Surface Properties of Mesoporous Carbon–Silica Gel Adsorbents

Лебода, Р.; Туров, В.В.; Charmas, B.; Skubiszewska–Zięba, J.; Gun'ko, V.М.

doi:10.1006/jcis.1999.6629

Cited by 42 publications

(14 citation statements)

References 70 publications

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“…adsorption (Leboda et al 2000a;Yanishpolski et al 2000), electric (Leboda et al 1995a) electrochemical (Gun'ko et al 2000), SEM, TEM (Tracz et al 1984; Leboda and Łodyga 1988;Gun'ko et al 2001), 1 H NMR (Turov et al 1995;Turov and Leboda 1999), etc. Despite these investigations, the relationships between the structural characteristics of different phases of hybrid adsorbents and their influence on adsorption of polar and nonpolar compounds are still important.…”

Section: Introductionmentioning

confidence: 98%

“…These materials can be also used for isolation and concentration of trace amounts of the substances contained in water, e.g. p-nitrophenol (Leboda et al 2000a), phenol , heavy metal ions (Seledets et al , 2006 and in other media (air pollutions) (Ansari et al 2005). Additionally they are the potential polymer fillers and condensation agents (Krysztafkiewicz et al 2005).…”

Section: Introductionmentioning

confidence: 98%

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Structural and energetic properties of carbosils hydrothermally treated in the classical autoclave or the microwave reactor

Skubiszewska–Zięba

2008

Adsorption

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Carbon/silica adsorbents (carbosils) prepared by pyrolysis of CH 2 Cl 2 at 823 K and the reaction time from 0.5 to 6 h on the mesoporous silica gel surface (Si-60, Merck, granule size 0.2-0.5 mm) and then hydrothermally treated at 473 K with steam or liquid water by using the classical autoclave with traditional heating way or in the microwave reactor were studied by means of TG, adsorption and Q-TG methods. Changes in the structural characteristics of hybrid adsorbents before and after hydrothermal treatment were analyzed on the basis of nitrogen adsorption. Thermal properties of initial and modified samples as well as concentration of carbon deposit were studied using thermogravimetry (TG) in the range of 293-1273 K. The adsorbed water layers were investigated by means of thermodesorption of water under the quasi-isothermal conditions (Q-TG) in the range of 293-573 K. Concentration of weakly and strongly adsorbed water and the surface free energy on the interphase of adsorbent/water were calculated. It was stated that hydrothermal treatment in the microwave reactor, contrary to that in the classical autoclave, allows to obtain adsorbents with noticeably higher values of total pore volume in relation to the initial adsorbents and in majority with a higher specific surface area. Application of microwave energy allows to obtain adsorbents with lower values of surface free energy in relation to the initial adsorbents and those modified in the autoclave.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Structural and energetic properties of carbosils hydrothermally treated in the classical autoclave or the microwave reactor

Skubiszewska–Zięba

2008

Adsorption

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“…This equation allows evaluating the pore fractal dimension (22)(23)(24)(25)(28)(29)(30)(31)(32)(33)(34)(35). The overall adsorption isotherm should be integrated in this case in the micropore region (x min , x max ), where x min and x max are the lower and upper limit of fine pores in which adsorption occurs by a micropore filling mechanism (25,31,36).…”

Section: Introduction and Theoreticalmentioning

confidence: 99%

“…Although different shapes of MSD functions have been proposed for microporous carbons, some experimental findings show that the monotonically decreasing ones (i.e., generating shapes similar to those of the Pfeifer-Avnir equation) are possible (for example: DFT method, Terzyk et al (37); the enthalpies of immersion, Kraehenbuehl et al (38); and the STM analysis, Stoeckli (39)). Moreover, the adsorption isotherm equation developed on the basis of DA isotherm and Pfeifer-Avnir MSD was found to be very useful for characterizing the heterogeneity of some carbonaceous materials (22)(23)(24)(25)(28)(29)(30)(31)(32)(33)(34)(35). The starting micropore size distribution function y(t) (where the variable t denotes the slit-pore half-width x or the structural parameter B) can be written in the two equivalent general forms (36),…”

Section: Introduction and Theoreticalmentioning

confidence: 99%

The Comparative Analysis of the Properties of Two Micropore-Size Distribution Functions: The Pfeifer–Avnir Function and the Gamma-Type One

Gauden¹,

Terzyk²,

Rychlicki³

et al. 2001

Journal of Colloid and Interface Science

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“…Promising materials, due to the dual nature of the surface, are carbonsilica adsorbents (carbosils) [1,2]. These hybrid materials combine characteristics of the non-polar carbon and polar mineral matrix, allowing adsorption of both polar and nonpolar media [2][3][4][5][6][7]. Properties of carbosils can be controlled and monitored in the stage of preparation, by choosing appropriate mineral matrix, adjusting amount and chemical nature of carbon deposit precursors, different modification ways and/or catalyst addition.…”

Section: Introductionmentioning

confidence: 99%

Structural and thermal characteristics of Ni-doped carbosils prepared by mechanochemistry

Charmas

2015

J Therm Anal Calorim

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The paper presents the effects of differentiation of initial matrix (silica gel Si-50 or Aerosil A-200) and the addition of Ni 2? ions (in the form of Ni(NO 3 ) 2 Á6H 2 O) on structural and thermal properties of carbosils prepared by mechanochemical deposition of carbon matter (potato starch). Porous structure of the initial and modified materials was characterized by the low-temperature nitrogen adsorption/desorption method as well as by PSD calculated from the calorimetric data (DSC) using the thermal effects of phase transitions of water confined in carbosil pores. To evaluate comprehensive properties of the samples, the thermogravimetric (TG, DTG and DTA), spectroscopic (XRD, FTIR/ATR) and microscopic (SEM) investigations were carried out. It was found that mechanochemistry is an appropriate method for rebuilding the porous structure of silicas as well as for homogeneous deposition of carbon matter and catalyst on the silica matrices. It has been shown the nickel doping causes pore volume increase and lowering of carbon deposit thermal stability. The obtained carbosils are mesoporous materials with a small amount of micropores created in the carbon part.

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Surface Properties of Mesoporous Carbon–Silica Gel Adsorbents

Cited by 42 publications

References 70 publications

Structural and energetic properties of carbosils hydrothermally treated in the classical autoclave or the microwave reactor

Structural and energetic properties of carbosils hydrothermally treated in the classical autoclave or the microwave reactor

The Comparative Analysis of the Properties of Two Micropore-Size Distribution Functions: The Pfeifer–Avnir Function and the Gamma-Type One

Structural and thermal characteristics of Ni-doped carbosils prepared by mechanochemistry

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