3D hierarchical iron-cobalt sulfide anchored on carbon fiber with abundant active short chain sulfur for high-efficiency capture of elemental mercury

Liu, Zhilou; Zhang, Zhiheng; Li, Ziliang; Xie, Xiaofeng; Zhong, Shuiping; Li, Yuhu; Xu, Zhifeng; Liu, Hui

doi:10.1016/j.cej.2021.129442

Cited by 41 publications

(16 citation statements)

References 42 publications

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“…Thus, for the metal sulfides whose major active sites are unsaturated S, the inhibition of H 2 O or SO 2 is usually not significant. 37,48,88 On the contrary, the competitive adsorption mechanism can strikingly impede the Hg 0 immobilization over the metal sulfides, whose primary active site is M sites. TPD results suggested that the Hg−Cu alloy was the main adsorption product over CuS; i.e., surface Cu sites were the major active sites for Hg 0 capture.…”

Section: Engineered Metal Sulfidesmentioning

confidence: 98%

“…For the flue gas components with relatively high chemical inertness, such as water (H 2 O) and sulfur dioxide (SO 2 ), they tend to physically adsorb rather than decompose over metal sulfides, which results in a competitive adsorption mechanism. , The competitive adsorption mechanism is mainly responsible for the consumption of surface M sites. Thus, for the metal sulfides whose major active sites are unsaturated S, the inhibition of H 2 O or SO 2 is usually not significant. ,, On the contrary, the competitive adsorption mechanism can strikingly impede the Hg 0 immobilization over the metal sulfides, whose primary active site is M sites. TPD results suggested that the Hg–Cu alloy was the main adsorption product over CuS; i.e., surface Cu sites were the major active sites for Hg 0 capture. , Accordingly, the addition of 20% H 2 O decreased the Hg 0 immobilization performance by more than 50% .…”

Section: Influences Of Flue Gas Components On Hg0 Removalmentioning

confidence: 99%

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Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Deng

et al. 2022

Energy Fuels

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Atmospheric mercury (Hg) pollution has attracted global attention as a result of its great harm to the ecosystem. By virtue of abundant surface Hg-philic sulfur sites, metal sulfides have been regarded as a promising Hg adsorbent. The Hg adsorption performance of metal sulfides is mainly determined by the distribution of surface active sites; thus, it is crucial to understand the interactions between the Hg atom and different surface sites. In this review, the immobilization mechanism of the Hg atom over metal sulfides was systematically summarized. First, the roles of surface active sites, i.e., metal and sulfur sites, played in Hg 0 adsorption were systematically elaborated, to explain the excellent performance of metal sulfides. Second, the improvement on the Hg 0 adsorption ability of engineered metal sulfides was attributed to the reasonable regulation of surface unsaturation and the introduction of alien active sites. Eventually, the effects of flue gas components on mineral sulfides were illuminated from the perspective of the introduction/consumption of surface active sites. The objective of this review was to interpret the detailed Hg 0 immobilization mechanism and to provide guidance for developing metal-sulfide-based sorbents, and the future prospects and challenges related to the Hg 0 adsorption mechanism by metal sulfides were discussed.

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Section: Engineered Metal Sulfidesmentioning

confidence: 98%

Section: Influences Of Flue Gas Components On Hg0 Removalmentioning

confidence: 99%

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Deng

et al. 2022

Energy Fuels

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“…developed the interface activation method of ZnS through the weak oxidation of S 2– by Cu 2+ ions, resulting in the formation of active S 1– sites . Liu et al found out that a reasonable ratio of Fe/Co could benefit the formation of active short chain sulfur S 2 2– . In addition to adjusting the sulfur sites, metal elements with high valence were favorable for the oxidation of pollutants.…”

Section: Introductionmentioning

confidence: 99%

“…23 Liu et al found out that a reasonable ratio of Fe/Co could benefit the formation of active short chain sulfur S 2 2− . 24 In addition to adjusting the sulfur sites, metal elements with high valence were favorable for the oxidation of pollutants. For instance, Mn-modified SnS 2 nanosheets exposed more Mn-oxidation and sulfur adsorption sites, which exhibited better mercury removal performance.…”

Section: Introductionmentioning

confidence: 99%

Regulation of the Sulfur Environment in Clusters to Construct a Mn–Sn₂S₆ Framework for Mercury Bonding

Hong

et al. 2022

Environ. Sci. Technol.

