A study on elemental mercury adsorption behaviors of nanoporous carbons with carbon dioxide activation

Bae, Kyong-Min; Park, Soo‐Jin

doi:10.5714/cl.2014.15.4.295

Cited by 2 publications

(4 citation statements)

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“…Such materials include activated carbon, activated carbon fibers, carbon nanofibers, graphite nanofibers (GNFs), mesoporous carbons, and graphite [16][17][18][19][20][21][22]. Among these, activated carbons and activated carbon fibers have been widely used in the field of CO 2 adsorption.…”

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confidence: 99%

“…Their results exhibited the best CO 2 adsorption capacity so far (59.2 mg/g). These GNFs exhibited a narrow pore-size distribution with a uniform distribution of pores on the fiber surface, which are particularly good characteristics for the frequent adsorption and desorption of carbon dioxide [18][19][20][21][22][23][24][25]. In all these cases, it is the total microporosity of the materials that is a critical factor in determining their adsorption capability, and chemical activation with KOH is a significant means to produce such microporosity.…”

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KOH-activated graphite nanofibers as CO₂adsorbents

Yuan¹,

Meng²,

Park³

2016

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Porous carbons have attracted much attention for their novel application in gas storage. In this study, porous graphite nano-fiber (PGNFs)-based graphite nano fibers (GNFs) were prepared by KOH activation to act as adsorbents. The GNFs were activated with KOH by changing the GNF/KOH weight ratio from 0 through 5 at 900°C. The effects of the GNF/ KOH weight ratios on the pore structures were also addressed with scanning electron microscope and N 2 adsorption/desorption measurements. We found that the activated GNFs exhibited a gradual increase of CO 2 adsorption capacity at CK-3 and then decreased to CK-5, as determined by CO 2 adsorption isotherms. CK-3 had the narrowest micropore size distribution (0.6-0.78 nm) among the treated GNFs. Therefore, KOH activation was not only a significant method for developing a suitable pore-size distribution for gas adsorption, but also increased CO 2 adsorption capacity as well. The study indicated that the sample prepared with a weight ratio of '3' showed the best CO 2 adsorption capacity (70.8 mg/g) as determined by CO 2 adsorption isotherms at 298 K and 1 bar. Key words: activated graphite nanofibers, KOH treatment, CO 2 adsorptionThe rapid increase of the greenhouse gas carbon dioxide (CO 2 ) in the atmosphere is generally thought to be a major factor in climate change. These changes are increasingly viewed as a threat to both the global economy and the natural environment [1][2][3][4]. This increase in CO 2 is mainly attributed to human activities [5][6][7][8][9][10]. However, methane (bases: CH 4 50%-70%, CO 2 30%-40%) is one of reproducible biomass energy, which can obtain available energy sources, but also generate abundant greenhouse gas that goes against the purity of CH 4 [10]. It is essential to find an ideal material to work out the austere problem. Usually, CO 2 capture and storage is an efficient green technology used to reduce emissions by transporting and storing CO 2 in deep geologic formations. The capture methods can be classified as post-combustion, pre-combustion, and air separation followed by oxyfuel combustion [7]. Among the currently available technologies, post-combustion is the most easily applied technology. It involves use of absorption, adsorption, cryogenic distillation, membranes, and gas hydrates.Up to now, high-performance adsorbents have been widely used for CO 2 capture. Conventional solid adsorbents include zeolites [11], activated carbon [12], mesoporous silica [13], metal oxide-based adsorbents (e.g., MgO and CaO) [14], and metal-organic frameworks (MOFs) [15]. Nevertheless, in each case, there are defects in the adsorption process. Zeolites and mesoporous silica have the drawback of poor CO 2 capture performance. With zeolites, adsorption of moisture could affect the stability of the zeolite frameworks, and demands high regeneration temperature (>573 K). This results in huge energy consumption for CO 2 desorption. Meanwhile, although the adsorption capacity for CO 2 of activated carbon is high due to pore sizes ranging from micr...

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KOH-activated graphite nanofibers as CO₂adsorbents

Yuan¹,

Meng²,

Park³

2016

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“…SWCNTs were produced in a post-flame region of a premixed flame of acetylene/oxygen/15 mol% Ar at 6.7 kPa in the presence of Fe(CO) 5 as a catalyst. The yield was analyzed at various heights above the burner (HAB) by using thermophoretic sampling and TEM.…”

Section: Premixed Flame Synthesismentioning

confidence: 99%

“…Carbonaceous structures are employed in a wide range of applications because of their outstanding mechanical, electrical, and thermal properties [1][2][3][4]. Over the last few decades, the development of novel carbonaceous structures, such as active carbon [5,6], carbon nanotubes (CNTs) or carbon nanofibers (CNFs) [7][8][9][10], carbon spheroids [11], carbon onions [12], fullerenes [13], and glassy carbon [14] have attracted much scientific interest. Among these structures, CNTs are the most relevant because their unique arrangement of carbon atoms produces remarkable properties, such as high aspect ratio, young's modulus, and conductivity [15][16][17].…”

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Carbon nanotubes synthesis using diffusion and premixed flame methods: a review

Mittal¹,

Dhand²,

Rhee³

et al. 2015

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In recent years, flame synthesis has absorbed a great deal of attention as a combustion method for the production of metal oxide nanoparticles, carbon nanotubes, and other related carbon nanostructures, over the existing conventional methods. Flame synthesis is an energyefficient, scalable, cost-effective, rapid and continuous process, where flame provides the necessary chemical species for the nucleation of carbon structures (feed stock or precursor) and the energy for the production of carbon nanostructures. The production yield can be optimized by altering various parameters such as fuel profile, equivalence ratio, catalyst chemistry and structure, burner configuration and residence time. In the present report, diffusion and premixed flame synthesis methods are reviewed to develop a better understanding of factors affecting the morphology, positioning, purity, uniformity and scalability for the development of carbon nanotubes along with their correlated carbonaceous derivative nanostructures.

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A study on elemental mercury adsorption behaviors of nanoporous carbons with carbon dioxide activation

Cited by 2 publications

References 30 publications

KOH-activated graphite nanofibers as CO₂adsorbents

KOH-activated graphite nanofibers as CO₂adsorbents

Carbon nanotubes synthesis using diffusion and premixed flame methods: a review

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A study on elemental mercury adsorption behaviors of nanoporous carbons with carbon dioxide activation

Cited by 2 publications

References 30 publications

KOH-activated graphite nanofibers as CO2adsorbents

KOH-activated graphite nanofibers as CO2adsorbents

Carbon nanotubes synthesis using diffusion and premixed flame methods: a review

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KOH-activated graphite nanofibers as CO₂adsorbents

KOH-activated graphite nanofibers as CO₂adsorbents