Influence of Organics on the Structure of Water Adsorbed on Activated Carbons

Туров, В.В.; Gun'ko, V.М.; Лебода, Р.; Bandosz, Teresa J.; Skubiszewska–Zięba, J.; Palijczuk, D.; Tomaszewski, Waldemar; Ziętek, S.

doi:10.1006/jcis.2002.8547

Cited by 47 publications

(40 citation statements)

References 55 publications

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“…1). Therefore, these structural changes can be neglected on the calculations of changes in the Gibbs free energy of adsorbed water (γ S and differential G s ) determined using calibration function and assuming that G s of frozen interfacial water is equal to that of ice at the same T (Turov et al, 2002). Dependences of the 1 H NMR signal intensity of unfrozen adsorbed water and changes in the Gibbs free energy on the amount of unfrozen water (C ufw ) (total amount of adsorbed water was constant C H 2 O = 130 mg per gram of carbon corresponding to 16% of V p ) were studied in the gas phase or with added organics (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…by H 2 applied to carbon Norit affect micropores to a greater extent than mesopores (nitrogen adsorption using a Micromeritics ASAP 2405N analyzer). CD 3 CN, (CD 3 ) 2 CO, (CD 3 ) 2 SO, CCl 4 , CDCl 3 , and C 6 D 6 used in the deuterium form to avoid their contribution to the 1 H NMR signal intensity of unfrozen water at T < 273 K (WP-100 SY (Bruker) NMR spectrometer) (Turov et al, 2002). These compounds were calculated using quantum chemistry methods with consideration for the solvation effects (Xidos et al, 2002) ( Table 2).…”

Section: Methodsmentioning

confidence: 99%

“…Certain aspects of these effects are unclear (Leboda * To whom correspondence should be addressed. Turov et al, 2002;Gun'ko et al, 2003Gun'ko et al, , 2004. Therefore the aim of this work is to elucidate the influence of organics (polar or nonpolar, non-aromatic or aromatic, and soluble or insoluble in water) on the characteristics of water adsorbed on several adsorbents using adsorption, 1 H NMR with freezing-out of water, thermal gravimetry, breakthrough dynamics, and quantum chemical methods.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Organics on Structure of Water Adsorbed on Activated Carbons

et al. 2005

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Influence of organics on the properties of water adsorbed on carbon and silica gel adsorbents was studied by 1 H NMR spectroscopy, thermal gravimetry, breakthrough dynamics, and quantum chemistry methods. Te behavior of interfacial water depends strongly on the properties of organic solvents, which can remove a major (nonpolar solvents) or minor (polar solvents) portion of water from narrow pores to larger ones of carbon adsorbents. The opposite effect is observed on the interaction of water/organics with silica gel.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Organics on Structure of Water Adsorbed on Activated Carbons

et al. 2005

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“…Certain carbon samples were studied by 1 H NMR method (using a high-resolution WP-100 SY (Bruker) NMR spectrometer) with freezing-out of adsorbed water (Turov et al, 2002) and by adsorption of organics. The nitrogen adsorption-desorption isotherms were analyzed using an overall isotherm equation based on the modified Kelvin equation and the statistical adsorbed film thickness with a regularization procedure (Gun'ko and Do, 2001) to compute the pore size distributions both differential f (x) and incremental (IPSD) (Gun'ko and Mikhalovsky, 2004).…”

Section: Carbonmentioning

confidence: 99%

Investigation of Structural and Adsorptive Characteristics of Various Carbons

et al. 2005

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Structural and adsorption properties of carbon sieves, activated carbons and graphitized carbon blacks were studied using adsorption of nitrogen, water, and high molecular organics. Several types of pore models were used to study the pore size distributions (PSD) of the adsorbents. The interfacial behavior of water adsorbed in the presence of organics depends on both the surface chemistry of an adsorbent, its structure and the characteristics of organics. A smaller size (1-10 µm) of particles of microporous Carboxen 1010 than that of Carboxen 1003 (150-200 µm) provides initially faster adsorption of lipopolysaccharide (LPS) molecules by the first carbon. However, the LPS adsorption on micro/meso/macroporous Carboxen 1003 becomes greater with time since this carbon has broad pores appropriate in size for the adsorption of large biopolymer molecules in contrast to Carboxen 1010, which adsorbs LPS mainly on the outer surface of the particles.

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“…The effects of modification of commercial and synthetic (prepared from organic polymers) ACs are compared. It should be noted that only few works, published earlier, were devoted to HTT of carbon materials (under suband supercritical conditions) with the purpose of modification of their porous and surface structure (Nieh and Grow 1987;Matsumura et al 1997;Turov et al 2002). Authors of these investigations were found the changes of porous structure parameters in hydrothermal conditions and suggested that observed changes are caused by gasification of carbon.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal modification of carbon adsorbents

et al. 2011

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The effects of high-pressure autoclave treatments on porous structure and surface properties were studied for a variety of activated carbons (AC, synthetic and produced from plum stones) treated with water vapour, hydrogen peroxide (10-50%) or 10% aqueous ammonia solution at relatively low temperatures (250, 350, 400 • C). Surface and structural parameters of modified ACs were determined using nitrogen, water, ammonia and benzene adsorption isotherms. It was found that the effects of AC modification resulting in changes in their porous structure and surface chemistry depend on the kind of initial ACs, modifier type and concentration of modifier and treatment temperature. At the same conditions synthetic ACs are modified to a larger extent than ACs prepared using natural raw materials. Repeated treatment of a given carbon intensifies changes in its porous structure.

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Influence of Organics on the Structure of Water Adsorbed on Activated Carbons

Cited by 47 publications

References 55 publications

Influence of Organics on Structure of Water Adsorbed on Activated Carbons

Influence of Organics on Structure of Water Adsorbed on Activated Carbons

Investigation of Structural and Adsorptive Characteristics of Various Carbons

Hydrothermal modification of carbon adsorbents

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