Polyelectrolyte Adsorption by Kaolinite

Michaels, Alan S.; Morelos, O.

doi:10.1021/ie50549a029

Cited by 238 publications

(90 citation statements)

References 8 publications

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“…Polyanions are known to be effective flocculants when added to dilute clay suspensions (Michaels, 1954;Bergmann and Fiedler, 1955;Beutelspracher, 1955;Michaels and Morelos, 1955;Packter, 1957;Warkentin and Miller, 1958;LaMer and Smellie, 1960;LaMer and Healy, 1963). Flocculation involves adsorption of the polyanion as well as formation of interparticle bonds.…”

Section: Effect Of Clay-polymer Interactions On Soil~clay Propertiesmentioning

confidence: 99%

Interactions of Clay Minerals with Organic Polymers. Some Practical Applications

Theng

1970

Clays and Clay Minerals

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Section: Effect Of Clay-polymer Interactions On Soil~clay Propertiesmentioning

confidence: 99%

Interactions of Clay Minerals with Organic Polymers. Some Practical Applications

Theng

1970

Clays and Clay Minerals

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“…These are acrylamid~acrylic acid copolymers with the following structure: When applied to petroleum treatment, the degree of hydrolysis y generally ranges from 5 to 30%. These polymers, which have been previously used for flocculati0n (Michaels and Morelos, 1955;Ruehrwein and Ward, 1952), act simultaneously on water viscosity and rock porosity in diluted aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Contribution to the Adsorption Mechanism of Acetamide and Polyacrylamide on to Clays

Stutzmann¹

1977

Clays and Clay Minerals

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Abstrac~While studying the retention of additives used in tertiary recovery of petroleum (waterflooding) on minerals present in a rock reservoir, an investigation has been undertaken into the adsorption mechanism of polyacrylamides on to clays. The adsorption of amides and polyacrylamides takes place exclusively on the external surfaces of the clay particles. The organic molecules are protonated on the surface and adsorbed by ionic forces. There is a linear relationship between the adsorption ratio and the polarizing power of the exchangeable cations of the clay mineral. The adsorption isotherms and the thermal analyses reveal the existence of two adsorption mechanisms: (i) a strong, irreversible adsorption, which corresponds to the formation of a monolayer of chemisorbed molecules, (ii) a more important adsorption of molecules retained by hydrogen bonding, which can be eliminated by heating at low temperature. The retention ratio in the irreversible process, which is practically identical both for acetamide and polyacrylamide, is low (3 mg/g). It depends on the external cation exchange capacity (CEC) of the mineral and increases with the surface area. The polyacrylamide adsorption depends on the physico-chemical characteristics of the macromolecule, more particularly on the CONH2/COOratio, which determines the extent of the carbon chain, and the molecular weight. The accessibility of the organic macromolecule to the clay particle is controlled by the preceding factors. The quantity of polyacrylamide irreversibly adsorbed by clay minerals is important in the context of the use of the polymer on a petroleum field. It may be reduced to a minimum by working at low concentrations with a weakly hydrolyzed polyacrylamide solution.

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“…Ruehrwein and Ward [78] stated that the adsorption of anionic polymers onto clays occurs through ionic exchange. On the other hand, Michaels and Morelos [63] suggested that adsorption is mainly conditioned by hydrogen bonding. A third possibility would originate from the interaction between polyvalent cations acting as crosslinking agents between the clay negative surface and the anionic polymer [87].…”

Section: Clay Treated With Anionic Polymer and Dehydration (Hyper Clay)mentioning

confidence: 99%

“…VITO (Flanders Institute for Technologic Research) estimated the total amount of dredged sediment in Flanders (Belgium) at 7 million tons of dry matter per year [68]. Sediments may be treated to reduce the concentration of pollutants [62,63,73], but this approach can be cumbersome, not environmentally friendly, and expensive [72,84]. Most sediments are disposed in coastal and estuarine areas, which often form a Fig.…”

Section: Reuse Of Dredged Sediments Introductionmentioning

confidence: 99%

Modified clays for barriers: a review

Emidio

Verástegui-Flores

Mazzieri

et al. 2017

Innov. Infrastruct. Solut.

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The aim of this Specialized Lecture is to present the recent advances and issues, as well as original research, on Modified Clays for Barriers. Topics of interest include:(1) long-term hydraulic performance of modified clays for GCLs, (2) chemico-osmotic and diffusion efficiency of modified clays, (3) modeling coupled chemical-hydraulicmechanical behavior of modified clays, (4) wet and dry ageing of modified clays, (5) use of novel bentonites for vertical barrier applications, and (6) organoclays for various barrier applications. In addition, the possible reuse of dredged sediments after polymer treatment will also be discussed. Environmental management and handling of dredged sediments are important worldwide because enormous amounts of dredged material emerge from maintenance, construction and remedial works within water systems. Usually these materials after temporary upland disposal in lagoons are disposed in landfills. The aim of this study is to analyse the possible reuse of these sediments as a low-cost alternative material for landfill covers. The mechanisms through which polymers can improve the efficiency of dredged sediments for waste containment low permeable barriers are discussed.

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Polyelectrolyte Adsorption by Kaolinite

Cited by 238 publications

References 8 publications

Interactions of Clay Minerals with Organic Polymers. Some Practical Applications

Interactions of Clay Minerals with Organic Polymers. Some Practical Applications

Contribution to the Adsorption Mechanism of Acetamide and Polyacrylamide on to Clays

Modified clays for barriers: a review

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