Co3O4/g-C3N4 Hybrids for Gas-Phase Hg0 Removal at Low Temperature

Zhang, Zhen; Wu, Jiang; Liu, Dongjing

doi:10.3390/pr7050279

Cited by 38 publications

(9 citation statements)

References 43 publications

(47 reference statements)

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“…They usually exert big effects on the mercury removal performance of a wide variety of adsorbents, such as activated carbon and metal oxides. Especially, the high concentration of SO 2 in flue gas would poison metal-oxide adsorbents . Therefore, good SO 2 resistance is a key aspect in the development of effective mercury adsorbents.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…Especially, the high concentration of SO 2 in flue gas would poison metal-oxide adsorbents. 41 Therefore, good SO 2 resistance is a key aspect in the development of effective mercury adsorbents. The impacts of NO and SO 2 on the Hg 0 capture efficiency of 10CuS/h-BN at 100 °C are presented in Figure 11.…”

Section: Resultsmentioning

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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“…On the other side, the holes in the valence band of g-C 3 N 4 can directly oxidize the pollutants to degraded products since these holes have strong oxidizing power [495]. g-C 3 N 4 -metal oxide heterojunction is used to degrade different elements such as Hg, Cr (VI) [136,496,497], and different toxic and harmful materials such as atrazine (ATZ), chloramphenicol, ciprofloxacin (CIP), and etc. [197,454,[498][499][500][501][502].…”

Section: Photodegradation Of Organic Pollutantsmentioning

confidence: 99%

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

2022

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g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4–metal-oxide-based heterojunctions.

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“…Deposition of MnO 2 and Co 3 O 4 nanoparticles onto a CNNS surface prominently reinforced its mercury capture performance. 90,91 The multiple valences of Mn and Co elements impart them superior redox capabilities, accounting for the enhanced mercury capture abilities of MnO 2 /CNNS and Co 3 O 4 / CNNS composites. Furthermore, the promoted electron mobility at the interface of MnO 2 or Co 3 O 4 nanoparticles and g-C 3 N 4 nanosheets is another important contributor.…”

Section: Adsorptive Capture Of Elemental Mercurymentioning

confidence: 99%

“…42.5%–65.8% at temperatures of 90–240 °C likely owing to its sheet-like structure and large specific surface area (109 m 2 /g). Deposition of MnO 2 and Co 3 O 4 nanoparticles onto a CNNS surface prominently reinforced its mercury capture performance. , …”

Section: Adsorptive Capture Of Elemental Mercurymentioning

confidence: 99%

Graphitic Carbon Nitride for Gaseous Mercury Emission Control: A Review

et al. 2022

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Mercury emissions from combustion of coal, biomass, and solid waste threaten human life and the environment. As the principal mercury species in flue gas, elemental mercury (Hg0) can easily escape from available air pollution control instruments because of its chemical inertness, high volatility, and aqueous insolubility. Recently, graphitic carbon nitride (g-C3N4) seems to be an intriguing candidate for Hg0 emission control. This review highlights the latest advances in adsorptive and photocatalytic removal of Hg0 by g-C3N4-based composites. Metal oxide (MeO x )- and halide-modified g-C3N4 can effectively capture Hg0 from simulated flue gas. Nonetheless, acidic flue gas components can degrade the performances of MeO x /g-C3N4 adsorbents, while halide-modified g-C3N4 suffers from release of halogen and potential leaching risk of mercury. Metal sulfide (MeS x )-modified g-C3N4 appears to be the best candidate for Hg0 capture owing to its superior tolerance to sulfur dioxide, fast adsorption rate, and high mercury capacity. Combining bismuth oxyhalides (BiOX) with g-C3N4 can promote photocatalytic oxidation of elemental mercury under visible light irradiation; nonetheless, the Hg0 removal efficiency is still unsatisfactory, and the underlying photocatalysis mechanism is not yet clear.

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Co3O4/g-C3N4 Hybrids for Gas-Phase Hg0 Removal at Low Temperature

Cited by 38 publications

References 43 publications

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

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

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

Graphitic Carbon Nitride for Gaseous Mercury Emission Control: A Review

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