Adsorption of aliphatic, alicyclic, and aromatic hydrocarbons on poly(ethylvinylbenzene-divinylbenzene) adsorbent at from effective zero to finite adsorbate surface coverage

Djordjevic, Nebojša M.; Laub, R. J.; Kopečni, M. M.; Milonjić, Slobodan K.

doi:10.1021/ac00298a028

Cited by 19 publications

(11 citation statements)

References 44 publications

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“…With increasing adsorbed amount, isosteric heat of adsorption generally decreases steadily with increasing coverage, asymptotically approaching the respective heat of evaporation, D vap H 0 . [33,46] However, a slight increase in isosteric heat of adsorption of alkanes with surface coverage was found for zeolites. [46] This discrepancy can be attributed to surface heterogeneity, attractive adsorbateadsorbate interactions, changing the structure of the adsorbed phase or the existence of chemisorption in the adsorbateadsorbent system.…”

Section: Adsorbatementioning

confidence: 99%

“…Adsorption Isotherms and Specific Surface Area IGC at finite coverage conditions has been used for the determination of adsorption isotherms of decane and hexanol on poly(methyl methacrylate) and polystyrene, [32] hexane, heptane, cyclohexane, benzene, carbon tetrachloride and acetone on poly(ethylvinylbenzene-co-divinylbenzene) [33] and hexane, pyridine, tetrachloromethane and 1,2-dichloroethane on macroporous poly(styrene-co-divinylbenzene). [1] The adsorption of hexane, chloroform, benzene and tetrahydrofuran, representing non-polar, acid, aromatic and basic organics, respectively, has been used to study the surface characteristics of chromia.…”

Section: Data Reductionmentioning

confidence: 99%

“…[33] The isosteric heat of adsorption for hexane, chloroform, THF and benzene, as a function of surface coverage on poly(GMA-co-EGDMA) and poly(GMA-co-EGDMA)-en samples, was calculated from Equation (7) and is presented in Figure 2.…”

Section: Isosteric Heat Of Adsorptionmentioning

confidence: 99%

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Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

Nastasović¹,

Onjia²,

Milonjić³

et al. 2005

Macro Materials & Eng

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Summary: Inverse gas chromatography under finite surface coverage conditions (IGC‐FC) was used for the investigation of sorption of hexane, benzene, chloroform and tetrahydrofuran on macroporous crosslinked poly[(glycidyl methacrylate)‐co‐(ethylene glycol dimethacrylate)], poly(GMA‐co‐EGDMA), and copolymer modified with ethylene diamine, EDA, poly(GMA‐co‐EGDMA)‐en, in the temperature range 333–363 K. Two poly(GMA‐co‐EGDMA) samples with different porosity parameters were synthesized by suspension copolymerization and modified using a ring‐opening reaction of the pendant epoxy groups with EDA. The specific surface areas of the initial and modified copolymer samples were determined by the BET method from low temperature nitrogen adsorption isotherms (77 K). The adsorption isotherms determined from chromatographic peaks of adsorbates were analyzed using the BET theoretical model and used for estimation of the surface area, isosteric heat of adsorption and the adsorption energy distribution on the surface of the initial and modified copolymer samples. It was observed that the adsorbate nature and the properties of the solid surface of the initial and modified copolymer governed the uptake of adsorbate by the copolymer. The deviations observed for the Sa values obtained by the BET method from the low temperature nitrogen adsorption isotherms and hexane was attributed not only to the difference in molecule size, but also to the specific polymer‐adsorbate interactions. The isosteric heat of adsorption approached a constant value with increasing adsorbate loading. A large variation in the shapes of the qst‐α curves resulted from strong acid‐base interactions, as well as dissolution phenomena. Of the four studied adsorbates, chloroform was shown to have the greatest affinity towards the surface of the investigated polymer samples.Adsorption isotherms of hexane on sample 1 and 1a.magnified imageAdsorption isotherms of hexane on sample 1 and 1a.

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Section: Adsorbatementioning

confidence: 99%

Section: Data Reductionmentioning

confidence: 99%

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Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

Nastasović¹,

Onjia²,

Milonjić³

et al. 2005

Macro Materials & Eng

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“…Lower residual uptake is achieved with DOWEX-1 and the non-specific adsorbent, PORAPAK Q, commonly used in gas-solid chromatography. Both adsorbents usually [8] have specific surface areas of up to 200 m^/g. The lowest adsorption is found for ZrP-1, for which the manufacturer Usts only 1.7 m^/g.…”

Section: Adsorptionmentioning

confidence: 99%

Further Inyestigations on the Iodine Species Formed in the Nitric Acid/Nitric Oxide System

et al. 1992

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An attempt to isoiate and identify organic impurities and residual iodine formed in hot 2.89 mol/1 nitric acid sparged with nitric oxide has been made. Numerous techniques (GC, GC/MS/ FTIR, NMR and IR combined with adsorption and extraction experiments) were used for the purpose. Organic impurities contained in the acid undergo nitration processes in the highly aggressive nitric acid/NO, media. It was shown that the total amount of organic impurities in the system is higher than expected. The iodinated Compounds amount to probably less than 1% of the total organics and escape an unambiguous positive identification. The main organic components are branched saturated hydrocarbons substituted with NO2 or NO3 groups.

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“…IGC is an efficient method to evaluate the surface properties of various materials such as natural materials [4][5][6], polymers [7][8][9][10][11][12][13][14][15][16][17][18], carbons [19][20][21][22][23][24][25][26][27][28], and inorganic oxides [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. However, it is recently reported that IGC has some limitations for the determination of acid-base properties of solid surfaces [47].…”

Section: Introductionmentioning

confidence: 99%

Surface free energies of silica fillers and their relation to the adsorption of poly(ethylene terephthalate)

Kimura

Nakamura

Tsutsumi

2004

Journal of Colloid and Interface Science

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Adsorption of aliphatic, alicyclic, and aromatic hydrocarbons on poly(ethylvinylbenzene-divinylbenzene) adsorbent at from effective zero to finite adsorbate surface coverage

Cited by 19 publications

References 44 publications

Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

Further Inyestigations on the Iodine Species Formed in the Nitric Acid/Nitric Oxide System

Surface free energies of silica fillers and their relation to the adsorption of poly(ethylene terephthalate)

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