Adsorption of Polyacrylamide and Sulfonated Polyacrylamide on Na-Kaolinite

Hollander, A. F.; Somasundaran, P.; Gryte, Carl C.

doi:10.1007/978-1-4613-3264-0_7

Cited by 7 publications

(3 citation statements)

References 24 publications

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“…The obtained isotherms were fitted into the modified form of the Freundlich single solute isotherm, which has the following equation: − where q e is the amount of EMA adsorbed per unit gram of adsorbent, A e is the amount of the EMA at equilibrium (calculated from the concentration and volume) per unit weight of the adsorbent, K f is considered as the capacity factor, and the exponential term n represents the heterogeneity of the site energies and is related to the magnitude of the adsorption driving force. The fitting range was from 1 to 200 mg EMA/g carbon.…”

Section: Methodsmentioning

confidence: 99%

Role of Surface Oxygen Groups in Incorporation of Nitrogen to Activated Carbons via Ethylmethylamine Adsorption

Elsayed

Bandosz

2005

Langmuir

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Coal origin and wood origin activated carbons were used in this study. To broaden the spectrum of surface features, the surface of the initial samples was modified using oxidation with nitric acid or impregnation with urea followed by heat treatment. Boehm and potentiometric titrations, thermal analysis, and sorption of nitrogen were used to characterize the pore structure and surface chemistry. Then adsorption of ethylmethylamine from aqueous solutions was carried out without controlling the pH of the carbon suspension. The isotherms were measured at 299 K and fitted to the Freundlich equation. The results showed that the amount of ethylmethylamine adsorbed on all carbons at a high concentration is dependent on the total number of surface groups whereas at low concentration it depends on the type of surface groups. The latter was observed exclusively for initial and oxidized carbons where acidic groups are present. The ethylmethylamine adsorption is mainly governed by dipole-dipole, hydrogen bonding, or specific acid-base interactions. Those interactions play a crucial role in incorporation of nitrogen to the carbon matrix at elevated temperatures.

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Section: Methodsmentioning

confidence: 99%

Role of Surface Oxygen Groups in Incorporation of Nitrogen to Activated Carbons via Ethylmethylamine Adsorption

Elsayed

Bandosz

2005

Langmuir

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“…A high degree of hydration indicates a strong interaction between the particle surface and the aqueous medium, fewer specific bonding sites, and a decrease of the affinity of the polymer for the surface. 8 Rubio and Kitchener 7 have found that an increase in pH increases the hydrophilicity of all the forms of silica investigated, causing a stronger silica-water interaction and reduced adsorption of poly-(ethylene oxide).…”

Section: Introductionmentioning

confidence: 99%

“…4,5 This effect has been observed for poly(vinyl alcohol) and poly(ethylene oxide) adsorption on silica, 2,4,7 polyacrylamide on alumina and titania, 5 and polyacrylamide on kaolin. 8 The extent of hydration of the solid surface influences the interaction of the surface with the polymer. A high degree of hydration indicates a strong interaction between the particle surface and the aqueous medium, fewer specific bonding sites, and a decrease of the affinity of the polymer for the surface.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Hydroxypropyl Methyl Cellulose in an Aqueous System Containing Multicomponent Oxide Particles

Sawyer

Reed

2001

Journal of the American Ceramic Society

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The adsorption behavior of a hydroxypropyl methyl cellulose (HPMC) polymer in aqueous suspensions of alumina, silica, kaolin, and talc powders, two-component combinations, and one three-component combination was determined. Powders were well characterized by chemical analysis, XRD, DRIFT, SEM, particle size, surface area, and density analyses. The zeta-potential of each powder in aqueous suspension was determined over a range of pH to determine particle charging and the isoelectric point for each material. Alumina and silica powders having heavily hydroxylated surfaces were observed not to adsorb the HPMC polymer over a range of pH. The layer-type minerals talc, which was noticeably hydrophobic, and kaolin, which had differently hydrated basal planes, adsorbed the HPMC polymer but in different amounts per unit of surface area. In the two-component systems, HPMC polymer adsorption for systems of dispersed particles of like electrical charge (kaolin ؉ silica, talc ؉ silica or alumina, and kaolin ؉ talc) was proportionate to the sum of the fraction x specific surface area x adsorption capacity for each particle type. In systems where particles had an opposite electrical charge (kaolin ؉ alumina, kaolin ؉ talc ؉ alumina), the HPMC polymer adsorption was significantly lower than that calculated for a dispersed system. SEM analysis showed very fine, nonadsorbing alumina particles predominantly on the faces of the adsorbing kaolin particles that apparently masked polymer adsorption. Results suggested a hydrophobic mechanism for the HPMC polymer adsorption and adsorption on only one face of the kaolin particles.

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Interfacial Properties of Calcium Phosphates

Somasundaran

Marković

1998

Calcium Phosphates in Biological and Industrial Systems

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Adsorption of Polyacrylamide and Sulfonated Polyacrylamide on Na-Kaolinite

Cited by 7 publications

References 24 publications

Role of Surface Oxygen Groups in Incorporation of Nitrogen to Activated Carbons via Ethylmethylamine Adsorption

Role of Surface Oxygen Groups in Incorporation of Nitrogen to Activated Carbons via Ethylmethylamine Adsorption

Adsorption of Hydroxypropyl Methyl Cellulose in an Aqueous System Containing Multicomponent Oxide Particles

Interfacial Properties of Calcium Phosphates

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