Comparative Study of Active Carbons from Different Precursors

Bóta, Attila; László, Krisztina; Nagy, Lajos; Copitzky, Thomas

doi:10.1021/la9700883

Cited by 62 publications

(35 citation statements)

References 69 publications

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“…Granular activated carbon (APET) was prepared from poly(ethylene terephthalate) (PET) pellets (Bóta et al 1997). Steam-activated carbon, obtained at 900°C, was treated for 3 hours with concentrated nitric acid at room temperature (APETA) and at the boiling point of the carbon-acid suspension (APETB) to achieve different degrees of surface functionalization.…”

Section: Methodsmentioning

confidence: 99%

Water vapour adsorption and contrast-modified SAXS in microporous polymer-based carbons of different surface chemistry

2008

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The adsorption of water vapour on highly microporous activated carbons with different surface chemistry is investigated by small angle X-ray scattering (SAXS) as well as by adsorption isotherms. The water changes the intensity of the SAXS in a way that depends on how the pores are filled. With wetting liquids such as hexane, a pseudo binary model can be assumed in which pore-filling in reciprocal space q is described by a density function p(q). For water, clusters develop, even in the most oxidized carbon, creating a fully ternary system. In the Porod scattering region, however, the final slope is insensitive to the liquid-vapour interfaces. In this region, for the less oxidized samples, p(q) shows reasonable agreement with the adsorption isotherms. At low relative pressure P /P 0 , however, the SAXS results indicate a small degree of filling (about 10%) that is not reflected in the isotherms. The highly oxidized sample attains a degree of filling of about 70% that, unlike the corresponding isotherm, is constant for P /P 0 > 0. These differences may be due to kinetic effects and/or ageing, involving either redistribution of the water molecules or modifications of the surface groups.

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Section: Methodsmentioning

confidence: 99%

Water vapour adsorption and contrast-modified SAXS in microporous polymer-based carbons of different surface chemistry

2008

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“…The second peak (C) is situated near 25 degrees, is higher and narrower, and indicates the presence of crystallinity. The equation used is: (6) where I C is the integrate of peak C, I A is the integrate of peak A, and K is a constant.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…This angular range contains information about pores in activated carbon (Bóta et al, 1997). This technique yields information about physical structure, as XRD, but not about composition, as XPS.…”

Section: Small-angle X-ray Scattering (Saxs)mentioning

confidence: 99%

Techniques Employed in the Physicochemical Characterization of Activated Carbons

Durán‐Valle¹

2012

Lignocellulosic Precursors Used in the Synthesis of Activated Carbon - Characterization Techniques and Applications in the Wast

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“…The It is well-known that porous materials such as active carbon, Vycor glass and aerogels have fractal geometry with limited size-scale over only one decade or less around 10 nm [26][27][28][29].…”

Section: Effects Of T Cal and R C For Porous Structure And Fractal Gementioning

confidence: 99%

Characterization and structural investigation of fractal porous-silica over an extremely wide scale range of pore size

Ono

Mayama

Furó

et al. 2009

Journal of Colloid and Interface Science

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We have succeeded in creating Menger sponge-like fractal body, i.e., porous-silica samples with Menger sponge-like fractal geometries, by a novel template method utilizing template particles of alkylketene dimer (AKD) and a sol-gel synthesis of tetramethyl orthosilicate (TMOS). We report here the first experimental results on characterization and structural investigations of the fractal porous-silica samples prepared with various conditions such as calcination temperature and packing condition of the template particles. In order to characterize the fractal porous-silica samples, pore volume distribution, porosity and specific surface area were measured over an extremely wide scale from 1 nm to 100 m by means of mercury porosimetry, 1 H NMR cryoporometry, and nitrogen gas adsorption experiments together with direct evaluations of cross-sectional fractal dimension D cs , size limits of D cs . We have found that the pore volume distribution and specific surface area of the fractal porous-silica samples can be discussed in terms of different fractal porous structures at different scale regions.

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Comparative Study of Active Carbons from Different Precursors

Cited by 62 publications

References 69 publications

Water vapour adsorption and contrast-modified SAXS in microporous polymer-based carbons of different surface chemistry

Water vapour adsorption and contrast-modified SAXS in microporous polymer-based carbons of different surface chemistry

Techniques Employed in the Physicochemical Characterization of Activated Carbons

Characterization and structural investigation of fractal porous-silica over an extremely wide scale range of pore size

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