 Se/PUS co-participated in Hg0 adsorption, instead of the individual role of Se- over powdery Cu 2 Se. The macroporous skeleton structure and the highly dispersed Cu 2 Se boosted the diffusion of mercury to the active sites for immobilization, thus accelerating the consumption of multiple active sites on the Cu 2 Se/PUS. This work not only provided an efficient Hg0 trap but also showed great inspiration for the potential of electrostatically directed assembly methods in constructing adsorbents for diverse environmental remediations. [Display omitted] • Integrated macroporous skeleton molding material as an efficient Hg0 trap. • Electrostatically directed assembly strategy was designed to construct Cu 2 Se/PUS. • The Hg0 adsorption capacity of Cu 2 Se/PUS was as high as 217.04 mg g−1 . • Se- , Se2- and Cu-terminated centers of Cu 2 Se/PUS co-participated in Hg0 adsorption. [ABSTRACT FROM AUTHOR]- Published
- 2024
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