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The remarkable chemical activity of metal–sulfur clusters lies in their unique spatial configuration associated with the abundant unsaturated-coordination nature of sulfur sites. Yet, the manipulation of sulfur sites normally requires direct contact with other metal atoms, which inevitably changes the state of the coordinated sulfur. Herein, we facilely construct a Mn–Sn2S6 framework by regulating the sulfur environment of the [Sn2S6]4– cluster with metal ions. Mn–Sn2S6 showed superior removal performance to gaseous elemental mercury (Hg0) at low temperatures (20–60 °C) and exhibited high resistance against SO2. Moreover, Mn–Sn2S6 can completely remove liquid Hg2+ ions with low or high concentrations from acid wastewater. In addition, the adsorption capacities of Mn–Sn2S6 toward Hg0 and Hg2+ reached 21.05 and 413.3 mg/g, respectively. The results of physico-chemical characterizations revealed that compared with Cu2+, Co2+, and Fe2+, the moderate regulation of Mn2+ led to the special porous spherical structure of Mn–Sn2S6 with uniform element distribution, due to the difference of electrode potentials [E θ(Mn2+/Mn) < E θ(S/S2–) < E θ(Sn4+/Sn2+)]. The porous structure was beneficial to Hg0 and Hg2+ adsorption, and the presence of Mn4+/Mn3+ and S1– promoted the oxidation of Hg0, resulting in stable HgS species. The constructed Mn–Sn2S6, thus, is a promising sorbent for both Hg0 ang Hg2+ removal and provides guidelines for cluster-based materials design and tuning.

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“…At the same time, as an important basic chemical raw material, sulfur is widely used in the chemical industry, light industry, nonferrous metal smelting, and synthesis of functional high-performance materials, such as lithium–sulfur batteries, sulfide semiconductors, and sulfur-based mercury removal materials. − Sulfur has broad market prospects and is an ideal desulfurization product . Reducing SO 2 to sulfur can not only realize the resource-based desulfurization process and obtain high-value desulfurization byproducts, but also could effectively alleviate the scarcity of sulfur resources.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO₂ with CO over an Iron/BFS Catalyst

et al. 2021

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To realize high-value sulfur recovery and decrease the reaction temperature, a cobalt-doped modified iron-based catalyst was prepared from blast furnace slag (BFS), which is a byproduct of steelmaking. The effects of the carrier and active components on the catalytic reduction performance were studied, and the mechanism of the optimized modification to promote catalytic reduction was explored. When the mass ratio of cobalt tetroxide, ferric oxide, and the carrier in the catalyst was 4:15:81, the temperature required for the reaction was reduced to 400 °C, and the SO2 conversion rate and average sulfur yield were maintained above 90 and 80% within 2 h, respectively. The results of an in situ diffuse reflectance infrared Fourier-transform spectroscopy experiment and density functional theory calculations revealed that the catalytic mechanism followed both the redox route and the cosine intermediate route. The cobalt-doped modification increased the intermediate acidic sites on the catalyst surface and widened the adsorption temperature range of the catalyst, thus positively promoting the catalytic reaction.

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3D hierarchical iron-cobalt sulfide anchored on carbon fiber with abundant active short chain sulfur for high-efficiency capture of elemental mercury

Cited by 41 publications

References 42 publications

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Regulation of the Sulfur Environment in Clusters to Construct a Mn–Sn₂S₆ Framework for Mercury Bonding

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO₂ with CO over an Iron/BFS Catalyst

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3D hierarchical iron-cobalt sulfide anchored on carbon fiber with abundant active short chain sulfur for high-efficiency capture of elemental mercury

Cited by 41 publications

References 42 publications

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Mechanisms of Gas-Phase Mercury Immobilized by Metal Sulfides from Combustion Flue Gas: A Mini Review

Regulation of the Sulfur Environment in Clusters to Construct a Mn–Sn2S6 Framework for Mercury Bonding

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO2 with CO over an Iron/BFS Catalyst

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Regulation of the Sulfur Environment in Clusters to Construct a Mn–Sn₂S₆ Framework for Mercury Bonding

Effects of Cobalt-Doped Modification on the Catalytic Reduction of SO₂ with CO over an Iron/BFS Catalyst