[MoS₄]^2– Cluster Bridges in Co–Fe Layered Double Hydroxides for Mercury Uptake from S–Hg Mixed Flue Gas

Abstract

[MoS] clusters were bridged between CoFe layered double hydroxide (LDH) layers using the ion-exchange method. [MoS]/CoFe-LDH showed excellent Hg removal performance under low and high concentrations of SO, highlighting the potential for such material in S-Hg mixed flue gas purification. The maximum mercury capacity was as high as 16.39 mg/g. The structure and physical-chemical properties of [MoS]/CoFe-LDH composites were characterized with FT-IR, XRD, TEM&SEM, XPS, and H-TPR. [MoS] clusters intercalated into the CoFe-LDH layered sheets; then, we enlarged the layer-to-layer spacing (from 0.622 to 0.880 nm) and enlarged the surface area (from 41.4 m/g to 112.1 m/g) of the composite. During the adsorption process, the interlayer [MoS] cluster was the primary active site for mercury uptake. The adsorbed mercury existed as HgS on the material surface. The absence of active oxygen results in a composite with high sulfur resistance. Due to its high efficiency and SO resistance, [MoS]/CoFe-LDH is a promising adsorbent for mercury uptake from S-Hg mixed flue gas.

Nanosized Copper Selenide Functionalized Zeolitic Imidazolate Framework‐8 (CuSe/ZIF‐8) for Efficient Immobilization of Gas‐Phase Elemental Mercury

“…The performance of 0.8NC‐ZIF surpasses all the reported sorbents tested in a fixed‐bed reactor no matter the capacity or rate. [6,7b,9c,d,26] Specifically, the capacity of 0.8NC‐ZIF is 3, 3, and 134 times larger than that of the 0.8Nano‐Se/ZIF, the best MSs (Nano‐CuS), and the S‐impregnated AC, respectively. The adsorption rate is one magnitude higher than the reported sorbents with the highest rate (Nano‐CuS) and twofold higher than that of 0.8Nano‐Se/ZIF.…”

Recent progress in functionalized layered double hydroxides and their application in efficient electrocatalytic water oxidation

“…scaled up for industrial production [14,18,19] . Due to the unique physical and chemical properties, LDHs have been widely applied in many fields, including adsorbents [20] , antimicrobial agents [21] , additives in polymers, magnetic materials, and precursors for functional materials [15,22] . In particular, LDHs and their derivatives have been used as electrocatalysts such as alcohol oxidation [23] , OER [1,24,25] , HER [26,27] , and oxygen reduction reaction (ORR) [28][29][30] .…”

Electronic structure regulation on layered double hydroxides for oxygen evolution reaction

“…In particular, the interlayer balanced anions can be exchanged by other organic and inorganic anions [48,49]. Furthermore, LDHs have been extensively applied in various fields owing to their unique, 2D layered structure, easily tailored properties, and versatility of chemical compositions [50,51]. However, the limited number of active sites and the inferior intrinsic activity of the catalytic sites have hindered the development of LDHs as high-performance OER catalysts [52,53].…”