Co9S8 nanoparticles-embedded porous carbon: A highly efficient sorbent for mercury capture from nonferrous smelting flue gas

Yang, Sen; Cao, Lei; Wang, Pingshan; Yi, Huimin; Shen, Fenghua; Liu, Hui

doi:10.1016/j.jhazmat.2020.124970

Cited by 42 publications

(11 citation statements)

References 49 publications

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“…The equilibrium adsorption capacity of CuFeSe 2 through the pseudo-first-order simulation was 526.7 mg·g –1 , exceeding the saturated adsorption capacity of various materials (shown in Figure d). ,,− In addition, for the application of sorbents for Hg 0 capture from coal combustion flue gas, the adsorption rate plays a critical role in evaluating the applicability, and the initial Hg 0 adsorption rate of CuFeSe 2 reached up to 900.71 μg·g –1 ·min –1 . As shown in Figure d, the magnitude of the Hg 0 adsorption rate of CuFeSe 2 was higher than those of benchmark mercury sorbents with relatively decent Hg 0 uptake rates. ,,− It should be noted that by adjusting the chemical properties of selenide ligands, although the adsorption capacity of CuFeSe 2 was enhanced by several folds, the magnitude of the adsorption rate of CuFeSe 2 was profoundly boosted. The extraordinary kinetics warrant the exhaustion of adsorption capacity within a short-time contact, hence significantly extending the applicability of CuFeSe 2 under an injection scenario.…”

Section: Resultsmentioning

confidence: 91%

Coordinatively Unsaturated Selenides over CuFeSe₂ toward Highly Efficient Mercury Immobilization

Qin

et al. 2021

Environ. Sci. Technol.

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Metal selenides have been demonstrated as promising Hg0 remediators, while their inadequate adsorption rate primarily impedes their application feasibility. Based on the critical role of coordinatively unsaturated selenide ligands in immobilizing Hg0, this work proposed a novel strategy to enhance the Hg0 adsorption rate of metal selenides by magnitudes by purposefully adjusting the selenide saturation. Copper iron diselenide (CuFeSe2), in which the surface reconstruction tended to occur at ambient temperature, was adopted as the concentrator of unsaturated selenides. The adsorption rate of CuFeSe2 reached as high as 900.71 μg·g–1·min–1, far exceeding those of the previously reported metal selenides by at least 1 magnitude. The excellent resistance of CuFeSe2 to flue gas interference and temperature fluctuation warrants its applicability in real-world conditions. The theoretical investigations and mechanistic interpretations based on density functional theory (DFT) calculation further confirmed the indispensable role of unsaturated selenides in Hg0 adsorption. This work aims not only to develop a Hg0 remediator with extensive applicability in coal combustion flue gas but also to take a step toward the rational design of selenide-based sorbents for diverse environmental remediation by the facile surface functionalization of coordinatively adjustable ligands.

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Section: Resultsmentioning

confidence: 91%

Coordinatively Unsaturated Selenides over CuFeSe₂ toward Highly Efficient Mercury Immobilization

Qin

et al. 2021

Environ. Sci. Technol.

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“…The pseudo-second-order kinetic model was described as where q t and q e are the mercury capture at time t (min) and at equilibrium, respectively. k 1 (min –1 ) and k 2 (g·mg –1 ·min –1 ) represent the rate constants of the two kinetic models, respectively.…”

Section: Resultsmentioning

confidence: 99%

Disordered MoS₂ Nanosheets with Widened Interlayer Spacing for Elemental Mercury Adsorption from Nonferrous Smelting Flue Gas

