Preparation of Activated Carbons with Large Specific Surface Areas from Biomass Corncob and Their Adsorption Equilibrium for Methane, Carbon Dioxide, Nitrogen, and Hydrogen

Abstract: Kinetics and isotherms of Reactive Blue 19 adsorption on two kinds of granular activated carbons from coconut shell and bamboo were determined in this study. These activated carbon are micropore materials with specific surface areas of 687 and 425 m2/g, respectively. Experimental data shows that equilibrium times are the same for both kinds of activated carbon when ininital concentration of the dye is 40 mg/L. However, maximum absorption capacity of bamboo activated carbon is about 10 times higher than that of coconut shell. This results reveals that adsorption site density on the surface plays a more important role than specific surface area.

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Reactivity of Coke. II. Effects of Heat Treatment of Cokes on Their Specific Surface Areas and Absolute Specific Reaction Rates with Carbon Dioxide at 950°C

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.27.334 ◽

1954 ◽

Vol 27 (6) ◽

pp. 334-339 ◽

Cited By ~ 2

Author(s):

Yoshio Kawana

Keyword(s):

Carbon Dioxide ◽

Heat Treatment ◽

Specific Surface ◽

Reaction Rates ◽

Specific Reaction ◽

Surface Areas ◽

Specific Surface Areas

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Construction of Oxygen-Rich Carbon Foams for Rapid Carbon Dioxide Capture

Materials ◽

10.3390/ma14010173 ◽

2020 ◽

Vol 14 (1) ◽

pp. 173

Author(s):

Cheng Duan ◽

Wei Zou ◽

Zhongjie Du ◽

Jianguo Mi ◽

Jiaxi Han ◽

...

Keyword(s):

Carbon Dioxide ◽

Specific Surface ◽

Oxygen Content ◽

Total Pore Volume ◽

Micropore Volume ◽

Surface Areas ◽

Oil In Water ◽

Carbon Foams ◽

Specific Surface Areas ◽

Carbon Dioxide Co2

As carbon dioxide (CO2) adsorbents, porous materials with high specific surface areas and abundant CO2-philic groups always exhibit high CO2 capacities. Based on this consensus, a category of oxygen-rich macroporous carbon foams was fabricated from macroporous resorcinol-formaldehyde resins (PRFs), which were obtained via an oil-in-water concentrated emulsion. By the active effect of potassium hydroxide (KOH) at high temperatures, the resultant carbon foams (ACRFs) possessed abundant micropores with rich oxygen content simultaneously. At the same time, most of the ACRFs could retain the marcoporous structure of their precursor. It is found that porosity of ACRFs was mainly determined by carbonization temperature, and the highest specific surface areas and total pore volume of ACRFs could reach 2046 m2/g and 0.900 cm3/g, respectively. At 273 K, ACRFs showed highest CO2 capacity as 271 mg/g at 1 bar and 91.5 mg at 15 kPa. Furthermore, it is shown that the ultra-micropore volume was mainly responsible for the CO2 capacities of ACRFs at 1 bar, and CO2 capacities at 15 kPa were mainly affected by the oxygen content. It is also found that the presence of macropores would accelerate ACRFs adsorbing CO2. This study provides ideas for designing a porous CO2 adsorbent.

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Activated Carbons from Hydrochars Prepared in Milk

Scientific Reports ◽

10.1038/s41598-019-53361-5 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 2

Author(s):

Salwa Haj Yahia ◽

Kian Keat Lee ◽

Brahim Ayed ◽

Niklas Hedin ◽

Tamara L. Church

Keyword(s):

Specific Surface ◽

Activated Carbons ◽

Aqueous Suspension ◽

Hydrothermal Carbonization ◽

Normal Range ◽

Surface Areas ◽

Aliphatic Carbon ◽

Mineral Components ◽

Waste Milk ◽

Specific Surface Areas

AbstractHydrothermal carbonization converts organics in aqueous suspension to a mixture of liquid components and carbon-rich solids (hydrochars), which in turn can be processed into activated carbons. We investigated whether milk could be used as a medium for hydrothermal carbonization, and found that hydrochars prepared from milk, with or without an added fibrous biomass, contained more carbon (particularly aliphatic carbon), less oxygen, and more mineral components than those prepared from fibrous biomass in water. Activated carbons produced from hydrochars generated in milk had lower specific surface areas and CO2 capacities than those from hydrochars formed in water; however, these differences disappeared upon normalizing to the combustible mass of the solid. Thus, in the context of N2 and CO2 uptake on activated carbons, the primary effect of using milk rather than water to form the hydrochar precursor was to contribute inorganic mass that adsorbed little CO2. Nevertheless, some of the activated carbons generated from hydrochars formed in milk had specific CO2 uptake capacities in the normal range for activated carbons prepared by activation in CO2 (here, up to 1.6 mmol g−1 CO2 at 15 kPa and 0 °C). Thus, hydrothermal carbonization could be used to convert waste milk to hydrochars and activated carbons.

