Interaction of amphetamine and its N-alkyl-substituted derivatives with micro- and mesoporous adsorbents in polar liquids

Tomaszewski, Waldemar; Gun'ko, V.М.; Лебода, Р.; Skubiszewska–Zięba, J.

doi:10.1016/j.jcis.2004.08.123

Cited by 12 publications

(6 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6) because of an increase in the number of acidic surface sites (Tomaszewski et al 2005;Seredych and Bandosz 2007a;Seredych and Bandosz 2007b). The amounts of these groups increase much more significantly on the carbon treated with hydrogen peroxide than with water (Fig.…”

Section: Resultsmentioning

confidence: 96%

“…Hydrothermal modification of A2PS and SCN reduces their energetic heterogeneity to some extent. This kind of treatment was earlier applied to change the AC surface chemistry but at minimal change in the porous structure (Tomaszewski et al 2005) that allowed studying the effect of chemical heterogeneity of the AC surface on the mechanism of amphetamines adsorption. It was found that only a portion of the surface of oxidized carbons was accessible for the adsorbed probe compounds.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hydrothermal modification of carbon adsorbents

et al. 2011

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Hydrothermal modification of carbon adsorbents

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…1a) was used as received. Notice that according to Merck' information [33] and some publications [8], LiChrolut EN adsorbent (orange) is composed of poly(ethylvinylbenzene divinylbenzene); however, according to other publications [34][35][36][37], it is a PSDVB co-polymer, and there is not information on oxygen-containing functionalities and their origin in the adsorbent [6][7][8][9][10]. According to these publications, the specific surface area of the adsorbent is 1200-1300 m 2 /g and the pore volume is 0.75-0.8 cm 3 /g.…”

Section: Methodsmentioning

confidence: 99%

“…LiChrolut EN adsorbent was selected from PSDVB and other polymer adsorbents studied previously [27] due to its large specific surface area and pore volume (Table 1), stable pore structure (which was not practically changed in contrast to other polymer adsorbents on treatment in water or acetone for 24 h and then freezing in liquid nitrogen for 2 h before repeated nitrogen adsorption-desorption measurements), the adsorbent stability over a wide pH range of the solution, and its high effectiveness as a SPE material [6][7][8][9][10]. The textural and structural stability of LiChrolut EN adsorbent is of importance because the adsorbent with adsorbed water and water/organics was frozen at low temperatures on the TSDC and 1 H NMR measurements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural features of polymer adsorbent LiChrolut EN and interfacial behavior of water and water/organic mixtures

Gun'ko¹,

Туров²,

Zarko³

et al. 2008

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Competitive adsorption

Gun’ko

2007

Theor Exp Chem

View full text Add to dashboard Cite

UDC 541.183 V. M. Gun'koA review is presented on the multicomponent competitive adsorption, static equilibrium adsorption, and dynamic nonequilibrium adsorption from gaseous and liquid media onto the surface of porous and disperse solids. The state of the theory of multicomponent adsorption is analyzed. Not only traditional methods were used for investigations in this field but also NMR spectroscopy (difference in the spectra of adsorbed and free compounds), FTIR spectroscopy (difference in the spectra of surface groups and bonds in adsorbates), calorimetry, thermally stimulated depolarization, photon correlation spectroscopy, electrophoresis, and cryoporometry.corresponding polymers. We should note that the effect of the conditions of both equilibrium (static) and nonequilibrium (dynamic) adsorption is greater in competitive adsorption since the adsorbates may differ considerably in their rate of diffusion, kinetics and free energy of adsorption, nature of interaction both with the surface (monodentate, bidentate, and polydentate adsorption) and the medium, and in their concentration. On the whole, competitive adsorption leads to a reduced rate of reaching equilibrium. Preadsorption or a higher diffusion rate gives a momentary advantage to the first or more mobile adsorbate, which is most evident in dynamic adsorption and less so in equilibrium adsorption. The time to reach equilibrium in the case of preadsorption or concurrent competitive adsorption may be different but it is greater than in the individual adsorption of the same compounds.There are two approaches to the description of competitive adsorption involving additive and nonadditive models. In the former case, the adsorption of the i-th adsorbate is seen as the adsorption of an individual compound taking account of its partial pressure or concentration, in which the parameters of the adsorbent such as adsorption capacity are redetermined taking account of the adsorption of other adsorbates. We use fitting or additional parameters such as activity coefficients in these models [11]. In the case of nonadditive models, adsorption is described by a system of related equations, determining the corresponding parameters using different variants for uncoupling equations and iterative self-consistency of their solutions. Special program packages have been developed for analyzing the data for multicomponent mixtures. Thus, for example, the TMVOC package [25] (similar to the TOUGH2 or T2VOC packages) was developed at the Berkeley National Laboratory in the United States for modeling systems involving a nonisothermal water flow, soil gas, and a mixture of volatile organic compounds in a heterogeneous porous medium. The 3DHYDROGEOCHEM package was developed by the Environmental Protection Agency in the United States for analogous purposes. These packages are applicable both for "natural" environmental conditions and engineering systems.On the whole, there have been many studies of multicomponent adsorption but nevertheless less than for the adsorption of individual c...

show abstract

Interaction of amphetamine and its N-alkyl-substituted derivatives with micro- and mesoporous adsorbents in polar liquids

Cited by 12 publications

References 41 publications

Hydrothermal modification of carbon adsorbents

Hydrothermal modification of carbon adsorbents

Structural features of polymer adsorbent LiChrolut EN and interfacial behavior of water and water/organic mixtures

Competitive adsorption

Contact Info

Product

Resources

About