et al. 2021

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The development of a sorbent with a large elemental mercury (Hg0) adsorption capacity under a high SO2 concentration atmosphere is the key point for mercury emission control from nonferrous smelting (NFS) flue gas. By controlling the degree of crystallization, oxygen incorporation and disorder engineering were simultaneously realized to improve the Hg0 adsorption capacity of MoS2 nanosheets for the first time. The interlayer spacing of oxygen-incorporated MoS2 nanosheets reaches up to 9.4 Å from 6.4 Å of normal MoS2 nanosheets, which enhances the exposure of the active sites. Oxygen-incorporated MoS2 nanosheets display a disordered structure, indicating the declined crystallinity and increased active sites. Benefiting from the above synergistic advantages, oxygen incorporation and structure disorder increases significantly the equilibrium Hg0 adsorption capacity of MoS2 nanosheets to 16.26 mg·g–1 under 6% SO2 atmosphere, which is about 2.5 times larger than that of normal MoS2 nanosheets. Both external mass transfer and chemisorption control Hg0 adsorption on MoS2. Surface Mo5+ and S2 2– act as the main active sites generated by disorder engineering for capturing Hg0, and HgS is the final product of Hg0 adsorption. The simultaneous optimization of structural and chemical properties in this work provides an effective and convenient strategy to improve the Hg0 adsorption capacity of MoS2 nanosheets.

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“…Coal combustion is one of the largest industrial sources of mercury emission. The mercury emitted from typical coal-combustion flue gas generally existed in three forms, i.e., elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ), and particulate bound mercury (Hg p ) [4][5][6][7][8]. The Hg p can be captured by using particulate matter control devices, while the Hg 2+ can be removed by using wet flue-gas scrubbers due to Hg 2+ 's water solubility [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

Yang

Meng

et al. 2022

Energies

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The emission of mercury from coal combustion has caused consequential hazards to the ecosystem. The key challenge to abating the mercury emission is to explore highly efficient adsorbents. Herein, sulfur-functionalized carbon (S-C) was synthesized by using a molten-salt pyrolysis strategy and employed for the removal of elemental mercury from coal-combustion flue gas. An ideal pore structure, which was favorable for the internal diffusion of the Hg0 molecule in carbon, was obtained by using a SiO2 hard template and adjusting the HF etching time. The as-prepared S-C with an HF etching time of 10 h possessed a saturation Hg0 adsorption capacity of 89.90 mg·g−1, far exceeding that of the commercial sulfur-loaded activated carbons (S/C). The S-C can be applied at a wide temperature range of 25–125 °C, far exceeding that of commercial S/C. The influence of flue gas components, such as SO2, NO, and H2O, on the Hg0 adsorption performance of S-C was insignificant, indicating a good applicability in real-world applications. The mechanism of the Hg0 removal by S-C was proposed, i.e., the reduced components, including sulfur thiophene, sulfoxide, and C-S, displayed a high affinity toward Hg0, which could guarantee the stable immobilization of Hg0 as HgS in the adsorbent. Thus, the molten-salt pyrolysis strategy has a broad prospect in the application of one-pot carbonization and functionalization sulfur-containing organic precursors as efficient adsorbents for Hg0.

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Co9S8 nanoparticles-embedded porous carbon: A highly efficient sorbent for mercury capture from nonferrous smelting flue gas

Cited by 42 publications

References 49 publications

Coordinatively Unsaturated Selenides over CuFeSe₂ toward Highly Efficient Mercury Immobilization

Coordinatively Unsaturated Selenides over CuFeSe₂ toward Highly Efficient Mercury Immobilization

Disordered MoS₂ Nanosheets with Widened Interlayer Spacing for Elemental Mercury Adsorption from Nonferrous Smelting Flue Gas

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

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Co9S8 nanoparticles-embedded porous carbon: A highly efficient sorbent for mercury capture from nonferrous smelting flue gas

Cited by 42 publications

References 49 publications

Coordinatively Unsaturated Selenides over CuFeSe2 toward Highly Efficient Mercury Immobilization

Coordinatively Unsaturated Selenides over CuFeSe2 toward Highly Efficient Mercury Immobilization

Disordered MoS2 Nanosheets with Widened Interlayer Spacing for Elemental Mercury Adsorption from Nonferrous Smelting Flue Gas

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

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Coordinatively Unsaturated Selenides over CuFeSe₂ toward Highly Efficient Mercury Immobilization

Coordinatively Unsaturated Selenides over CuFeSe₂ toward Highly Efficient Mercury Immobilization

Disordered MoS₂ Nanosheets with Widened Interlayer Spacing for Elemental Mercury Adsorption from Nonferrous Smelting Flue Gas