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Role of pulping process as synergistic treatment on performance of agro-based activated carbons

Royal Society Open Science ◽

10.1098/rsos.190579 ◽

2019 ◽

Vol 6 (7) ◽

pp. 190579 ◽

Cited By ~ 1

Author(s):

Altaf H. Basta ◽

Vivian F. Lotfy ◽

Philippe Trens

Keyword(s):

Specific Surface ◽

High Performance ◽

Activated Carbons ◽

Sorption Properties ◽

Surface Areas ◽

Pseudo Second Order ◽

Specific Surface Areas ◽

The One ◽

Reported Data ◽

The Impact

To recommend the beneficial effect of the pulping process on enhancing agro-wastes as precursors for the production of high-performance activated carbons (ACs), different pulping methods (alkali, sulfite and neutral sulfite) were applied on two available Egyptian agriculture by-products (rice straw and sugar cane bagasse), using the one-step pyrolysis method and H 3 PO 4 activating agent. The adsorption performance of the different prepared ACs was evaluated in terms of Iodine Numbers and their sorption properties for removing the methylene blue (MB) from aqueous solutions. The corresponding sorption processes were also analysed using Lagergren first order, pseudo-second order and intraparticle diffusion models. Data revealed that the applied pulping conditions were effective for removing the non-cellulosic constituents of agro-residues. This was demonstrated by the hydrogen/carbon and oxygen/carbon ratios, thermal stability and IR-measurements of the final pulps. These data were effective on the particular sorption properties of RS and SCB-based ACs. Interestingly, the pulping process is a profound modification of the SCB-based fibres, on which it induced a clear increase of the specific surface areas of the corresponding ACs even though they had an impact on the sorption of MB and iodine. These values are superior to the reported data on agro-based ACs with H 3 PO 4 activators. Pulping processes therefore play a dual role in the sorption properties of ACs. The first important role is the impact on the specific surface areas and the second impact is a profound modification of the surface chemistry of the ACs. Therefore, SCB-based ACs can be seen as an economical breakthrough product, and an alternative to the high-cost commercial ACs for the purification of industrial wastewaters.

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Electrospun structures with controlled specific surface areas and pores

57th International Astronautical Congress ◽

10.2514/6.iac-06-c2.4.07 ◽

2006 ◽

Author(s):

Vasana Maneeratana ◽

Wolfgang M. Sigmund

Keyword(s):

Specific Surface ◽

Surface Areas ◽

Specific Surface Areas

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Ultrafine porous boron nitride nanofibers synthesized via a freeze-drying and pyrolysis process and their adsorption properties

RSC Advances ◽

10.1039/c5ra23426c ◽

2016 ◽

Vol 6 (2) ◽

pp. 1253-1259 ◽

Cited By ~ 42

Author(s):

Jing Lin ◽

Lulu Xu ◽

Yang Huang ◽

Jie Li ◽

Weijia Wang ◽

...

Keyword(s):

Boron Nitride ◽

Specific Surface ◽

Freeze Drying ◽

Adsorption Properties ◽

Pyrolysis Process ◽

Surface Areas ◽

Aspect Ratios ◽

Large Pore ◽

Specific Surface Areas

Ultrafine porous boron nitride nanofibers with high aspect ratios, high specific surface areas and large pore volumes has been synthesized in large quantity via a freeze-drying and post pyrolysis process.

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Experimental Investigation of Coal Dust Wettability Based on Surface Contact Angle

Journal of Chemistry ◽

10.1155/2016/9452303 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8 ◽

Cited By ~ 15

Author(s):

Gang Zhou ◽

Han Qiu ◽

Qi Zhang ◽

Mao Xu ◽

Jiayuan Wang ◽

...

Keyword(s):

Surface Tension ◽

Contact Angle ◽

Specific Surface ◽

Coal Dust ◽

Single Point ◽

Contact Angles ◽

Critical Surface ◽

Volume Percentage ◽

Surface Areas ◽

Specific Surface Areas

Wettability is one of the key chemical properties of coal dust, which is very important to dedusting. In this paper, the theory of liquid wetting solid was presented firstly; then, taking the gas coal of Xinglongzhuang coal mine in China as an example, by determination of critical surface tension of coal piece, it can be concluded that only when the surface tension of surfactant solution is less than 45 mN/m can the coal sample be fully wetted. Due to the effect of particle dispersity, compared with the contact angle of milled coal particle, not all the contact angles of screened coal powder with different sizes have a tendency to increase. Furthermore, by the experiments of coal samples’ specific surface areas and porosities, it can be achieved that the volume of single-point total pore decreases with the gradual decreasing of coal’s porosity, while the ultramicropores’ dispersities and multipoint BET specific surface areas increase. Besides, by a series of contact angle experiments with different surfactants, it can be found that with the increasing of porosity and the decreasing of volume percentage of ultramicropore, the contact angle tends to reduce gradually and the coal dust is much easier to get wetted.

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