Elemental mercury capture from industrial gas emissions using sulfides and selenides: a review

Liu, Dongjing; Li, Bin; Wu, Jiang; Liu, Yangxian

doi:10.1007/s10311-020-01130-6

Cited by 33 publications

(9 citation statements)

References 157 publications

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“…However, due to the high adsorbent/mercury ratio, most of the existing adsorbents can not be used on a large scale due to high cost. Relevant studies 71 have shown that sulfur has a strong binding ability with elemental mercury, which can oxidize mercury to HgS.…”

Section: Resultsmentioning

confidence: 99%

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

2021

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A novel H2SO4/H2O2 combining modification was used to modify two kinds of macroalgae (Sargassum and Enteromorpha) biochars to remove gaseous H2S. Desulfurization performance, mechanism, and kinetics of the biochars were studied. The proposed H2SO4/H2O2 combining modification greatly improves the desulfurization performance of biochars. Compared with common adsorbents, the biochars achieve better desulfurization effects. Desulfurization processes follow the pseudo‐first‐order model and external mass transfer is the control step. H2S adsorption over biochars means physical adsorption, while chemical adsorption is auxiliary. H2SO4/H2O2 combining modification improves the desulfurization performance by enhancing the pore structure and increasing O‐containing functional groups.

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Section: Resultsmentioning

confidence: 99%

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

2021

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“…As compared to commonly used modifying reagents, that is, halides and metal oxides, copper sulfide displays stronger Hg 0 affinity and much better resistance to steam and sulfur dioxide . What is more, the reaction product (HgS) is more stable than mercuric halide and mercury oxide, which is conducive to the safety disposal of spent adsorbents . Thus, loading CuS onto h-BN is a feasible way to further improve the Hg 0 removal performance.…”

Section: Introductionmentioning

confidence: 99%

“…22 What is more, the reaction product (HgS) is more stable than mercuric halide and mercury oxide, which is conducive to the safety disposal of spent adsorbents. 23 Thus, loading CuS onto h-BN is a feasible way to further improve the Hg 0 removal performance.…”

Section: Introductionmentioning

confidence: 99%

Copper Sulfide-Loaded Boron Nitride Nanosheets for Elemental Mercury Removal from Simulated Flue Gas

Liu

et al. 2021

Energy Fuels

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Hexagonal boron nitride (h-BN), as a novel carbon-free layered material, has received extensive attention owing to its high mechanical strength and excellent chemical and thermal stability. Herein, an h-BN nanosheet is employed to capture elemental mercury (Hg 0 ) from simulated flue gas in a fixed-bed reactor at low temperatures. The h-BN displays mercury adsorption capability with the Hg 0 removal efficiency of 26.4−43.6% within 50−200 °C. CuS decoration can remarkably enhance the mercury capture performance of h-BN. The 10CuS/h-BN with a CuS loading value of 10 wt % performs the best. Complete mercury capture can be achieved over 10CuS/h-BN at 50−100 °C. The presence of NO inhibits Hg 0 removal to some extent, while the presence of SO 2 hardly shows any impact on Hg 0 capture. The copper and polysulfide sites as well as the nanoscale lamellar structure of h-BN account for the good Hg 0 capture performance of CuS-loaded h-BN.

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“…It was confirmed that the emissions of industrial flue gas were the main source of atmospheric mercury . Recently, much work has been done to develop an efficient method for the control of mercury emission from industrial flue gas, especially Hg 0 , which is much harder to remove compared with particle-bound mercury (Hg p ) and oxidized mercury (Hg 2+ ). − …”

Section: Introductionmentioning

confidence: 99%

Adsorption of Gaseous Mercury for Engineering Optimization: From Macrodynamics to Adsorption Kinetics and Thermodynamics

Hong

et al. 2021

ACS EST Eng.

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Adsorption is one of the most promising methods for gaseous mercury (Hg 0 ) uptake from industrial flue gas, and the designing and synthesis of a sorbent are of significance for utilization. However, for a pilotscale experiment, the macrodynamics, adsorption kinetics, and thermodynamics should be optimized before real applications. This study designed a scale-up fixed-bed reaction unit that worked with CuS-coated Al 2 O 3 sorbent to investigate the influence of the gaseous diffusion, particle size, and wall effect on Hg 0 removal performances. The results showed that the lower gas flow rate enhanced the mercury removal efficiencies. The combination of CuS/Al 2 O 3 (1−2 mm) and a reaction tube (20 mm) mitigated the influence of size and wall effects, which maintained nearly complete mercury removal over 10 h under at 80 °C and had the average adsorption rate of 0.6 μg g −1 min −1 . Moreover, CuS/Al 2 O 3 possessed a higher SO 2 resistance under a 1%− 6% concentration range, guaranteeing a real application under SO 2 -rich industrial gas. The Hg 0 adsorption was controlled by external diffusion processes based on the kinetic analysis. The negative ΔG (−30.71 to approximately −38.93 kJ mol −1 ), positive ΔS (123.39−138.80 J (mol K) −1 ), and positive ΔH (5.65−12.86 kJ mol −1 ) inferred the spontaneous, irreversible, and endothermic progress of Hg 0 adsorption. The above key parameters have guiding significance for sorbent preparation and bed design in subsequent expanded applications.

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Elemental mercury capture from industrial gas emissions using sulfides and selenides: a review

Cited by 33 publications

References 157 publications

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

Copper Sulfide-Loaded Boron Nitride Nanosheets for Elemental Mercury Removal from Simulated Flue Gas

Adsorption of Gaseous Mercury for Engineering Optimization: From Macrodynamics to Adsorption Kinetics and Thermodynamics

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Elemental mercury capture from industrial gas emissions using sulfides and selenides: a review

Cited by 33 publications

References 157 publications

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H2SO4/H2O2

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H2SO4/H2O2

Copper Sulfide-Loaded Boron Nitride Nanosheets for Elemental Mercury Removal from Simulated Flue Gas

Adsorption of Gaseous Mercury for Engineering Optimization: From Macrodynamics to Adsorption Kinetics and Thermodynamics

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Product

Resources

About

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